多工况下分流叶片离心泵非定常空化特性分析

发布时间：2018-06-17 23:18

  本文选题：离心泵 + 分流叶片　； 参考：《水力发电》2017年08期

【摘要】：为了进一步优化离心泵叶轮流道,提高离心泵的空化性能,对有/无分流叶片离心泵进行全流道三维非定常湍流空化数值模拟,分析0.4Q~1.0Q工况下泵的空化性能。结果显示:在空化充分发展的情况下,无分流叶片离心泵扬程对NPSH的降低比较敏感;添加分流叶片后,离心泵的扬程提高,叶轮进口部位的低压区域减少,叶轮内湍动能明显减小,泵的抗空化性能明显增强;随着流量的降低,泵的临界空化余量降低,但泵内发生严重空化的速率逐渐加快;当离心泵内发生严重空化时,空泡将堵塞整个叶轮流道。
[Abstract]:In order to further optimize the impeller passage of centrifugal pump and improve the cavitation performance of centrifugal pump, the three-dimensional unsteady turbulent cavitation numerical simulation of the centrifugal pump with and without shunt vane is carried out, and the cavitation performance of the pump under 0.4Q / 1.0Q condition is analyzed. The results show that, with the full development of cavitation, the head of centrifugal pump without shunt vane is sensitive to the decrease of NPSH, and the lift of centrifugal pump increases and the low pressure area of impeller inlet decreases after adding shunt blade. The turbulent kinetic energy in impeller is obviously reduced and the anti-cavitation performance of pump is obviously enhanced. With the decrease of flow rate, the critical cavitation margin of pump decreases, but the rate of serious cavitation in pump increases gradually; when serious cavitation occurs in centrifugal pump, The cavitation will block the entire impeller passage.
【作者单位】： 西华大学能源与动力工程学院;
【基金】：国家自然科学基金资助项目(51379179) 流体及动力机械四川省科技创新研究团队(2011JTD0016) 西华大学研究生创新基金项目(ycjj2016096)
【分类号】：TH311
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本文编号：2032893