通过对2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室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，燃烧类型也有很大影响。对于以碳氢化合物为燃料，化学反应控制类型燃烧室模化中N值相对较大，大致范围为1.6～2.0。当燃烧过程受扩散控制时， N值相对较小，大致范围为1.0～1.4。

The effect of combustion process on the pressure exponent N in gas turbine combustor efficiency similitude study is investigated by numerical simulation. It is suggested that for hydrocarbon fuel, the pressure exponent N may be selected as 1.6〜2.0 when the combustion process is reaction-controlled. When the combustion process is diffusion controlled it may be selected as 1.0〜1.4. The result of this paper would be useful for the modeling test of gas turbine combustor.