叶片加工误差对压气机性能的影响

Effect of blade machining errors on compressor performance

在压气机三维动叶片结构参数中,叶型的前缘角、后缘角、前后缘形状、弦长、厚度、不同叶高位置这6个典型参数同时受加工误差影响,对压气机性能影响较大。为找出叶片加工误差对压气机性能的影响规律,对某跨声速压气机转子叶片的加工误差进行了研究,针对加工误差引起的上述6个典型结构参数变化,归纳出3个加工水平,并采用正交实验法设计出27个样本,通过数值计算对所有样本的性能进行对比分析。结果表明这6个典型结构参数的加工误差综合作用对压气机的总压比、效率、流量影响较大,增加的最大量分别为2.02%、1.47%、1.87%,减小的最大量分别为-0.87%、-1.42%、-0.88%,极差分析表明影响效率的主要参数为前缘角误差、厚度误差,影响总压比的主要参数为前后缘形状、厚度误差、不同叶高位置,影响流量的主要参数为前缘角误差、前后缘形状,回归线性分析证实压气机效率、流量的变化与上述典型参数的加工误差综合作用成线性关系。

Among three-dimensional compressor blade structure parameters,the leading edge angle,trailing edge angle,front and rear edge shape,chord length,thickness,and different span position of blade profile are affected by machining errors at the same time,which have great influence on compressor performance.In order to find out the influence of blade processing errors on compressor performance,the processing errors of a transonic compressor blade are studied.The variation of six typical structural parameters mentioned above caused by machining errors is summarized into three processing levels,and 27samples are designed by an orthogonal experiment method.The performance of all samples is compared and analyzed by numerical calculation.The results show that the combined effect of processing errors of these six typical structural parameters has a great influence on the total pressure ratio,efficiency and flow rate of compressor.The maximum increases are 2.02%,1.47%,1.87%,and the maximum decreases are-0.87%,-1.42%,-0.88%.Range analysis shows that the main parameters affecting efficiency are leading edge angle error and thickness error.The main parameters affecting total pressure ratio are leading edge shape,thickness error,and different span positions.The main parameters affecting flow rate are leading edge angle error and leading edge shape.Linear regression analysis confirms that the variation of compressor efficiency and flow rate are linearly related to the processing errors of the typical parameters mentioned above.