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在目前的叶轮机械中,普遍存在着旋转动叶与后置静叶干涉产生的非定常流动现象。这种流动现象会导致静叶表面产生非定常性压力脉动。这种脉动可分为旋转动叶的速度亏损尾迹引起的叶片表面的周期性脉动和气流本身的湍流脉动及其他涡团导致的随机脉动两个方面。采用一工业用单级通风机,对其动静叶的干涉现象进行研究。通过在后置静叶表面沿弦长及叶高方向布置动态压力传感器的方法,研究静叶的周向弯曲(倾斜)角度对静叶表面的非定常力的影响。研究结果表明:采用周向弯曲静叶会改变动叶尾迹所引起的后置静叶周期性脉动的幅值在静叶表面的分布特点,静叶顶部压力脉动的幅值与原始径向静叶相比能够有效地降低,同时与中部的压力幅值相比有一定提高,但整体呈现下降趋势;另一方面,静叶表面随机性的压力脉动强度受周向弯曲的影响较小。
In the current impeller machinery, there is a widespread unsteady flow phenomenon caused by the interference of the rotary vane with the rear vane. This flow phenomenon can cause unsteady pressure pulsations on the stator blade surface. This kind of pulsation can be divided into two parts: the periodic pulsation of the blade surface and the turbulent pulsation of the air flow caused by the wake of the rotating lobe and the random pulsation caused by other vortices. Using an industrial single-stage fan, the static and dynamic leaf interference phenomenon was studied. The influence of the static bending angle of the vane on the unsteady surface of the stator blade was studied by arranging the dynamic pressure sensor along the chord length and the blade height direction. The results show that using the circumferentially curved vane will change the amplitude distribution of the periodic fluctuation of the stationary vane caused by the wake of the rotor blade on the stationary vane surface. The amplitude of the pressure pulsation at the tip of the stationary vane is similar to that of the original radial stator Compared with the middle of the pressure amplitude of a certain increase, but the overall downward trend; the other hand, static random leaf surface pressure pulsation intensity by the circumferential bending less affected.