The effect of unsteady vortex behavior on noise characteristics in a centrifugal compressor
The effect of unsteady vortex behavior on noise characteristics in a centrifugal compressor
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非定常涡流行为对离心压缩机噪声特性的影响
DOI：
10.1088/1742-6596/1909/1/012021
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ohta Yutaka
中科院分区：
文献类型：
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作者：
Tajima Kenta;Miida Hiroshi;Fujisawa Nobumichi;Ohta Yutaka
通过实验和数值技术研究了扩压器宽度对配备无叶扩压器的离心压缩机噪声水平的影响。为此，压缩机中安装了两个不同宽度的扩压器。如果使用更宽的扩散器，则会出现带宽（800 至 900 Hz）噪声和压力波动，接近 1/2BPF (700 Hz)。发生这种波动是因为泄漏涡流具有两种不同的频率。 1 型涡流是从主叶片排出并覆盖通道 1 的涡流。2 型涡流与 1 型涡流长度相同，但从分流叶片排出。 3型涡旋覆盖通道1和通道2；这些是从主叶片排出的。 3 型涡流主要在 270 处产生，其频率在 1/2 BPF 频率下约为 700 Hz。前两种涡流偶尔出现，频率约为1400Hz。由于较高的压力恢复，3 型涡流随着更宽的扩压器而增大，这导致叶轮叶片受到浆液负载。宽带噪声脉动是由两种频率涡旋的共存而产生的。
The effect of diffuser width on the noise level of a centrifugal compressor equipped with vaneless diffusers was investigated through experiments and numerical techniques. In this regard, two diffusers with different widths were installed in the compressor. In case the wider diffuser was used, there was the bandwidth (800 to 900 Hz) noise and pressure fluctuation which was closed to 1/2BPF (700 Hz). This fluctuation occurred because the leakage vortices were of two different frequencies. Type 1 vortices are the ones that were discharged from the main blade and covered Passage 1. Type 2 vortices had the same length as Type 1, but they were discharged from the splitter blade. Type 3 vortices covered both Passages 1 and 2; these were discharged from the main blade. Type 3 vortices were generated predominantly at 270, and their frequency was approximately 700 Hz at 1/2 BPF frequency. The former two types of vortices occurred occasionally, and their frequency was approximately 1400 Hz. Type 3 vortices grew with the wider diffuser because of the higher pressure-recovery, which caused the serous loading to the impeller blades. The broadband noise fluctuation occurred by the coexistence of the two frequency vortices.