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双级风扇转–静干涉单音噪声研究
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Abstract:
单音噪声是风扇的重要声源之一，风扇单音是叶片的粘性尾迹与下游叶片的周期性相互作用产生的。双级风扇中有四排叶片，声源更多。为降低双级风扇的噪声，首先需要研究双级风扇中的声源分布情况。本文主要研究双级风扇中R1-S1和R2-S2之间的尾迹干涉，分析了S1和S2叶片前传的单音噪声。采用非定常雷诺时均(URANS)和声类比方法(Goldstein方程)的混合方法，对比分析了三种单音噪声的强弱。结果表明：第2级处于“截通”状态的模态数量高于第1级，导致了S2产生的单音噪声高于S1。在1BPF处，S2在声功率级比S1高了13.09 dB。
The tone noise is one of the important sound sources of fan. Tone noise is generated by the interaction between the viscous wake of blade and the downstream vanes. There are four rows of blades in the two-stage fan, and the sound source is more. In order to reduce the noise of the two-stage fan, it is necessary to study the sound source distribution of the two-stage fan. This paper mainly studies the interaction between R1-S1 and R2-S2 of two-stage fan, and analyzes the tone noise of S1 and S2 blade forward transmission. The acoustic performance of the fan is numerically investigated using a hybrid unsteady Reynolds averaged Navier-Stokes (URANS)/acoustic analogy method (Goldstein equations). The result show that the number of “cut-on” modes of the second stage is higher than that of the first stage, resulting in higher tone noise of S2 than that of S1. The sound power level of S2 is 13.09 dB higher than that of S1 at 1BPF.
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