离心泵气液混输瞬态过渡过程水力特性研究  

Hydraulic characteristics of transient transition process of gas-liquid mixed flow in a centrifugal pump

作　　者：付强[1] 袁寿其[1] 朱荣生[1] 王秀礼[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《哈尔滨工程大学学报》2012年第11期1428-1434,共7页Journal of Harbin Engineering University

基　　金：国家杰出青年科学基金资助项目(50825902);江苏省科技支撑计划(BE2010156);江苏高校优势学科建设工程资助项目(PAPD);江苏省自然科学基金资助项目(BK2011504)

摘　　要：为研究离心泵进口管路因漏气而出现气液混输瞬态过渡过程的水力特性,采用Pro/E软件完成离心泵内部流道三维造型,利用雷诺时均N-S方程和RNG k-ε两方程及SIMPLEC算法,应用计算流体力学软件CFX对离心泵叶轮流道内的气液混输过渡过程的汽液两相湍流进行值模拟计算,并与试验结果进行对比.结果表明:离心泵发生含气量连续增大的气液混输过渡过程时,在离心力和惯性力共同作用下,叶轮进口的气泡相偏向叶片压力面的运动;叶轮流道内的气泡相的气体体积分数Cvol从零逐渐增加到一定值后急剧增加到最大值,缓慢下降到一定值保持不变;叶轮内部和出口处压力变化规律是先逐渐下降一定值后开始出现大幅度压力波动,而速度变化规律是逐渐变大到一定值后开始剧烈震荡.In order to study the transient gas-liquid mixed flow hydraulic characteristics of import pipeline leak, The Pro/E software were used for three-dimensional modeling of cen centrifugal pump on the trifugal pump chamber, the unstructured tetrahedral mesh, computational fluid dynamics software CFX, RNG k - e two-equation turbulence model, Reynolds time-averaged N-S equations and SIMPLEC algorithm was used for calculating the gas-liquid two- phase turbulent unsteady mixed flow transition process of centrifugal pump, the transient gas-liquid two-phase tran- pump was reserched on gas volume fraction continuously increases, the results show that nu- merical simulation results and experimental results of the change is consistent in trend. When the gas-liquid mixed flow transition occurs, bubbles phase flow line in the impeller deviation from the normal trajectory under the action of centrif- ugal force and inertia force, movement along the blade pressure surface, the gas phase volume fraction Cvo1 gradually in- creased from zero to maximum value rapidly in impeller, then decreased slowly to a certain value unchanged, the impel- ler and the outlet of centrifugal pump occur pressure fluctuations violently after the pressure decreased gradually to a cer- tain value, the velocity occurred dramatically vibration after gradually increases to a certain value.

关 键 词：离心泵 气液混输 气体体积分数 瞬态流动 数值模拟 动态特性 过渡过程 

分 类 号：TH311[机械工程—机械制造及自动化]