The Experts below are selected from a list of 1179 Experts worldwide ranked by ideXlab platform
G. Manavendra - One of the best experts on this subject based on the ideXlab platform.
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Effect of injection timing on modified direct injection diesel engine performance operated with dairy scum biodiesel and Bio-CNG
Renewable Energy, 2020Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The optimization of engine parameters, best nozzle hole and Piston Bowl geometry is highly marked for bio-fuel operation as they have slightly higher viscosity and lesser heating value than the petroleum diesel. In the first phase of work, at single fuel operation, study optimized the best fuel blend as B20 (among B10, B20, B30 and B100), injector opening pressure as 230 bar (among 210, 220, 230 and 240 bar), injection timing as 26. deg.bTDC (among 20, 23, 26 and 29. deg.bTDC), nozzle as 5 holes (among 3, 4 and 5 holes) and Piston Bowl geometry as re-entrant toroidal Piston Bowl geometry (among Hemispherical Piston Bowl geometry (HPBG), Straight sided Piston Bowl geometry (SSPBG), Toroidal Piston Bowl geometry (TPBG) and Re-entrant toroidal Piston Bowl geometry (RTPBG)). Hence, baseline engine is modified with all these optimized parameters and then modified engine is carried further for dual fuel experiments. In second phase of the work, study unfolds the effect of injection timing (IT) on dual fuelled (B20+Bio-CNG (enriched methane)) modified engine. From the dual fuelled engine study, it is revealed that 29. deg.bTDC IT has shown the improved performance, combustion and emission characteristics when compared to 20, 23, 26 and 32. deg.bTDC injection timings.
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Comparative study of standard engine and modified engine with different Piston Bowl geometries operated with B20 fuel blend
Renewable Energy, 2019Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The diesel engine parameters are more compatible with diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum biodiesel has higher viscosity and lesser heating value when compared to petroleum diesel. In the present study, nozzle hole (NH) geometry and engine parameters namely injector opening pressure (IOP), injection timing (IT), compression ratio (CR) are modified to appraise (optimize) the diesel engine performance. At the end optimized engine parameters (IOP: 230 bar, IT: 26 deg.bTDC, CR: 18, NH: 5 holes) are carried further to investigate the effect of Piston Bowl geometry on diesel engine performance operated with B20 (20% biodiesel+ 80% diesel) fuel blend. The experimental study revealed that the modified engine with Re-entrant Toroidal Piston Bowl Geometry (RTPBG) showed improved performance, combustion and emission characteristics when compared with standard engine (B20-SE) and modified engine (ME) with different Piston Bowl geometries, namely Hemispherical Piston Bowl Geometry (HPBG), Straight Sided Piston Bowl Geometry (SSPBG) and Toroidal Piston Bowl Geometry (TPBG). This improvement could be attributed to improved fuel atomization, smaller size droplets, increased cylinder temperature, swirl and squish, turbulent kinetic energy of the charge during combustion.
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comparative investigation of the effect of hemispherical and toroidal Piston Bowl geometries on diesel engine combustion characteristics
Biofuel Research Journal, 2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Diesel engine parameters are in general more compatible with operating on neat diesel than biodiesel and its blends. Therefore, optimizing operating conditions as well as Piston Bowl geometry to achieve a better performance with biodiesel in conventional diesel engines is highly essential. In the present study, hemispherical Piston Bowl geometry (HPBG) of existing diesel engine was modified into toroidal Piston Bowl geometry (TPBG) to evaluate the performance of a diesel engine running on a 20% blend of dairy scum oil biodiesel (B20). The experimental results revealed increased brake thermal efficiency and heat release rate by 5.5% and 17.24%, respectively, while brake specific fuel consumption, HC emission, and CO emission were decreased by 8.75%, 15%, and 14.47%, respectively, in response to the engine modification applied. Such improvements using the TPBG could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced squish-swirl, and turbulence kinetic energy during combustion. The findings of the present study could pave the way for the fabrication of diesel engines, which are more efficiently compatible with biodiesel and its blends.
