排灌机械工程学报2016，Vol.34Issue(4)：307-312,6.DOI:10.3969/j.issn.1674-8530.15.0130
基于 VOF 模型的轴流泵机组起动过程数值模拟
Numerical simulation of axial pump unit startup process using VOF model
摘要
Abstract
To reveal the start-up transient laws of the hydraulic parameters and the flow pattern in the passage of the axial pump unit,three-dimensional numerical simulations have been conducted on the geometrical model of the whole flow system including the inlet conduit,runner,stay vanes,siphon out-let passage and upstream reservoir under the two conditions:preopening vacuum breaker valve and keeping the valve close.The volume of fluid (VOF)model was adopted and the Realizable k -εtur-bulence model was applied to close the governing equations.Numerical results show that when the wa-ter flow went over the hump,the air within the outlet passage continuously was involved into the water and discharged by the vortex in the declining section of the outlet passage so that siphon formed eventually.The larger the original bubbles in the outlet passage were,the longer the time of syphon formation required.Compared with the scheme of keeping the vacuum breaker valve closed,preope-ning the vacuum breaker valve in advance can make the maximum pump lift decrease by 30% and the start-up time shortened by 64%.关键词
轴流泵机组/虹吸式出水流道/起动过程/VOF 模型/三维数值模拟Key words
axial pump unit/siphon outlet passage/start-up process/volume of fluid model/three-dimensional numerical simulation分类
农业科技引用本文复制引用
周大庆,刘跃飞..基于 VOF 模型的轴流泵机组起动过程数值模拟[J].排灌机械工程学报,2016,34(4):307-312,6.基金项目
国家自然科学基金资助项目 （）
