轴流压缩系统对非定常扰动响应的新模型

A NEW MODEL FOR PREDICTING UNSTEADY RESPONSE OF AXIAL COMPRESSION SYSTEM

对进口非定常扰动条件下多级轴流压气机动态响应及气动稳定性进行了详细的数值分析。采用了目前广泛使用的逐级模型。基于逐级特性，建立了该模型中叶片力和轴功的准定常计算方法并导出了基于特征线和ＭａｃＣｏｒｍａｃｋ二步差分相结合的数值计算方法。应用本模型对两个多级轴流压缩系统算例进行了数值预测，其结果与实验结果一致性较好，表明了本文新模型是可行的。

A theoretical model is established for predicting the dynamic response and the aerodynamic stability in a multistage axial compression system under inlet dynamic temperature and pressure disturbances.A new method is provided for determining the force of compressor blading and the rate of shaft work.The effects of the unsteady inlet temperatures and pressures on the dynamic response of two multistage axial-flow compressors have been studied theoretically.The numerical method for the presented model is given based on the method of characteristics and MacCormack's finite difference scheme,and the numerical examples of the two multistage axial compressors are given based on the stage-by-stage compressor characteristics.The numerical simulation with the authors′ model and method gives results in fairly good agreement with available experimental data.Both tests and numerical simulation show that the rise in the compressor inlet total temperature is nearly proportional to the inlet dynamic temperature disturbance,and the dyanmic pressure responses inside the multistage axial compressors can be predicted accurately.Finally,the flow instability occurred in the first stage has been found by using this model.