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Effect of 5 hole nozzle and re-entrant toroidal Piston Bowl geometry on dairy scum biodiesel operated diesel engine
2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:The standard diesel engine parameters are well-suited with conventional diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum oil methyl ester (DSOME) has higher viscosity and lesser heating value when compared to petroleum diesel. In the present investigation standard engine Piston Bowl and nozzle hole geometry along with engine parameters (Injection pressure (IOP): 210, 220, 230 and 240 bar; Injection timing (IT): 23, 26 and 29.deg. bTDC; Compression ratio (CR): 16, 17 and 18) were modified to evaluate the diesel engine performance operated with optimized blend of DSOME-B20 among DSOME-B10, DSOME-B30 and DSOME-B100. From the experimental study it clears that modified engine with RTPBG (Re-entrant toroidal Piston Bowl geometry) had shown improved performance in comparison with HPBG-ME (Hemispherical Piston Bowl geometry-Modified engine) and DSOME-B20-SE (standard engine), which could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced swirl and squish (turbulent kinetic energy) during combustion.
Manjunath Channappagoudra - One of the best experts on this subject based on the ideXlab platform.
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Effect of injection timing on modified direct injection diesel engine performance operated with dairy scum biodiesel and Bio-CNG
Renewable Energy, 2020Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The optimization of engine parameters, best nozzle hole and Piston Bowl geometry is highly marked for bio-fuel operation as they have slightly higher viscosity and lesser heating value than the petroleum diesel. In the first phase of work, at single fuel operation, study optimized the best fuel blend as B20 (among B10, B20, B30 and B100), injector opening pressure as 230 bar (among 210, 220, 230 and 240 bar), injection timing as 26. deg.bTDC (among 20, 23, 26 and 29. deg.bTDC), nozzle as 5 holes (among 3, 4 and 5 holes) and Piston Bowl geometry as re-entrant toroidal Piston Bowl geometry (among Hemispherical Piston Bowl geometry (HPBG), Straight sided Piston Bowl geometry (SSPBG), Toroidal Piston Bowl geometry (TPBG) and Re-entrant toroidal Piston Bowl geometry (RTPBG)). Hence, baseline engine is modified with all these optimized parameters and then modified engine is carried further for dual fuel experiments. In second phase of the work, study unfolds the effect of injection timing (IT) on dual fuelled (B20+Bio-CNG (enriched methane)) modified engine. From the dual fuelled engine study, it is revealed that 29. deg.bTDC IT has shown the improved performance, combustion and emission characteristics when compared to 20, 23, 26 and 32. deg.bTDC injection timings.
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Comparative study of standard engine and modified engine with different Piston Bowl geometries operated with B20 fuel blend
Renewable Energy, 2019Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The diesel engine parameters are more compatible with diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum biodiesel has higher viscosity and lesser heating value when compared to petroleum diesel. In the present study, nozzle hole (NH) geometry and engine parameters namely injector opening pressure (IOP), injection timing (IT), compression ratio (CR) are modified to appraise (optimize) the diesel engine performance. At the end optimized engine parameters (IOP: 230 bar, IT: 26 deg.bTDC, CR: 18, NH: 5 holes) are carried further to investigate the effect of Piston Bowl geometry on diesel engine performance operated with B20 (20% biodiesel+ 80% diesel) fuel blend. The experimental study revealed that the modified engine with Re-entrant Toroidal Piston Bowl Geometry (RTPBG) showed improved performance, combustion and emission characteristics when compared with standard engine (B20-SE) and modified engine (ME) with different Piston Bowl geometries, namely Hemispherical Piston Bowl Geometry (HPBG), Straight Sided Piston Bowl Geometry (SSPBG) and Toroidal Piston Bowl Geometry (TPBG). This improvement could be attributed to improved fuel atomization, smaller size droplets, increased cylinder temperature, swirl and squish, turbulent kinetic energy of the charge during combustion.
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comparative investigation of the effect of hemispherical and toroidal Piston Bowl geometries on diesel engine combustion characteristics
Biofuel Research Journal, 2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Diesel engine parameters are in general more compatible with operating on neat diesel than biodiesel and its blends. Therefore, optimizing operating conditions as well as Piston Bowl geometry to achieve a better performance with biodiesel in conventional diesel engines is highly essential. In the present study, hemispherical Piston Bowl geometry (HPBG) of existing diesel engine was modified into toroidal Piston Bowl geometry (TPBG) to evaluate the performance of a diesel engine running on a 20% blend of dairy scum oil biodiesel (B20). The experimental results revealed increased brake thermal efficiency and heat release rate by 5.5% and 17.24%, respectively, while brake specific fuel consumption, HC emission, and CO emission were decreased by 8.75%, 15%, and 14.47%, respectively, in response to the engine modification applied. Such improvements using the TPBG could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced squish-swirl, and turbulence kinetic energy during combustion. The findings of the present study could pave the way for the fabrication of diesel engines, which are more efficiently compatible with biodiesel and its blends.
