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Numerical investigation of aerodynamic load on the impellers of centrifugal compressor with leakage flow

机译:具有泄漏流动的离心式压缩机叶轮空气动力载荷的数值研究

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摘要

Based on computational fluid dynamics (CFD) simulation, this study investigates the effect of leakage flow on the performance of centrifugal compressor, which helps to showcase the flow phenomenon considering the leakage flow and the aerodynamic load on the impellers. We consider four types of compressor models including the normal stage with hub and shroud leakages (SWT), the normal stage with hub leakage (SWH), the normal stage with shroud leakage (SWS), and the normal stage without leakages (SOT)). The results indicate that the leakage flow obviously affects the compressor performance, especially the flow field around the leading/trailing edge of the impeller. The aerodynamic load at the leading/trailing edge of the impeller was obtained for the models through unsteady simulation. The dominant frequency and the pulse amplitude obtained by Fast Fourier transforms revealed that the main frequencies of the aerodynamic load present different distributions under different leakage flows.
机译:基于计算流体动力学(CFD)仿真,本研究调查了泄漏流量对离心式压缩机性能的影响,这有助于展示考虑泄漏流动和叶轮上的空气动力负荷的流动现象。我们考虑四种类型的压缩机模型,包括枢纽和护罩泄漏(SWT),具有轮毂泄漏(SWH)的正常舞台,带有护罩泄漏(SWS)的正常舞台,以及没有泄漏(SOT)的正常舞台) 。结果表明,泄漏流明显影响压缩机性能,尤其是叶轮的前导/后缘周围的流场。通过不稳定模拟获得叶轮的前导/后缘处的空气动力载荷。通过快速傅里叶变换获得的主频率和脉冲幅度显示出在不同泄漏流下的空气动力负载的主频率存在不同的分布。

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