| 程效锐,王鹏,张爱民,涂艺萱.离心泵叶片缝隙对声场特性影响的研究[J].声学技术,2020,39(5):611~617 |
| 离心泵叶片缝隙对声场特性影响的研究 |
| Study on the influence of blade slot of centrifugal pump on its sound field characteristics |
| 投稿时间：2019-08-04 修订日期：2019-09-05 |
| DOI：10.16300/j.cnki.1000-3630.2020.05.014 |
| 中文关键词: 离心泵 压力脉动 内声场噪声 叶片开缝 |
| 英文关键词: centrifugal pump pressure pulsation internal sound field noise blade slitting |
| 基金项目:国家自然科学基金（51469013）资助项目。 |
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| 中文摘要: |
| 为进一步研究离心泵的声场特性，对离心泵叶轮叶片尾缘进行开缝测试。考虑开缝径向直径Dk和缝隙宽度B，设计了18组正交试验来探究叶片尾缘缝隙对声场的影响。针对离心泵噪声的发生机理，采用重整化群k-ε（Re Normalization Group，RNG k-ε）模型对离心泵进行全流场非定常数值模拟，并根据FW-H方程提取蜗壳壁面的湍流脉动作为偶极子声源，基于声学边界元法进行离心泵声场计算，将声学计算结果与流场压力脉动结果进行综合分析。研究结果表明：压力脉动可在一定程度上反映声压级的大小，隔舌区压力脉动波动剧烈，此处是噪声的主要发生源。开缝叶片可以有效改善叶轮出口的不均匀流动，对内外声场噪声的降低有一定的积极作用，且在径向开缝位置γ=0.90时降噪效果最佳。 |
| 英文摘要: |
| In order to further study the sound field characteristics of centrifugal pump, the slotting tests for the blade trailing edge of centrifugal pump impeller are carried out. Eighteen sets of orthogonal experiments are designed to study the influence of the blade trailing edge gap on the sound field. According to the generation mechanism of centrifugal pump noise, the re normalization group (RNG) k-ε model is used to simulate the unsteady value of full flow field of the centrifugal pump, and the turbulence pulsation action of the volute wall surface is extracted as the dipole sound source according to the FW-H equation. Based on the boundary element method the sound field of the centrifugal pump is calculated. The comparative analysis between the calculated acoustic field and the pressure pulsation of flow field is made. The results show that the pressure pulsation can reflect the magnitude of the sound pressure level to a certain extent, and the pressure pulsation fluctuates violently in the tongue area, which is the main source of noise. The slotted blade can effectively improve the uneven flow at the outlet of impeller, and has a certain positive effect on the reduction of the internal and external noise fields, and the noise reduction effect is the best when the radial slot position γ=0.90. |
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