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Effect of 5 hole nozzle and re-entrant toroidal Piston Bowl geometry on dairy scum biodiesel operated diesel engine
2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:The standard diesel engine parameters are well-suited with conventional diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum oil methyl ester (DSOME) has higher viscosity and lesser heating value when compared to petroleum diesel. In the present investigation standard engine Piston Bowl and nozzle hole geometry along with engine parameters (Injection pressure (IOP): 210, 220, 230 and 240 bar; Injection timing (IT): 23, 26 and 29.deg. bTDC; Compression ratio (CR): 16, 17 and 18) were modified to evaluate the diesel engine performance operated with optimized blend of DSOME-B20 among DSOME-B10, DSOME-B30 and DSOME-B100. From the experimental study it clears that modified engine with RTPBG (Re-entrant toroidal Piston Bowl geometry) had shown improved performance in comparison with HPBG-ME (Hemispherical Piston Bowl geometry-Modified engine) and DSOME-B20-SE (standard engine), which could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced swirl and squish (turbulent kinetic energy) during combustion.
K. Ramesh - One of the best experts on this subject based on the ideXlab platform.
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Effect of injection timing on modified direct injection diesel engine performance operated with dairy scum biodiesel and Bio-CNG
Renewable Energy, 2020Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The optimization of engine parameters, best nozzle hole and Piston Bowl geometry is highly marked for bio-fuel operation as they have slightly higher viscosity and lesser heating value than the petroleum diesel. In the first phase of work, at single fuel operation, study optimized the best fuel blend as B20 (among B10, B20, B30 and B100), injector opening pressure as 230 bar (among 210, 220, 230 and 240 bar), injection timing as 26. deg.bTDC (among 20, 23, 26 and 29. deg.bTDC), nozzle as 5 holes (among 3, 4 and 5 holes) and Piston Bowl geometry as re-entrant toroidal Piston Bowl geometry (among Hemispherical Piston Bowl geometry (HPBG), Straight sided Piston Bowl geometry (SSPBG), Toroidal Piston Bowl geometry (TPBG) and Re-entrant toroidal Piston Bowl geometry (RTPBG)). Hence, baseline engine is modified with all these optimized parameters and then modified engine is carried further for dual fuel experiments. In second phase of the work, study unfolds the effect of injection timing (IT) on dual fuelled (B20+Bio-CNG (enriched methane)) modified engine. From the dual fuelled engine study, it is revealed that 29. deg.bTDC IT has shown the improved performance, combustion and emission characteristics when compared to 20, 23, 26 and 32. deg.bTDC injection timings.
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Comparative study of standard engine and modified engine with different Piston Bowl geometries operated with B20 fuel blend
Renewable Energy, 2019Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Abstract The diesel engine parameters are more compatible with diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum biodiesel has higher viscosity and lesser heating value when compared to petroleum diesel. In the present study, nozzle hole (NH) geometry and engine parameters namely injector opening pressure (IOP), injection timing (IT), compression ratio (CR) are modified to appraise (optimize) the diesel engine performance. At the end optimized engine parameters (IOP: 230 bar, IT: 26 deg.bTDC, CR: 18, NH: 5 holes) are carried further to investigate the effect of Piston Bowl geometry on diesel engine performance operated with B20 (20% biodiesel+ 80% diesel) fuel blend. The experimental study revealed that the modified engine with Re-entrant Toroidal Piston Bowl Geometry (RTPBG) showed improved performance, combustion and emission characteristics when compared with standard engine (B20-SE) and modified engine (ME) with different Piston Bowl geometries, namely Hemispherical Piston Bowl Geometry (HPBG), Straight Sided Piston Bowl Geometry (SSPBG) and Toroidal Piston Bowl Geometry (TPBG). This improvement could be attributed to improved fuel atomization, smaller size droplets, increased cylinder temperature, swirl and squish, turbulent kinetic energy of the charge during combustion.
