水力发电学报2024，Vol.43Issue(12)：116-124,9.DOI:10.11660/slfdxb.20241212
混流式气液两相泵叶顶泄漏涡动力学特性
Investigation on dynamic behaviors of tip clearance vortices in mixed gas-liquid two-phase flow pump
摘要
Abstract
Tip leakage vortices(TLVs)in a semi-open gas-liquid mixed transport pump are often accompanied by a large number of bubbles,which induce instability in pump operation.This study numerically simulates the flows in a three-stage semi-open mixed flow pump using an Euler-Euler inhomogeneous two-phase flow model and a MUSIG bubble distribution model to study the dynamic behaviors of the TLVs with bubbles.High-speed camera technology is used to capture their trajectory,structure,and developing process in an impeller blade period.The results indicate that in the vicinity of the blade tip clearance,the largest dissipation of vorticity is caused by the Coriolis force term,followed by the stretch-twist term.Under gas-liquid two-phase conditions,the magnitudes of the expansion-contraction term and the diagonal torque term decrease by an order of magnitude compared to the first two terms,while they increase with the increase in inlet gas volume fraction(IGVF).Bubble accumulation zones in the impeller affect the position of vortex dissipation zones,and the rotation of the impeller is the main cause of inducing vortex dissipation.关键词
混流泵/气液两相流/涡动力学/数值模拟Key words
mixed flow pump/gas-liquid two-phase flow/vortex dynamics/numerical simulation分类
能源科技引用本文复制引用
闫思娜,罗兴锜,冯建军,谢航,孙帅辉,朱国俊..混流式气液两相泵叶顶泄漏涡动力学特性[J].水力发电学报,2024,43(12):116-124,9.基金项目
国家自然科学基金(52409119 （）
52309118) （）
陕西省博士后科研基金(2023BSHEDZZ257) （2023BSHEDZZ257）
