汽车燃料的化学计量空燃比

[中文适用范围]： 燃烧单位质量的燃料而没有过量的氧气或剩余燃料所需的空气质量被称为化学计量空燃比。该比率在可考虑用于汽车发动机的多种燃料（汽油@柴油燃料@和替代燃料）中存在显着变化。虽然使用不同燃料运行的发动机的性能可以在相同空燃比或相同燃料空气比@下进行比较，但比较在相同当量比@下的运行更为合适，因为化学计量空燃比的知识是最重要的。前提条件。本 SAE 推荐实践总结了根据空气成分和燃料元素成分的知识来计算化学计量空燃比，无需任何有关燃料分子量的信息。 [外文原描述]： The mass of air required to burn a unit mass of fuel with no excess of oxygen or fuel left over is known as the stoichiometric air-fuel ratio. This ratio varies appreciably over the wide range of fuels - gasolines, diesel fuels, and alternative fuels - that might be considered for use in automotive engines.Although performance of engines operating on different fuels may be compared at the same air-fuel ratio or same fuel-air ratio, it is more appropriate to compare operation at the same equivalence ratio, for which a knowledge of stoichiometric air-fuel ratio is a prerequisite.This SAE Recommended Practice summarizes the computation of stoichiometric air-fuel ratios from a knowledge of a composition of air and the elemental composition of the fuel without a need for any information on the molecular weight of the fuel.Cross Reference: 2010-01-2112