某多级压气机畸变传递过程中相关参数影响研究

进口畸变是诱发航空压气机内部流动失稳的关键因素,极大地限制了压气机的性能及稳定运行范围.在畸变条件下采用数值模拟及模型分析相结合的方法,建立了一个模型,以某型三级压气机为研究对象,研究畸变传递过程中相关参数影响,计算了畸变强度和畸变范围沿压气机轴向的分布情况.结果表明在进口总压畸变相同的条件下,转速越小,压气机出口畸变强度越小,出口总压分布相对较均匀,出口畸变范围也越小;总压总温畸变,进口畸变范围越大,压气机出口畸变强度越大.不论是总压畸变还是总温畸变,对于该三级压气机,径向畸变的衰减程度比周向畸变衰减程度大.

Research on the Transfer Characteristic of Multi-stage Compressors to the Distortion of the Relative Parameters

The inlet distortion is a key factor of causing inner flowing unsteady of engine compressor and it greatly limits the capability and the steady range of compressor. The method of uniting numerical simulation with model analysis is adopted in the condition of distortion and a model is established which is used to calculate the transfer characteristic of the inlet distortion in the compressor. The influence of relative parameter of distortion transfer process is studied according to a third class compressor, and the axial distributing instance of the intensity and the range of distortion is calculated. The simulation result shows that the smaller the rotating speed, the weaker the export intensity of distortion of compressor; the export total pressure is distributed uniformly, and the export range of distortion is smaller under the same condition of distortion pattern. For the total pressure and total temperature distortion, the bigger the inlet range of distortion, the stronger the export intensity of distortion of compressor is. Without reference to total pressure or total temperature distortion, the radial attenuation of distortion is stronger than the circumferential attenuation of distortion for the third class compressor.