偏离设计工况下混流泵流动特性分析  

Analysis of the Flow Characteristics of a Mixed Flow Pump Under the Off-design Conditions

作　　者：李景悦[1] 赖喜德[1] 雷明川[1] 夏密秘[1] 

机构地区：[1]西华大学能源与动力工程学院,四川成都610039

出　　处：《热能动力工程》2016年第7期74-79,136,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51379179);西华大学研究生创新基金资助项目(ycjj2015047)

摘　　要：为探究不同工况下混流泵的流动特性，采用计算流体动力学软件，对0．6Q0～1．4Q0变流量工况下某一低比转速混流泵的内部流动状态进行仿真模拟。研究不同流量下该混流泵的外特性变化趋势，并重点分析混流泵叶轮和导叶区域流动的压力、速度以及湍动能耗散情况。结果表明，混流泵在偏离设计工况下运行会产生不同程度的回流、涡流，且流量越小该现象越严重。在导叶出口区域附近，其湍动能耗散随流量增大而增大，这些因素都会降低混流泵的效率。本文对混流泵的高效使用具有一定的指导作用。同时可为混流泵的优化设计提供参考。To investigate the flow characteristics of a mixed flow pump under various operating conditions,by employing the computational fluid mechanics software,a simulation was performed of the flow state inside a low specific rotating speed mixed flow pump. In this connection,the variation tendency of the external characteristics of the pump at various flow rates were studied and the pressure,speed and turbulent flow energy consumption of the fluid flowing in the area of the impeller and guide blades of the pump were focally analyzed. It has been found that the operation of the pump under the off-design conditions may produce the returning flow and vortex phenomena to various extents and the smaller the flow rate,the more serious the phenomena. At a place nearing the outlet of the guide blades,the turbulent kinetic energy consumed will increase with an increase of the flow rate. Moreover,these factors will lower the efficiency of the pump. The foregoing can offer certain guidance for efficient use of mixed pumps and at the same time,provide reference for optimized design of mixed pumps.

关 键 词：混流泵 流动特性 仿真模拟 不同流量 

分 类 号：TH313[机械工程—机械制造及自动化]