水力发电学报2025，Vol.44Issue(11)：1-12,12.DOI:10.11660/slfdxb.20251101
进口含气率对多级气液离心泵级间特性的影响研究
Study on influence of inlet gas volume fraction on inter-stage characteristics of multistage gas-liquid centrifugal pumps
摘要
Abstract
Multistage centrifugal mixed-flow pumps are commonly used to transport high-pressure gas-liquid two-phase fluids.However,gas pockets often develop in the impeller section of such pumps due to gas-phase compressibility and the inter-phase slip velocity,and cause uneven flow distribution with inconsistent pressure-boosting capabilities across pump stages.This study presents experimental tests on two systems of 3-stage and 25-stage centrifugal pumps,and examines the influence of inlet gas volume fraction(IGVF)on the inter-stage characteristics.We apply an Euler-Euler inhomogeneous flow model to simulate the 3-stage system for conditions of different gas compressibilities.The results show that at single water phase conditions,pressure rises nearly the same across different impellers.For gas-liquid conditions,the overall pressure-boosting capacity decreases significantly with the increasing IGVF,with the secondary and final-stage impellers outperforming the first stage.Gas accumulation intensifies in the impeller passages,spreading along the suction sides of the blades up to the outlet.Velocity threshold analysis reveals that velocity-area ratio decreases stage by stage at the low thresholds,while increases progressively at the medium thresholds,indicating an enhanced impeller pressurization.For gas-liquid conditions,pulsating entropy generation losses are primarily concentrated near the impeller inlet and diffuser inlet.This study lays a basis for optimizing the design of multistage mixed-flow pumps.关键词
多级离心泵/级间特性/数值模拟/含气率/流动规律Key words
multistage centrifugal pump/inter-stage characteristics/numerical simulation/gas volume fraction/flow pattern分类
机械工程引用本文复制引用
闫思娜,王净净,冯建军,戈振国,朱国俊,罗兴锜..进口含气率对多级气液离心泵级间特性的影响研究[J].水力发电学报,2025,44(11):1-12,12.基金项目
国家自然科学基金(52409119) （52409119）
陕西省自然科学基础研究计划项目(2025JC-QYXQ-023) （2025JC-QYXQ-023）
