流固耦合作用对双向流道泵装置流场影响  

Numerical Calculation of Effect of Fluid-Structure Interaction on Flow Field in Pumping Stations with Two-Way Passages

作　　者：孟凡[1] 李彦军[1] 邵勇 裴吉[1] 陈佳[1] 

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013 [2]江苏省太湖治理工程建设管理局,江苏无锡214000

出　　处：《中国农村水利水电》2017年第1期175-179,共5页China Rural Water and Hydropower

基　　金：国家科技支撑项目(2015BAD20B01);国家自然科学基金(51409123);江苏省博士后科研资助计划项目(1401069B)

摘　　要：双向流道轴流泵装置由叶轮,导叶,双向进出水流道组成。双向进水流道由于其形状特征容易在叶轮进口端产生不稳定态,导致叶轮振动,而叶轮振动反过来又会影响泵装置的内部流动。为了研究流固耦合作用对双向流道轴流泵装置内部流场的影响,以双向流道轴流泵装置为研究对象,采用双向同步求解的方法对轴流泵内流场和叶轮结构响应进行联合求解。结构计算基于弹性体结构动力学方程;流场模拟基于Reynolds时均化N-S方程和SST湍流模型。在考虑双向进出水流道的情况下,将流固耦合计算前后所得轴流泵内部流场分布与叶轮表面压力分布进行对比分析。研究结果表明,考虑流固耦合作用后,进水流道出口处压力波动强度增大,涡量强度增大;叶轮工作面速度增大,导叶附近的漩涡位置发生变化;叶轮工作面与背面压力差减小,叶轮做功效率下降,轴流泵装置扬程下降。Axial pump station with two-way passage consists of impeller,diffuser,two-way inlet passage and two-way outlet passage.Because of the shape of the two-way inlet passage,the unsteady flow is easy produced in the impeller inlet which will cause impeller vibration.The impeller vibration will affect the internal flow of the pump device.A coupled solution of flow field and structural response of impeller is established by using two-way coupling method to study the effect of FSI（Fluid-structure Interaction） of impeller on flow field in pumping station with two-way passages.The structure response is based on elastic structural dynamic equation,and the flow field is based on Reynolds-averaging N-S equations and SST turbulent model.The distribution on flow field in axial-flow pump and the pressure in impeller is analyzed by comparing the calculated results without FSI.The analysis results indicate that after FSI,the pressure and vorticity gradient in the outlet of two-way inlet passage increase respectively,the differential pressure between pressure side and suction side of impeller decreases,the velocity in the pressure side increases,the vortex position are changed and the head of axial-flow pumping system decreases.

关 键 词：双向流固耦合 双流道轴流泵装置 数值计算 流场分布 叶轮表面压力分布 

分 类 号：TV136[水利工程—水力学及河流动力学] TH3[机械工程—机械制造及自动化]