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comparative investigation of the effect of hemispherical and toroidal Piston Bowl geometries on diesel engine combustion characteristics
Biofuel Research Journal, 2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:Diesel engine parameters are in general more compatible with operating on neat diesel than biodiesel and its blends. Therefore, optimizing operating conditions as well as Piston Bowl geometry to achieve a better performance with biodiesel in conventional diesel engines is highly essential. In the present study, hemispherical Piston Bowl geometry (HPBG) of existing diesel engine was modified into toroidal Piston Bowl geometry (TPBG) to evaluate the performance of a diesel engine running on a 20% blend of dairy scum oil biodiesel (B20). The experimental results revealed increased brake thermal efficiency and heat release rate by 5.5% and 17.24%, respectively, while brake specific fuel consumption, HC emission, and CO emission were decreased by 8.75%, 15%, and 14.47%, respectively, in response to the engine modification applied. Such improvements using the TPBG could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced squish-swirl, and turbulence kinetic energy during combustion. The findings of the present study could pave the way for the fabrication of diesel engines, which are more efficiently compatible with biodiesel and its blends.
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Effect of 5 hole nozzle and re-entrant toroidal Piston Bowl geometry on dairy scum biodiesel operated diesel engine
2018Co-Authors: Manjunath Channappagoudra, K. Ramesh, G. ManavendraAbstract:The standard diesel engine parameters are well-suited with conventional diesel fuel operation. However optimization of engine parameters for dairy scum biodiesel operation in diesel engine is highly pronounced as dairy scum oil methyl ester (DSOME) has higher viscosity and lesser heating value when compared to petroleum diesel. In the present investigation standard engine Piston Bowl and nozzle hole geometry along with engine parameters (Injection pressure (IOP): 210, 220, 230 and 240 bar; Injection timing (IT): 23, 26 and 29.deg. bTDC; Compression ratio (CR): 16, 17 and 18) were modified to evaluate the diesel engine performance operated with optimized blend of DSOME-B20 among DSOME-B10, DSOME-B30 and DSOME-B100. From the experimental study it clears that modified engine with RTPBG (Re-entrant toroidal Piston Bowl geometry) had shown improved performance in comparison with HPBG-ME (Hemispherical Piston Bowl geometry-Modified engine) and DSOME-B20-SE (standard engine), which could be attributed to improved fuel atomization, reduction of fuel droplet size, increased cylinder temperature, enhanced swirl and squish (turbulent kinetic energy) during combustion.
Rajesh Gupta - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of performance and emission characteristics of a diesel engine using split injection
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2020Co-Authors: Ankit Kesharwani, Rajesh GuptaAbstract:Society at large today is deeply concerned with environmental pollution which is primarily contributed by vehicular pollution. Diesel engines are mainly responsible for creating much of the air pollution. A large number of analyses have revealed numerous fuel alternatives with a view to mitigate emission, specially NOx and soot, and improve engine performance. This paper offers to explore the adequate balance between NOx and soot along with performance. The combined effect of split injection and Piston Bowl geometry on engine performance and emission has been investigated numerically. Numerical simulations were performed using three-dimensional AVL-FIRE commercial code on a single-cylinder DI Diesel engine taking standard diesel as fuel. Six different geometrical configurations of Piston Bowl along with three injection ratios were considered. The Piston Bowl geometry is modified by varying the depth and Bowl radius keeping Bowl volume, compression ratio, engine speed and mass injected invariant. It was noted that mass of fuel injected as pilot injection got mixed with the air, and the mixture became ready for burning prior to the occurrence of the main injection. In addition to this, the role of increasing the pilot injection mass up to 15% along with variation in Piston Bowl geometry on the in-cylinder mean pressure, temperature, rate of heat release and emission parameter is explored. Numerical data, computed for single injection, were validated against experimental results available in the literature. Further, an optimization study was undertaken for selected eighteen cases and results were evaluated for different injection ratios and Piston geometries. Piston Bowl geometry having 100 mm diameter and 2.48 mm depth and mass of fuel injected 5% in pilot and 95% in main injection (Case D4R1) was found to have optimum NOx and soot emission. The optimum NOx and soot were found to reduce by 10% and 16% by volume, respectively, as compared to those with single injection.
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Numerical analysis of flow dynamics for two Piston Bowl designs at different spray angles
Journal of Cleaner Production, 2017Co-Authors: Dinesh Kumar Soni, Rajesh GuptaAbstract:Abstract The main objective of the present study is to find the need of technology transformation from hemispherical Bowl Piston geometry to re-entrant Piston Bowl geometry. The two different Piston Bowl geometries were examined by the application of different spray angles. The NO and Soot emission characteristics for both geometries were measured and performance parameters were also evaluated to justify the use of geometry as a part of combustion study. A commercial CFD simulation software AVL FIRE was used to evaluate re-entrant and hemispherical Bowl Piston geometry. Easily available hemispherical Bowl Piston geometry of Kirloskar single cylinder diesel engine was used for comparison and validation purpose. The effect of spray angles such as 120°, 140° and 160° tested on both geometry, while comparison has drawn for emissions and performance parameters. Results indicated that, NO and Soot mass fraction of 120° and 160° spray angle is lowest respectively. Whereas, NO emissions are reduced to 66% at 120° spray angle in case of a Re-entrant Piston Bowl than hemispherical Bowl Piston geometry. However, the soot mass fraction shows same response for both geometry at 160° spray angle.
