混合气压力对爆震波特征参数的影响规律

A Study of the Law of Mixture Pressure Influence on the Characteristic Parameters of Detonation Wave

在混合气当量比一定的条件下,采用平衡常数法对烃-空气系统的爆震燃烧产物的平衡温度、平衡压力及爆震波速进行了计算及比较。在此基础上研究了混合气压力对爆震波特征参数的影响规律。结果表明:在同一当量比下,平衡温度和爆震波速随混合气压力变化规律一致,随着初始压力的增大而增大,逐渐趋于一最大值。平衡压力与初始压力呈线性增大。同时,对于不同燃料,分子量越大,其平衡温度、平衡压力就越大。

Under the conditions of constant mixture equivalence ratio, in this paper an equilibrium constant method is adopted in calculating and contrasting equilibrium temperature, equilibrium pressure and detonation wave velocity of hydrocarbon - air system detonation combustion products, and based on this a further study of the law of mixture's influence on the features of detonation wave's parameters is made. The result shows that, under a constant equivalent ratio, both the equilibrium temperature and the velocity of detonation wave all increase with the increase of mixture's initial pressure, and gradually tend to a certain maximum. The relationship between equilibrium pressure and initial pressure seems to be a liner increase. Meanwhile, for the different fuels, the more the molecule weight is, the higher the equilibrium temperature is, and the greater the equilibrium pressure is.