燃烧室结构对高强化柴油机性能的影响

The Influence of Combustion Chamber Structure on the Performance of Highly Intensified Diesel Engine

燃烧室结构的设计直接影响燃烧过程,从而影响其动力性、经济性。缩口直径是缩口型燃烧室的主要结构参数,在一台高强化柴油机上,对四种不同缩口直径的燃烧室的燃烧过程进行了仿真研究。结果表明:减小燃烧室缩口直径有助于增强缸内湍动能,促进油气混合,改善燃烧过程,提高柴油机的动力性。缩口直径减小后的燃烧室的指示功率均高于原机,其中G1燃烧室的指示功率提升最多,为1.81%。但缩口直径并非越小越好,缩口直径过小不利于燃烧中后期湍流的保持,影响混合燃烧。

The design of the combustion chamber structure directly affects the combustion process,thereby affecting its power and economy.The throat diameter is the main structural parameter of the throat combustor.A simulation study was carried out on the combustion process of four combustion chambers with different throat diameters on a highly Intensified diesel engine.The results show that reducing the diameter of the throat of the combustion chamber helps to enhance the turbulent kinetic energy in the cylinder,promote the mixing of oil and gas,improve the combustion process,and increase the power of the diesel engine.The indicated power of the combustion chamber after the reduced diameter of the throat is higher than that of the original machine,and the indicated power of the G1 combustion chamber is increased the most,1.81%.However,the diameter of the throat is not the less the better.If the throat diameter is too small,it is not conducive to the maintenance of turbulence in the middle and late stages of combustion and affects mixed combustion.