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工作状态的压气机转子叶片在气动力及离心力作用下会发生变形,准确的叶片构型预测对于压气机性能分析和检验具有重要意义。为研究叶片气弹变形对压气机气动及结构参数的影响,采用非线性叶型重构方法获得了Stage 37转子叶片在不同工况下的热态构型。在计算叶片变形时,计入了叶片受力载荷随构型变化的非线性特征以及叶片的变刚度特性,叶片受力载荷与刚度矩阵随叶片构型同步更新。考察了不同工况下热态叶片的变形规律,研究表明:叶型重构方法可有效提高压气机气动性能的预估精度。设计转速下,热态叶片的堵塞流量及近失速点压比较冷态叶片分别增加1.2%和0.24%,叶片变形对气动特性的影响随转速增加而增强。离心力对叶片变形起主要作用,然而气动力的压力反扭作用不可忽略,设计转速下近失速点反扭角较堵塞点增加了14.7%。计算跨声速转子热态叶片构型时,需考虑离心力和气动力的综合作用。
Working state of the compressor rotor blades in the aerodynamic and centrifugal force will be deformed, accurate prediction of the blade configuration for the compressor performance analysis and testing of great significance. In order to study the influence of the deformation of the blade on the aerodynamic and structural parameters of the compressor, the thermal configuration of the Stage 37 rotor blade under different operating conditions was obtained by the nonlinear leaf-type reconstruction method. In calculating the blade deformation, the non-linear characteristics of the blade force load with the configuration change and the variable stiffness characteristics of the blade are taken into account. The stress load and stiffness matrix of the blade are updated synchronously with the blade configuration. The deformation of the hot blades in different conditions was investigated. The results show that the leaf-type reconstruction method can effectively improve the prediction accuracy of the aerodynamic performance of the compressor. At design speed, the influence of blade deformation on the aerodynamic characteristics increased with the increase of rotational speed when the flow rate of the hot blade and the pressure drop of the near-stall point increased by 1.2% and 0.24% respectively. Centrifugal force plays a major role in the deformation of the blade. However, the anti-torsional effect of the aerodynamic force can not be neglected. The anti-twist angle of the near-stall point is 14.7% more than the blockage point at design speed. Calculation of transonic rotor hot blade configuration, the need to consider the combined effect of centrifugal force and aerodynamic force.