进口状态对燃烧室压力损失影响试验研究

Test Study on the Effect of Inlet Condition on Pressure Loss in Combustion Chamber

航空发动机燃烧室的压力损失特性对发动机整机性能有着重要影响。为了解燃烧室进口气流参数对流动阻力的影响规律,对3头部矩形燃烧室进行吹风试验,研究了不同燃烧室进口气流速度、压力、温度及燃烧状态对总压损失的影响。试验结果表明:燃烧室总压损失系数与进口马赫数的平方成正比关系;进口气流的温度、压力对流动阻力特性基本无影响;燃烧室总压损失系数随着油气比的增大而增大。

The pressure loss characteristic of the aeroengine combustion chamber has an important influence on the performance of the whole engine.In order to understand the influence of the inlet air flow parameters on the flow resistance of the combustion chamber,the air-blowing test was carried out for the rectangular combustion chamber with triple swirlers.The influence of inlet air flow velocity,pressure,temperature and combustion state on total pressure loss in different combustion chambers were studied.The test results show that the total pressure loss coefficient of the combustion chamber is proportional to the square of the inlet Mach number.The temperature and pressure of inlet air flow have little influence on the flow resistance characteristics,and the total pressure loss coefficient of combustion chamber increases with the increase of fuel-air ratio.