用数值计算方法对出口温度与压力指数关系的研究

Numerical Study of the Relationship between Pressure Exponent n and Combustor Exit Temperature

通过对两种不同类型的燃气轮机燃烧室的数值计算 ,研究了不同燃烧类型对燃气轮机燃烧效率模化试验中压力指数选取的影响 ,结果表明压力指数除受到燃料、余气系数等影响之外 ,燃烧类型对其也有很大影响。对于以碳氢化合物为燃料 ,化学动力学控制类型燃烧室模化中 n值相对较大 ,范围为 1 .6～ 2 .0。当燃烧过程受扩散火焰控制时 ,n值相对较小 ,范围为 1 .0～ 1 .

By numerical simulation of two different gas turbine combustors, the selection of pressure exponent n in combustion efficiency simulation test was investigated. It is suggested that for hydrocarbon fuel, the pressure exponent n may be selected in the range of 1.6-2.0, when the combustion process is reaction-controlled. When the combustion process is diffusion-controlled, the range of 1.0-1.4 is suggested. The result is useful for the model test of gas turbine combustors.