The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Qian Cong - One of the best experts on this subject based on the ideXlab platform.
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effects of cylindrical pit array on tribological property of piston cylinder sleeve friction pair in a bw 250 slime pump
Tribology International, 2020Co-Authors: Tianyu Gao, Hong Zhang, Qian CongAbstract:Abstract This study designed a bio-inspired piston with a cylindrical pit array according to the BW-250 slime pump piston based on the surface structure of earthworm and leech. The friction was tested and analyzed. The friction pair mechanic system was modeled for finite element analysis, and the oil film test was supplemented. Results demonstrate that the bio-inspired piston show a lower friction force than the standard piston and a drag reduction rate that is above 10%. Cylindrical pit array can reduce the flow velocity of lubricating oil and increase the oil film pressure. The length and thickness of the oil film over the bio-inspired piston are higher than those of standard Pistons.
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wear performance of bionic dimpled shape Pistons of mud pump
Advances in Materials Science and Engineering, 2017Co-Authors: Xuejing Cheng, Shaofeng Ru, Qian CongAbstract:The piston is one of the parts that most easily become worn out and experience failure in mud pumps for well drilling. By imitating the body surface morphology of the dung beetle, this paper proposed a new type (BW-160) of mud pump piston that had a dimpled shape in the regular layout on the piston leather cup surface and carried out a performance test on the self-built test rig. Firstly, the influence of different dimple diameters on the service life of the piston was analyzed. Secondly, the analysis of the influence of the dimple central included angle on the service life of the piston under the same dimple area density was obtained. Thirdly, the wear of the new type of piston under the same wear time was analyzed. The experimental results indicated that the service life of the piston with dimples on the surface was longer than that of L-Standard Pistons, and the maximum increase in the value of service life was 92.06%. Finally, the Workbench module of the software ANSYS was used to discuss the wear-resisting mechanism of the new type of piston.
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wear performance of bionic strip shaped mud pump Pistons
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2017Co-Authors: X J Cheng, S F Ru, Qian CongAbstract:The service life of mud pump Pistons may be extended by imitating the body surface morphology of earthworms. To achieve this solution, bionic strip structures of various sizes are processed on the working surface of a BW-160 mud pump piston. The service lives of standard and bionic Pistons are compared under experimental conditions. Results show that the bionic strip structure clearly improves the service life of mud pump Pistons. The influence of the width of a bionic piston strip is greater than that of strip spacing. The bionic strip should not be too small or large because size could have negligible or deleterious effects on service life, respectively. The optimal structure parameters of a bionic strip piston when the optimal contact area between the piston and the cylinder liner is 73.5% are a strip width of 3 mm, strip spacing of 3 mm, and strip number of 3. These parameters improve piston service life by 81.5%. Finite element analysis simulations of wear demonstrate that the bionic strip can change...
Muhammet Cerit - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis of a ceramic coating diesel engine piston using 3 d finite element method
Surface & Coatings Technology, 2007Co-Authors: Ekrem Buyukkaya, Muhammet CeritAbstract:Abstract In this study, firstly, thermal analyses are investigated on a conventional (uncoated) diesel piston, made of aluminum silicon alloy and steel. Secondly, thermal analyses are performed on Pistons, coated with MgO–ZrO2 material by means of using a commercial code, namely ANSYS. Finally, the results of four different Pistons are compared with each other. The effects of coatings on the thermal behaviors of the Pistons are investigated. It has been shown that the maximum surface temperature of the coated piston with material which has low thermal conductivity is improved approximately 48% for the AlSi alloy and 35% for the steel.
James D Van De Ven - One of the best experts on this subject based on the ideXlab platform.
