流体激励下多级离心泵辐射噪声特性研究

发布时间：2018-04-26 18:54

本文选题：多级离心泵 + 多工况　；参考：《华中科技大学学报(自然科学版)》2017年11期

【摘要】：为研究多级离心泵运行时产生的外场噪声,以一台五级导叶式离心泵为研究对象,研究了流体激励下泵的辐射噪声特性.通过外场噪声试验结果与计算结果之间的对比,验证了多级离心泵辐射噪声数值预测方法的有效性.提取泵全级数流体表面偶极子声源,并基于声振耦合方法计算了泵外场噪声.研究结果表明:泵外场噪声声压水平约为75~85dB,随着流量增大,噪声水平先减小再增大;流量变化对辐射声功率谱上特征频率处水平影响不明显,对宽频带影响较大;在大流量工况下,叶轮及正导叶叶片数对辐射噪声影响明显,反导叶叶片数影响较小;BPF2频率处声压水平比BPF1处高约11~20dB;在BPF2处辐射声压分布中0.4Qd工况下,上游噪声强于下游,随流量增大,噪声最大值区域向出口附近转移.
[Abstract]:In order to study the external field noise produced by multistage centrifugal pump, the radiation noise characteristics of a five-stage guide vane centrifugal pump are studied. The effectiveness of the numerical prediction method for radiation noise of multistage centrifugal pump is verified by comparing the results of external field noise test with that of calculation. The pump surface dipole sound source is extracted and the external field noise is calculated based on the acoustic-vibration coupling method. The results show that the noise sound pressure level is about 75 ~ 85dB. with the increase of flow rate, the noise level decreases first and then increases, and the change of flow rate has no obvious effect on the level of characteristic frequency on the radiation acoustic power spectrum, but has a great effect on the wide band. Under the condition of large flow rate, the number of impeller and positive vane has a significant effect on the radiated noise, and the acoustic pressure level at the frequency of BPF2 is about 1120dB higher than that at BPF1, and the upstream noise is stronger than the downstream under the condition of 0.4Qd in the distribution of radiation sound pressure at BPF2. As the flow rate increases, the maximum noise region shifts to the exit.
【作者单位】：江苏大学流体机械工程技术研究中心;江苏长江水泵有限公司;
【基金】：国家重点基础研究发展计划资助项目(2016YFB0200901) 中国博士后科学基金资助项目(2016M600370) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：TH311

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