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首页> 外文会议>SAE World congress;Multi-dimensional engine modeling session >Analysis of the Effect of Re-Entrant Combustion Chamber Geometry on Combustion Process and Emission Formation in a HSDI Diesel Engine
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Analysis of the Effect of Re-Entrant Combustion Chamber Geometry on Combustion Process and Emission Formation in a HSDI Diesel Engine

机译：再入式燃烧室几何形状对HSDI柴油机燃烧过程和排放形成的影响分析

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An investigation has been carried out to examine the influence of re-entrant combustion chamber geometry on mixture preparation, combustion process and engine performance in a high-speed direct injection (HSDI) four valves 2.0L Ford diesel engine by CFD modeling. The computed cylinder pressure, heat release rate and soot and NOx emissions were firstly compared with experimental data and good agreement between the predicted and experimental values was ensured the accuracy of the numerical predictions collected with the present work. Three ITs (Injection Timing) at 2.65° BTDC, 0.65° BTDC and 1.35° ATDC, all with 30 crank angle pilot separations were also considered to identify the optimum IT for achieving the minimum amount of pollutant emissions. In order to investigate the effect of combustion chamber, thirteen different types of combustion chamber configurations have been considered based on four categories including piston bowl depth, piston bowl width, piston bottom surface and lip area. For all the studied cases, compression ratio, squish bowl volume and the amount of injected fuel were kept constant to avoid that the effects of changes in chamber geometry be masked by the effect of other engine parameters. The results confirmed that the combustion chamber geometry has significant effects on the combustion process. It showed that by changing the design of the piston crown, the amount of emission pollutants can be decreased while the other performance parameters of engine remain constant.
机译：通过CFD建模，已经进行了调查，以检验折返式燃烧室的几何形状对高速直喷（HSDI）四气门2.0升福特柴油发动机的混合气制备，燃烧过程和发动机性能的影响。首先将计算出的气缸压力，放热率以及烟灰和NOx排放与实验数据进行比较，并且预测值与实验值之间的良好一致性确保了本工作收集的数值预测的准确性。还考虑了在3.65°BTDC，0.65°BTDC和1.35°ATDC处的三个IT（喷射正时），它们都具有30个曲轴转角引燃间隔，以识别实现最小污染物排放量的最佳IT。为了研究燃烧室的效果，已根据四种类型考虑了十三种不同类型的燃烧室配置，包括活塞碗深度，活塞碗宽度，活塞底表面和唇缘面积。对于所有研究的情况，压缩比，压碗容积和喷射的燃料量保持恒定，以避免舱室几何形状变化的影响被其他发动机参数的影响所掩盖。结果证实，燃烧室的几何形状对燃烧过程具有显着影响。结果表明，通过改变活塞顶的设计，可以减少排放污染物的数量，同时发动机的其他性能参数保持不变。

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