基于涡动力学的离心泵内部流动诊断  

Internal Flow Diagnosis of Centrifugal Pumps Based on Vortex Dynamics

作　　者：王维军 王洋[2] 黎义斌[3] 陆荣 刘敏 WANG Wei-jun;WANG Yang;LI Yi-bin;LU Rong;LIU Min(Zhenjiang Research Institute of Fluid Engineering Equipment Technology,Jiangsu University, Zhenjiang 212009, Jiangsu Province, China;Research Center of Fluid Machinery Engineering and Technology, JiangsuUniversity, Zhenjiang 212013, Jiangsu Province, China;School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730010, China)

机构地区：[1]江苏大学镇江流体工程装备技术研究院,江苏镇江212009 [2]江苏大学流体机械工程技术研究中心,江苏镇江212013 [3]兰州理工大学能源与动力工程学院,兰州730010

出　　处：《中国农村水利水电》2019年第4期172-177,182,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51379091);江苏省自然基金面上项目(BK20171302);镇江市重点研发计划(社会发展)指导性项目(FZ2017023)

摘　　要：为了研究离心泵中涡结构、涡演化和涡的相互作用,基于RNG k-ε湍流模型和涡动力学诊断方法的正则化螺旋度、Q准则、BVF诊断等对离心泵设计工况下的涡旋运动进行数值研究。与传统方法获得的压力、速度云图相比较,涡动力学诊断可以准确捕捉到离心泵叶轮、蜗壳中的涡旋结构、强度变化。蜗壳蜗型段存在一对旋转方向相反的涡,与经典的卡门涡街脱落涡的旋转方向相反,该对涡来源于叶片压力面流动的分离;蜗型段压力脉动根源是叶轮上脱落的一对周期性涡,在隔舌处尤为明显;蜗壳扩散段存在两对涡,一对是蜗型段的主涡,一对是隔舌位置脱落的次涡-卡门涡街,两对涡相互作用在泵出口形成了一对不规则涡。给离心泵涡控制、流动减阻提供理论依据。In order to study the vortex structure, vortex and vortex evolution of centrifugal pump, the interior flow is numerically simulated by RNG k-ε turbulence model and vortex dynamics identification method including helicity, Q criterion, BVF. Compared with the traditional method to obtain the pressure and velocity contours, vortex dynamics identification can accurately capture vorticity changes in impeller and volute. The results show that there is a pair of vortexes with the opposite direction in volute spiral section, whose rotation direction compared with the classical Carmen vortex is contrary. The vortexes are from the flow separation of pressure surface on blades. The source of pressure pulsation on volute spiral section is the periodic shedding vortex on the impeller, especially in the tongue. There are two pairs of vortices in diffusion section of volute. One is the main vortex from the volute spiral section and the other is the secondary vortex-Carmen vortex falling off the tongue position, where it forms a pair of irregular vortex at volute outlet. The paper can provide a theoretical basis for vortex control and flow drag reduction in centrifugal pumps.

关 键 词：离心泵 涡量 涡旋 数值计算 压力脉动 

分 类 号：TV136[水利工程—水力学及河流动力学] TH311[机械工程—机械制造及自动化]