1.前言柴油机的燃烧对热效率以及对NOx和碳烟的排放量有重大影响。燃烧现象非常复杂,受燃油系统以及燃烧室内气体流动等多种因素影响,本文提出的燃烧室形状因素是其中最重要的因素之一。首先,燃烧室壁干扰燃油喷雾和周围气体的运动,因而影响油、气混合过程和燃烧过程。高速柴油机是采用各种燃烧室 1. Introduction Diesel combustion has a significant impact on thermal efficiency and on NOx and soot emissions. Combustion phenomenon is very complicated. Depending on various factors such as fuel system and gas flow in combustion chamber, the shape factor of combustion chamber proposed in this paper is one of the most important factors. First, the combustion chamber wall interferes with the fuel spray and the movement of the surrounding gas, thus affecting the mixing process of oil and gas and the combustion process. High-speed diesel engine is a variety of combustion chamber