叶轮流道入口喉部面积对离心泵空化性能的影响  

Influence of Inlet Throat Area of Impeller on Cavitation Performance for Centrifugal Pump

作　　者：王正港 王秀勇[1,2] 周建强 孙泽鹏 WANG Zheng-gang;WANG Xiu-yong;ZHOU Jian-qiang;SUN Ze-peng(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《液压气动与密封》2024年第3期12-17,共6页Hydraulics Pneumatics & Seals

基　　金：国家自然科学基金(51866009);国防基础科研计划(JCKY2019427D001)。

摘　　要：为了探究叶轮流道入口喉部面积对离心泵空化性能的影响,以某型号离心泵为研究模型,通过修改叶片包角和方格网流线构建了4组具有不同叶轮流道入口喉部面积的叶轮,基于RNG k-ε湍流模型和Schnerr-Sauer空化模型,对4组模型泵方案的空化性能进行数值模拟。研究结果表明:在保持叶轮流道出口面积不变的前提下,叶轮流道入口喉部面积增大,初生空化余量NPSH_i与临界空化余量NPSH_r的变化存在相反的趋势,两者之间没有倍数关系;临界空化余量NPSH_r主要与叶轮流道面积的变化趋势有关,宽敞流道有利于降低离心泵的临界空化余量,提高空化严重时的断裂扬程;初生空化余量NPSH_i与叶轮进口几何形状有关,为获得较小的初生空化余量,在水力设计过程中,须采用使入口喉部面积减小的措施。In order to explore the influence of throat area of impeller runner inlet on cavitation performance of centrifugal pump,four groups of impeller with different throat area of impeller runner inlet were constructed by modifying blade envelope Angle and grid flow line of a centrifugal pump model.Based on RNG k-e turbulence model and Schnerr-Sauer cavitation model,The cavitation performance of four model pump schemes was simulated numerically.The results show that when the outlet area of the impeller runner remains unchanged,the throat area of the inlet of the impeller runner increases,and the changes of the primary cavitation allowance NPSH,and the critical cavitation allowance NPSH.have opposite trends,and there is no multiple relation between them.The critical cavitation margin NPSH,is mainly related to the variation trend of the impeller runner area.The wide runner is beneficial to reduce the critical cavitation margin of the centrifugal pump and increase the fracture head when the cavitation is serious.The primary cavitation margin NPSH,is related to the impeller inlet geometry.In order to obtain a small primary cavitation margin,the inlet throat area must be reduced in the hydraulic design process.

关 键 词：离心泵 流道面积 初生空化 临界空化 数值模拟 

分 类 号：TH137[机械工程—机械制造及自动化] TH311