某矿下高功率密度柴油机燃烧室参数的优化研究

Optimization Study of Combustion Chamber Parameters for High Power Density Diesel Engine under Mine

以高功率密度柴油机为研究对象,采用AVL FIRE三维软件进行仿真的方法,建立了3种尺寸参数不同的燃烧室,研究了不同缩口比和径深比对高功率密度柴油机在气流运动、动力性能以及排放性能的影响规律。结果显示表明,燃烧室形状主要通过影响气流分布来影响燃烧排放性能,将缩口比由0.8减少到0.6,径深比从3.73减少到2.07,提高了湍动能强度,减少了燃油消耗,指示功率相对增加,NO排放减少,炭烟排放大幅度降低,对该型高功率密度柴油机而言,所设计的I型燃烧室尺寸较为合理。

Using high power density diesel engine as the research object and adopting the method of three-dimensional simulation software—AVL FIRE, three different combustion chamber was set up,different diameter ratio and diameter-depth ratio was studied on high power density diesel engine in air movement, dynamic performance and the influencing of emission performance. The result shows that the shape of the combustion chamber by mainly influencing the distribution of air flow to affect the combustion and emission performance, Reducing reducing ratio from 0.8 to 0.6, diameter depth ratio decreased from 3.73 to 2.07, It increased the strength of the turbulent kinetic energy, reduced the fuel consumption and indicated power relative increased, NO and soot emissions greatly reduced. For the high power diesel engine, design of I type combustion chamber is more reasonable.