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1.2 汽油机燃烧过程的若干问题1.2.1 混合气成份及其表示方法前面已经说过,发动机借以对外作功的机械能是由气缸内燃料燃烧发出的热量转化而来的。这个热量的多少,决定于每一工作循环进入发动机气缸中的空气量和燃料量以及它们的燃烧情况。通常用空燃比(A/F)来表示燃烧时空气量和燃料量之比,,也有用过量空气系数(a)来表示混合气成份或浓度的。在理论上,使一定量的燃料完全燃烧所需的空气量称为理论空气量。它是按照燃料完全
1.2 Some problems with the combustion process of a gasoline engine 1.2.1 The composition of a mixed gas and its representation method As mentioned earlier, the mechanical energy that the engine uses to work externally is converted from the heat emitted by the fuel combustion in the cylinder. The amount of heat depends on the amount of air and fuel entering the engine cylinder for each duty cycle and their combustion. Air-fuel ratio (A / F) is usually used to represent the air-fuel ratio at combustion and the fuel ratio, and the excess air ratio (a) is also used to indicate the composition or concentration of the gas mixture. In theory, the amount of air required to completely burn a given amount of fuel is called the theoretical air amount. It is according to the fuel completely