摘要
针对国内某大型企业不同机组离心压缩机叶轮叶片进行非定常流动数值分析,通过求解三维瞬态N-S方程组,得到流场分布和叶片表面的静压载荷信息。利用数值实验方法获得离心压缩机不同时序位置叶轮叶片表面动载荷的变化,并通过傅里叶变换得到叶轮叶片表面动载荷的分布特性,进而分析不同时序位置叶轮叶片表面气动负荷的差异。数值计算表明,时序效应对离心压缩机流道内流动以及叶轮叶片的非定常气动负荷存在不可忽略的影响,且合适的时序位置具有改进压缩机级性能的潜能。动载荷是压缩机叶轮叶片结构发生疲劳破坏的诱因,且不同机组离心压缩机中的时序效应对气动载荷的影响具有一致性。
By solving the three dimensional density-based Reynolds time-averaged N-S equations, the numerical simulations for the transient flow of impeller blade passages in different centrifugal compressor units are conducted. The distribution of internal flow and aerodynamic load on the impeller blade surfaces of different units is obtained. The dynamic load characteristics of impeller blade surfaces are transformed by Fourier transformation,ation and then the difference of the aerodynamic load on the impeller blade surfaces due to different clocking positions is analyzed. Numerical simulation results show that the clocking effect on the aerodynamic load cannot be ignored.Appropriate clocking positions have the potential to improve the performance of compressor stages. Meanwhile, the main reason for fatigue failure in compressor impellers is the aerodynamic load. The clocking effect on frequency characteristics from different units shows this consistently.
出处
《风机技术》
2016年第1期15-21,40,共8页
Chinese Journal of Turbomachinery
关键词
离心压缩机
时序效应
瞬态流动
数值模拟
气动负荷
叶片断裂
centrifugal compressor
clocking effect
transient flow
numerical simulation
aerodynamic load
blade damage
