叶片加工误差对压气机性能的影响

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 27 samples 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.