排灌机械工程学报2017，Vol.35Issue(5)：381-386,6.DOI:10.3969/j.issn.1674-8530.16.0108
基于改进Kunz模型的船用离心泵空化特性
Analysis of cavitation characteristics of marine centrifugal pump based on modified Kunz model
摘要
Abstract
Cavitation erosion may be inevitable when a marine centrifugal pump is in operation.Thus,in order to investigate effects of cavitation on the performance of a marine centrifugal pump,the turbulent pressure fluctuation was involved in the Kunz cavitation model to alter the phase transition critical pressure,i.e.vaporization pressure.A marine centrifugal pump with a specific speed of 132.7 was chosen as a study model and its cavitation performance was predicted numerically and experimentally at different flow rates.It was found that both Kunz model and its updated version were able to capture the critical cavitation condition,and the head curve due to the updated model was in better agreement with the observed curve.In addition,the vapor volume fraction distribution between two blades and the blade loading distribution based on that improved model were analyzed at the design point.The results show that bubbles were generated on the pressure suction side near the leading edge at first,then a small amount of bubbles occurred on the blade pressure side with decreasing cavitation number.At last,the impeller passages were fully blocked by bubbles,leading to a declined performance for the centrifugal pump.With the decrease of cavitation number,a low pressure zone occurred near the blade inlet edge firstly,then spread along the blade toward the blade outlet,eventually the low pressure co-vered the blade pressure and suction sides.The blade loading in the middle streamline of blade 5(the blade near the tongue) was smaller than that in blade 2 (the blade is axisymmetric with blade 5).With the decrease of cavitation number,the pressure on the blade surfaces was reduced,and there was a zero pressure at the inlet of blade 2,this is mainly caused by cavitation aggravation.关键词
船用离心泵/空化特性/Kunz模型/试验/数值分析Key words
marine centrifugal pump/cavitation characteristics/Kunz model/experiments/numerical analysis分类
农业科技引用本文复制引用
王勇,陈杰,罗凯凯,刘东喜,李雨,严骏..基于改进Kunz模型的船用离心泵空化特性[J].排灌机械工程学报,2017,35(5):381-386,6.基金项目
江苏省"六大人才"高峰项目(GDZB-017) （GDZB-017）
流体及动力机械教育部重点实验室开放课题资助项目 （）
江苏省产学研联合创新资金--前瞻性联合研究项目(BY2015064-10) （BY2015064-10）
江苏高校优势学科建设工程项目 （）
