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离心泵作液力透平的数值模拟 预览 被引量:2

Numerical Simulation of Centrifugal Pump with Turbine Flow Field
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摘要 以多级液力透平的首级为研究对象,应用ANSYS CFX软件对泵和液力透平流场进行数值模拟,得到泵及泵作透平使用时的外特性曲线.由外特性曲线可知:液力透平最高效率点的流量、扬程、效率和比转速分别是泵最高效率点的1.93、2.35、1.30、0.73倍;当透平流量增加到65.7m3/h时才有功率输出,此时存在最小扬程84.5m,其流量和扬程分别是最高效率点的0.480、0.571倍.对液力透平的内部速度场和压力场随流量的变化进行分析可知:导叶入口存在二次流和回流,通过导叶的导流作用,导叶漉道内的速度分布得到很好的改善;叶轮内部存在漩涡和脱流区,且脱流区的范围随着流量的增加而增大;透平内部的压力从导叶进口到叶轮出口逐渐减小,随着流量的增加压差逐渐增大,这和透平的流量-扬程曲线相吻合. Taking first order of multistage hydraulic turbine as the research object,the ANSYS CFX software was used to simulate the pump and hydraulic turbine flow field to obtain external characteristic curves which shows that flow rate,head,efficiency and specific speed at the point with highest efficiency is 1.93,2.35,1.30 and 0.73 times that of the turbine respectively.The power doesn' t output only at the time that turbine flow rate is increased to 65.7m3/h,there exists a minimum head of 84.5m and its flow rate and head are 0.48 and 0.57 times that of the highest efficiency point.Analyzing the change of both internal velocity and pressure field with the flow rate shows that both secondary and return flow exists in blade head of the guide vane,through the guide vane diversion effect,the velocity distribution in guide vane can be well improved; and both vortex and separation flow region can be found in the impeller,and the increase of flow rate can make separation flow region increase; the internal pressure in turbine gradually decreases from the diffuser inlet to the impeller outlet,and the pressure gradually increases with the increase of flow rate,and this coincides with the HQ curve of the turbine.
作者 周榕 唐晓晨 王辉 戴露 马骏 ZHOU Rong,TANG Xiao-chen,WANG Hui,DAI Lu,MA Jun( 1.No.710 Institute, China Shipbuilding Industry Corporation, Handan 056027, China; 2.Jiangsu Zhenhua Pump Manufacturing Co., Ltd., Jiangyan 225500, China;)
出处 《化工机械》 CAS 2013年第5期642-647,共6页 Chemical Engineering & Machinery
关键词 液力透平 数值模拟 流场分析 导叶 pump hydraulic turbine numerical simulation flow field analysis guide vane
作者简介 周榕,男,1965年10月生,高级工程师。湖北省武汉市,430064。
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