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为了能用数值计算方式模拟动态总压畸变对航空发动机稳定性的影响,首先要模拟出进口总压的随机脉动过程.根据进口总压随机脉动的正态分布特点及相关性特征,获得了带有指数自相关函数的动态总压畸变的随机过程,同时分析了积分时间常数、时间步长以及时间长度等参数对所生成的总压随机脉动过程的影响.结果表明,为了获得较好的模拟效果,时间步长应取得较小,时间长度应取得足够的长,而积分时间常数对模拟的可靠性则影响不大.
In order to simulate the effect of dynamic total pressure distortion on aeroengine stability numerically, we first simulate the random pulsation process of the total inlet pressure.According to the normal distribution characteristics and correlation characteristics of the random pulsation of the imported total pressure, The random process of dynamic total pressure distortion with exponential autocorrelation function and the influence of integral time constant, time step and time length on the generated total pressure stochastic pulsation process are analyzed.The results show that in order to obtain better simulation Effect, the time step should be made smaller, the length of time should be made long enough, and the integral time constant has little effect on the reliability of the simulation.