多工况下多级离心泵水动力噪声数值研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (9) : 50-55.

论文

多工况下多级离心泵水动力噪声数值研究

王凯1，李钰1，刘厚林1，夏晨1，刘中纯2

作者信息 +

Numerical simulation for hydrodynamic noise of a multistage centrifugal pump under multi-working condition

WANG Kai1LI Yu1 LIU Hou-lin1 XIA Chen1 LIU Zhong-cun2

Author information +

文章历史 +

摘要

采用Lighthill声类比理论研究了多工况下五级导叶式离心泵由偶极子声源激励产生的水动力噪声。数值计算了五级离心泵内部瞬态流场，提取其全级数壁面偶极子声源，并采用直接边界元法计算泵内流体诱导噪声。对泵进行基于模态响应的振动计算，并进行振动测试，经试验验证，多级离心泵内流动诱导振动噪声数值预测方法具有一定可行性。结果表明：随流量的增大，泵的进出口水动力噪声先升高后降低再升高，设计工况噪声水平最小；声压频率分布中BPF2及其特征频率上的噪声能量随流量的增大而增强，高频段的噪声能量明显增加；首级叶轮、后四级叶轮及正导叶的叶片数对泵内流噪声影响较大，而反导叶叶片数影响相对较小。研究结果可为低噪多级离心泵设计提供参考。

Abstract

Hydrodynamic noise excited by a dipole acoustic source in a five-stage diffuser centrifugal pump was studied with Lighthill acoustic analogy theory. The transient flow field inside the five-stage centrifugal pump was numerically simulated, and the dipole acoustic source on wall surface of all stages was extracted. The direct boundary element method was used to calculate the internal flow-induced noise in the pump. The pump’s vibration was calculated with the modal response method，vibration tests for the pump were also conducted. It was verified that the numerical prediction method for flow-induced noise in the pump has some certain feasibility. The results showed that with increase in flow rate, noise in the pump firstly increases, then decreases and increases again, the noise level is the minimum under the designed working condition; in the sound pressure frequency distribution, BPF2 and noise energy on its characteristic frequency increase with increase in flow rate, noise energy on a higher frequency range increases significantly; blade numbers of the first-stage impeller, another four stages’ impellers and positive guide vane have larger effects on flow induced noise, while blade number of the negative guide vane has a relatively smaller effect. The study results provided a reference for the design of low-noise multi-stage centrifugal pumps.

导出引用

王凯1，李钰1，刘厚林1，夏晨1，刘中纯2. 多工况下多级离心泵水动力噪声数值研究[J]. 振动与冲击, 2018, 37(9): 50-55

WANG Kai1LI Yu1 LIU Hou-lin1 XIA Chen1 LIU Zhong-cun2. Numerical simulation for hydrodynamic noise of a multistage centrifugal pump under multi-working condition[J]. Journal of Vibration and Shock, 2018, 37(9): 50-55

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