【摘要】 针对某泵站水泵并联运行空管开机存在的具体问题,以气-液(水)两相瞬态流动为研究对象,采用VOF模型对管内的气液两相流进行数值模拟。计算结果表明:充水过程中管内存在着泡状流、塞状流、分层流、波状流以及弹状流;管内液相体积分数经历了线性增长、无规律增长直至不再增长这3个时期;气液两相流造成的能量损失大于单相流。通过数值模拟计算,解释了该泵站空管开机造成出水管口喷水现象的原因,数值模拟分析结果与现场喷水情况基本吻合。更多还原

【Abstract】 In connection with the specific problem of a certain pump station when the pumps run in parallel without being filled with any water,gas-liquid(water) two-phase transient flow is taken as the object of study,the VOf model is adopted for the gas-liquid two-phase flow in the pipeline to conduct numerical simulation.The results show that there exist bubbly flow,plug flow,stratified flow,wavy flow and bomb flow;liquid volume fraction in the pipe has experienced three periods including linear growth,irregular growth till to no longer growth.the energy loss caused by the gas-liquid two-phase flow is greater than single-phase flow.Through the numerical simulation,it explains the reson of water jet phenomenon in the pipe outlet when the pumps run with no water,the analytic results of numerical simulation are basically consistent with the site water spray.更多还原