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Mobile hydraulic power supply: Liquid piston Stirling engine pump
Renewable Energy, 2009Co-Authors: James D Van De VenAbstract:Conventional mobile hydraulic power supplies involve numerous kinematic connections and are limited by the efficiency, noise, and emissions of internal combustion engines. The Stirling cycle possesses numerous benefits such as the ability to operate from any heat source, quiet operation, and high theoretical efficiency. The Stirling engine has seen limited success due to poor heat transfer in the working chambers, difficulty sealing low-molecular weight gases at high pressure, and non-ideal piston displacement profiles. As a solution to these limitations, a liquid piston Stirling engine pump is proposed. The liquid Pistons conform to irregular volumes, allowing increased heat transfer through geometry features on the interior of the working chambers. Creating near-isothermal operation eliminates the costly external heat exchangers and increases the engine efficiency through decreasing the engine dead space. The liquid Pistons provide a positive gas seal and thermal transport to the working chambers. Controlling the flow of the liquid Pistons with valves enables matching the ideal Stirling cycle and creates a direct hydraulic power supply. Using liquid hydrogen as a fuel source allows cooling the compression side of the engine before expanded the fuel into a gas and combusting it to heat the expansion side of the engine. Cooling the compression side not only increases the engine power, but also significantly increases the potential thermal efficiency of the engine. A high efficiency Stirling engine makes energy regeneration through reversing the Stirling cycle practical. When used for regeneration, the captured energy can be stored in thermal batteries, such as a molten salt. The liquid piston Stirling engine pump requires further research in numerous areas such as understanding the behavior of the liquid Pistons, modeling and optimization of a full engine pump, and careful selection of materials for the extreme operating temperatures. Addressing these obtainable research quandaries will enable a transformative Stirling engine pump with the potential to excel in numerous applications.
Krishnamoorthi Muniappan - One of the best experts on this subject based on the ideXlab platform.
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The influence of ceramic-coated piston crown, exhaust gas recirculation, compression ratio and engine load on the performance and emission behavior of kapok oil–diesel blend operated diesel engine in comparison with thermal analysis
Environmental Science and Pollution Research, 2019Co-Authors: Shreeram Bakthavathsalam, Rajendran Irusa Gounder, Krishnamoorthi MuniappanAbstract:In this work, the development and usability of kapok oil in diesel engine was intended. With this purpose, the piston crowns are coated with mullite–lanthanum (ML) ceramic composite at varying compositions in order to reduce the heat rejection during combustion process. The kapok oil is blended with diesel fuel consisting of (20% kapok oil–80% diesel) volumetrically named B fuel. The B and diesel (D) fuels are taken for the engine performance test with different coated piston (ML1, ML2, and ML3) and exhaust gas recirculation (EGR—10%, 20%, and 30%), compression ratio (CR—16, 17, and 18) and engine load (50%, 75%, and 100%). Also, the engine performance study on brake thermal efficiency (BTE), brake-specific fuel consumption (BSFC), hydrocarbons (HCs), oxides of nitrogen (NOx), carbon monoxide (CO), smoke opacity, and numerical study using ANSYS software is carried out. When operated with ML2-coated Pistons with B fuel, maximum BTE value of 29.2%, minimum BSFC value of 0.224 kg/kW-h, CO emission of 0.2%, and smoke opacity of 39 ppm were observed. The results showed that ML2-coated piston considerably improved the performance of the test engines when compared with ML1 and ML3 coatings. Except for NOx emission, all other pollutant emission values were reduced. The numerical analysis using ANSYS software for ML2-coated Pistons showed better retention of in-cylinder chamber temperature.
Xianghua Zhai - One of the best experts on this subject based on the ideXlab platform.
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casimir Pistons with hybrid boundary conditions
Physical Review D, 2007Co-Authors: Xianghua ZhaiAbstract:The Casimir effect giving rise to an attractive or repulsive force between the configuration boundaries that confine the massless scalar field is reexamined for one- to three-dimensional Pistons in this paper. Especially, we consider Casimir Pistons with hybrid boundary conditions, where the boundary condition on the piston is Neumann and those on other surfaces are Dirichlet. We show that the Casimir force on the piston is always repulsive, in contrast with the same problem where the boundary conditions are Dirichlet on all surfaces.
