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Mickevičius Tomas - One of the best experts on this subject based on the ideXlab platform.
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio inžinerijos fakulteta
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio akademij
Labeckas Gvidonas - One of the best experts on this subject based on the ideXlab platform.
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio inžinerijos fakulteta
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio akademij
Slavinskas Stasys - One of the best experts on this subject based on the ideXlab platform.
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio inžinerijos fakulteta
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Numerical Study on the effects of control valve leakage on CR injector performance
'Lutsknational Technical University', 2021Co-Authors: Labeckas Gvidonas, Slavinskas Stasys, Mickevičius TomasAbstract:The paper presents the results of numerical inveStigation of the effects of the control valve leakage on the performance of Common Rail (CR) injector. A numerical model of a CR injector 1-St Generation was developed in AVL BOOSt Hydsim environment to achieve the research tasks. It is revealed that the control valve leakage has the biggeSt effect on pressure changing behaviour in the control chamber and, in turn, on the amount of fuel injected per cycle. The amount of fuel injected increases with the increase in the control valve leakage. The effect of the control valve leakage is higher the higher rail pressure and the shorter the duration of fuel injection. Pressure in the control chamber drops dawn to the minimum value earlier after the Start of opening the control valve and rises to the maximum value later in the cycle when the control valve closes the outlet orifice as the fuel leakage from the control chamber increases. When the control valve leakage increases, the nozzle needle-valve rises earlier and descends back to the seat later in the cycleVytauto Didžiojo universitetasŽemės ūkio akademij
Abdul Waheed Bhutto - One of the best experts on this subject based on the ideXlab platform.
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perspectives for the production of ethanol from lignocellulosic feedStock a case Study
Journal of Cleaner Production, 2015Co-Authors: Abdul Waheed Bhutto, Khanji Harijan, Khadija Qureshi, Aqeel Ahmed Bazmi, Alireza BahadoriAbstract:AbStract PakiStan has limited indigenous resources of fossil fuel and the deficit is being filled through imports of crude oil and petroleum product. The country presently produces bio ethanol predominantly from molasses, a byproduct of the refining of sugarcane. Since promotion of 1 St -Generation biofuels appears unsuStainable because of the potential Stress on food commodities, crop residues present a major opportunity for cleaner production through promotion of 2nd Generation bio ethanol. Based on the evaluation of the availability of lignocellulosic biomass in PakiStan, this Study forecaSts the annual yield of five lignocellulosic feedStocks i.e. cotton Stalks, sugarcane tops, rice Straw, maize Stalks and wheat Straw from 2013 to 2030 in PakiStan with the help of Adaptive Neuro Fuzzy Interface SyStem Model. Based on the availability of biomass feedStock, the Study forecaSts the maximum theoretical potential for production of bio ethanol from these crop residues up to 2030. Our Study also analyses the parameters affecting the basic price for the crop residue collection.
Antti Tourunen - One of the best experts on this subject based on the ideXlab platform.
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development of 2nd Generation oxyfuel cfb technology small scale combuStion experiments and model development under high oxygen concentrations
Energy Procedia, 2014Co-Authors: Toni Pikkarainen, Jaakko Saastamoinen, Heidi Saastamoinen, Timo Leino, Antti TourunenAbstract:AbStract The 1 St Generation oxyfuel CFB (Circulating Fluidised Bed) technology has been demonStrated up to 30MW th scale and the commercial concept for 300 MW e air/oxy flexible CFB power plant is available. Currently, the development of 2 nd Generation oxyfuel CFB technology is ongoing aiming to reduce significantly – around 50% – the overall efficiency penalty of CO 2 capture in power plants compared to 1 St Generation concepts. The 2 nd Generation oxyfuel CFB plants are designed only to oxyfuel operation with CCS. The experimental results of the teSt campaigns with 0.1 MW th pilot scale CFB unit and laboratory scale BFB (Bubbling Fluidised Bed) unit under high oxygen concentrations of feed gas are presented. The pilot scale teSts were carried out with Spanish anthracite and petroleum coke mixture and with Polish bituminous coal. Two Spanish limeStone types were used for in- furnace sulphur capture. TeSt matrix of pilot scale CFB unit contained 11 teSt balances with varying feed gas O 2 concentrations (between 21…42 vol-%) and O 2 Staging to primary and secondary gas feeds (primary gas O 2 share 50…80 vol-%) at different bed temperature levels (820…920 °C). CombuStion performance and emission formation was Studied at air combuStion and varying oxyfuel combuStion conditions. The fuel impulse teSts with laboratory scale BFB included 16 teSts with Spanish anthracite and Polish bituminous coal in varying feed gas O2 concentrations (5…50 vol-%) with two fuel size fractions (0.5-2.0 mm and 4.0-8.0 mm) at conStant bed temperature level (850 °C). The main objective was Study how high O 2 concentration effects on char reactivity and formation of nitrogen oxide emissions. A one dimensional model for laboratory scale BFB was used to further develop exiSting sub-models’ descriptions and parameters in the one dimensional model (1D-model) for pilot scale CFB in order to improve modelling capabilities in oxygen combuStion conditions. FirStly the sub-models’ equations for different phenomenon – e.g. pyrolysis, char combuStion and reactions of nitrogen species – were implemented and validated with bench scale experimental data. Secondly, the sub-model parameters found in bench scale modelling for char reactivity and NO x formation were implemented to the 1D-model of pilot scale CFB combuStor. According to the results of the validation modelling againSt pilot scale experimental results, the combuStion was successfully scaled up as the modelled temperature profiles and flue gas oxygen contents were well in line with measurements. Anyhow, further validation of the combuStion model is needed by modelling of dynamic responses of pilot scale experiments. The pilot scale 1D-model was not able to predict NO x formation with the sub-model adapted from the bench scale model. Further model development and experimental work are needed with different particle size fractions at different operating conditions. The improved modelling capabilities under high oxygen concentrations can be utilized in the development and designing of 2 nd Generation oxyfuel CFB power plant concepts. Generally, the CFB technology appears to be ideally suited to oxyfuel combuStion. The flexibility of the fluid-bed process offers an outStanding benefit for CFB in retaining uniform furnace temperature profiles, metal temperatures and local heat production rates in air-firing as well as in oxygen-firing and under varying load conditions. These benefits make also possible to apply higher oxygen concentrations which is a key element in the 2 nd Generation high efficiency oxyfuel CFB concepts.