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本文以某一组合压气机为研究对象,采用数值方法模拟三排叶片在设计工作点的非定常流场。依据转/静/转模型中静叶表面压力波动幅频特性,确定影响静叶表面压力波动的因素,通过对比转/静/转模型和时序模型中静叶表面压力分布情况,获得上下游动叶叶片数目对中间叶片表面压力分布影响。最后引入转/静模型,通过应用模型分解减法获得两组影响因素相对叠加相位,从而揭示上下游叶片数目和时序位置影响中间叶片表面压力分布机理。结果表明:上下游动叶叶片数目的异同直接影响中间静叶表面压力波动的周期特性。两组影响因素的相对叠加相位决定着压力波动幅值大小。
In this paper, a certain combination of compressors is taken as the research object. The numerical method is used to simulate the unsteady flow field of three rows of blades at the design working point. According to the amplitude-frequency characteristics of stator blade surface pressure in the rotor / stator / rotor model, the factors affecting the stator blade surface pressure fluctuation are determined. By comparing the stator blade surface pressure distribution in the rotor / stator / rotor model and the timing model, Influence of leaf number on the surface pressure distribution of middle leaf. At last, the model of the transitional / static model is introduced. By applying the model decomposition and subtraction method, the relative stacking phase of the two groups of influencing factors is obtained, which reveals the mechanism of the pressure distribution on the surface of the intermediate blade. The results show that the similarities and differences of the number of moving blades on the upstream and downstream directly affect the periodic characteristics of the pressure fluctuation on the surface of the intermediate stator blades. The relative superimposition phase of two influencing factors determines the amplitude of pressure fluctuation.