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本文介绍了在平面振荡叶栅实验台上对一组透平叶片进行非定常气动性能研究的方法和结果。叶片的振型为扭转振动,频率为1(Hz),振幅为2°,风洞出口气流速度为33(m/s)。实验研究了来流冲角和叶片间的振动相位差对振荡叶栅非定常气动性能的影响。实验测量了不同工况下的叶片表面的振荡压力分布,并用二维热线风速仪测量了叶栅流道內的振荡速度场。在此基础上对振荡叶栅的稳定性进行分析。结果表明:1)不论叶片振动是否简谐,振荡压力的主频分量居绝对支配地位;2)叶片间的振动相位差和来流冲角对振荡叶栅的稳定性均有较大影响。
This paper introduces the method and result of unsteady aerodynamic performance of a group of turbine blades on a planar oscillating cascade. The vibration mode of the blade is torsional vibration, the frequency is 1 (Hz), the amplitude is 2 °, and the airflow velocity at the exit of wind tunnel is 33 (m / s). The influence of the flow angle and the phase difference between the vanes on the unsteady aerodynamic performance of the oscillating cascade was studied experimentally. The oscillation pressure distribution on the blade surface under different working conditions was measured experimentally, and the oscillation velocity field in the cascade flow passage was measured by two-dimensional hot-wire anemometer. On this basis, the stability of the oscillating cascade is analyzed. The results show that: 1) the dominant frequency component of the oscillation pressure is in absolute dominance, regardless of whether the vibration of the blade is harmonic or not; 2) the phase difference between the vanes and the flow angle of attack have a great influence on the stability of the oscillating cascade.