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numerical investigation of Piston Bowl geometry and swirl ratio on emission from diesel engines
Energy Conversion and Management, 2015Co-Authors: C Abdul P Gafoor, Rajesh GuptaAbstract:Abstract The present work investigates the effect of Piston Bowl geometry and initial swirl ratio on the engine performance and emission. The numerical simulation is carried out on a single cylinder diesel engine. Various configurations of Piston with a rectangular cavity and a wide range of initial swirl ratios are considered; variation in Bowl geometry is effected through a corresponding change in ratio of Bowl to Piston diameter ratio while maintaining the Bowl volume, compression ratio, engine speed and the mass of fuel injected constant. The predictions of this work reveal that high turbulent kinetic energy with a large swirl is crucial to enhance the quality of combustion. It is also found that variation in initial swirl affects in-cylinder pressure, temperature and the emission parameters more significantly for Piston geometries with high Bowl to Piston diameter ratio than with low diameter ratios. Further, an optimization is carried out on the large number of cases results obtained for various initial swirl and diameter ratios. The two cases with 70% diameter ratio and 0.5 initial swirl ratio and 55% diameter ratio and 2.5 initial swirl ratio are found to have optimum emission and performance characteristics.
Probir Kumar Bose - One of the best experts on this subject based on the ideXlab platform.
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The impact of combustion chamber configuration on combustion and emissions of a single cylinder diesel engine fuelled with soybean methyl ester blends with diesel
Renewable Energy, 2019Co-Authors: Shahanwaz Khan, Rajsekhar Panua, Probir Kumar BoseAbstract:Abstract The multi-dimensional computational fluid dynamics (CFD) simulation involving in-cylinder flow and combustion have been done to study the effect of soybean methyl ester and Piston Bowl configuration on performance, combustion and pollutant emissions from a single cylinder diesel engine. The baseline engine configuration consists of a hemispherical Piston Bowl. The investigation has been conducted for biodiesel blends with diesel and different Piston Bowl configurations such as Toroidal Re-entrant Combustion Chamber (TRCC), Re-entrant Combustion Chamber (RCC) and baseline Hemispherical Combustion Chamber (HCC) for same Bowl volume to have constant compression ratio of 17.5. To simulate the in-cylinder flow and combustion process, AVL FIRE code was performed and experimental results of baseline hemispherical Bowl have been used to validate the numerical model. The simulation results show that flow behaviour inside the combustion chamber strongly depends on the Piston Bowl configuration in diesel engine. The results obtained from the simulation for the fuel blends are compared with that of baseline diesel fuel. The brake specific fuel consumption is higher for biodiesel due to its lower heating value compared to baseline mineral diesel. However, significantly better results were obtained from engine having modified combustion chambers mainly due to better air movement and charge mixing.
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Combined effects of Piston Bowl geometry and spray pattern on mixing, combustion and emissions of a diesel engine: A numerical approach
Fuel, 2018Co-Authors: Shahanwaz Khan, Rajsekhar Panua, Probir Kumar BoseAbstract:Abstract In the present work the combine effects of spray angle and the Piston Bowl geometry on mixing, combustion and emission characteristics of a direct injection diesel engine have been analyzed numerically. The Piston Bowl geometry is one of the most important factor that affect the air fuel mixing and combustion and emissions in a direct injection diesel engine. Four spray angles 150°, 155°, 160° and 165° and three different Piston Bowl geometries namely Toroidal Re-entrant Combustion Chamber (TRCC), Toroidal Combustion Chamber (TCC) and the baseline Hemispherical Combustion Chamber (HCC) have been considered for the same compression ratio of 17.5 and with same chamber volume for all three cases. To simulate the in-cylinder flow and combustion computational fluid dynamics (CFD) modeling based AVL FIRE code was performed and experimental results of the baseline hemispherical Bowl were used to validate the numerical model. Simulation results show that spray angle significantly affects the mixing and combustion process for all three Bowl geometries and the engine having TRCC type of combustion chamber gives better performance.