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首页> 外文期刊>Journal of turbomachinery >Rotor-Alone Tones in the Outflow Noise of a Centrifugal Compressor
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Rotor-Alone Tones in the Outflow Noise of a Centrifugal Compressor

机译：单独的离心式压缩机的流出噪声中的转子色调

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This article investigates the generation of rotor-alone tones and their contribution to the outflow noise of a transonic centrifugal compressor stage with vaneless diffuser and volute by means of unsteady full-annulus computational fluid dynamics (CFD) simulations. The aerodynamic field and the generation and propagation of sound were simulated simultaneously using the unsteady Reynolds-averaged Navier-Stokes (URANS) approach of the solver trace and a numerical grid consisting of 170 M cells. To assess the accuracy of the predicted fluctuations, the investigation compares the simulated diffuser flow field to measured flow angles and pressure fluctuations obtained from experiments conducted on a large-scale test rig. The analysis explains the different sound generation mechanisms responsible for tonal components in the acoustic spectrum at the compressor outlet based on the Fourier decomposition of the pressure fluctuations in diffuser and volute. Furthermore, this article analyzes the modal structure of the simulated sound field at the volute outlet by means of a radial mode analysis and discusses the influence of changing operating conditions on the sound power emitted. The analyses reveal that supersonic flow phenomena occurring at choked operating conditions cause a significant increase in noise emissions. Furthermore, the investigation shows that the sound field at the volute outlet is dominated by few low-order modes, a fact that justifies the analysis using methods based on the compressed sensing in future experimental investigations.
机译：本文调查了单独的转子音调的产生及其对横向离心压缩机级的流出噪声的贡献，通过不稳定的全环计算流体动力学（CFD）模拟，逐渐扩散和蜗壳。使用求解器迹线的不稳定雷诺平均天线（URANS）方法同时模拟声音的空气动力学场和发电和传播和发电和传播。由170μm细胞组成的数值网格。为了评估预测波动的准确性，研究将模拟的扩散器流场比较了测量的流动角度和从大型试验台上进行的实验获得的压力波动。该分析说明了对压缩机出口处的声学光谱中的色谱分量的不同声音产生机制，基于扩散器和蜗壳中的压力波动的傅里叶分解。此外，本文通过径向模式分析分析了蜗壳出口处模拟声场的模拟结构，并讨论了改变操作条件对发出的声音的影响。分析显示，在窒息操作条件下发生的超音速流动现象导致噪声排放的显着增加。此外，调查表明，蜗壳出口处的声场由几个低位模式主导，这是使用基于未来实验研究的压缩感测的方法来证明分析的事实。

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