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采用数值方法对设计流量为1.15 kg/s,转速为60 kr/min的一级轴流和离心叶轮组成的组合压气机非定常流场进行模拟,目的是明确多排叶栅压气机中静叶尾迹形态和流动特性,找出影响静叶尾迹非定常流动的主要因素,并探讨干涉频率和动叶时序位置对静叶尾迹非定常流动特性的影响。研究结果表明:静叶尾迹形态和非定常流动特性受上下游动叶叠加干涉影响,且上下游转子对静叶尾迹干涉频率的异同将影响静叶尾迹流动的周期性;当上下游转子叶片对静叶尾迹干涉频率相同时,改变上下游转子的时序位置既可以实现对静叶栅出口气流脉动强度的调制,也可以实现对离心叶轮进口气流角波动幅值的调制。
The unsteady flow field of a combined compressor consisting of a first-stage axial flow and centrifugal impeller with a designed flow rate of 1.15 kg / s and a rotating speed of 60 kr / min was numerically simulated to clarify the effect of static vanes Wake morphology and flow characteristics to find out the main factors affecting the unsteady flow of stator wake and to explore the influence of interference frequency and bucket position on the unsteady flow characteristics of stator wake. The results show that the morphological and unsteady flow characteristics of the stator vanes are affected by the superimposed interference of the upstream and downstream moving blades, and the similarities and differences of the interference frequencies between the upstream and downstream rotor and the stator vane will affect the periodicity of the vortex stator wake. When the interference frequency of stator wake is the same, changing the timing position of the upstream and downstream rotors can not only modulate the pulsating intensity of the airflow at the outlet of the stator blade, but also modulate the fluctuating amplitude of the inlet airflow angle of the centrifugal impeller.