压气机动叶CLOCKING效应对叶片气动负荷的影响

Effect of rotor CLOCKING on blade aerodynamic load in compressor stages

摘要:

为研究某型燃气轮机中间三级轴流压气机第二级动叶片的CLOCKING效应及其对静叶片气动负荷的影响,采用基于谐函数(harmonic)的非定常计算方法对三级压气机进行数值模拟,分析流场尾迹输运以及叶片非定常气动负荷.计算结果表明,动叶片处于不同CLOCKING位置时,非定常流场具有截然不同的熵输运特点,因而在不同的气流激振力作用下各列叶片气动负荷差别较大.在CLK2位置上,静叶片气动力始终为正值,且波动幅值明显比其它位置小,气动力方向角波动范围最小,且气动力矩波动幅值和方向改变次数最少,具有最稳定的气动负荷.

Abstract:

The field of three stages in axial compressor for a gas turbine was simulated by the unsteady calculation method based on harmonics.The impact of CLOCKING effect of rotor blade in second stage on aerodynamic load of static blade in mid stage was investigated.By analyzing the wake transportation of flow field and the unsteady aerodynamic loads of the blades,the result shows that the different CLOCKING of R2 rotor blade corresponds to different entropy transportation characteristic,so the aerodynamic load discrepancy of each blade row is significantly obvious under different flow induced force.When at the CLK2 position,the aerodynamic force of static blade is always positive.In addition,its amplitude of fluctuation is smaller than that of the other location,the range of direction angle is also small,and the amplitude of fluctuation for aerodynamic torque and the changing number of direction are smaller than those of other locations,therefore the most stable aerodynamic load is obtained.