余热排出泵内部不稳定流动数值模拟与实验研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (24) : 33-38.

论文

陆荣袁建平朱钰雯付燕霞周帮伦

作者信息 +

Numerical and experimental study on flow instabilities in residual heat removal pump

Lu Rong Yuan Jianping Zhu Yuwen Fu Yanxia Zhou Banglun

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文章历史 +

摘要

为了研究余热排出泵在多工况下内部流动特性，基于ANSYS CFX软件，采用SST湍流模型，对模型泵进行三维非定常数值模拟，获得了不同工况下余热排出泵的水力性能、内部流场结构和压力脉动特性，同时展开压力脉动实验研究，并与计算结果进行对比。研究结果表明：大流量（1.2Qd）和设计流量（1.0Qd）工况下，叶轮和导叶内部流动比较稳定，随着流量的减小叶片进口背面附近开始形成失速旋涡，流道内均发生不同程度的流动分离，且沿着流道向出口处发展；叶轮出口压力脉动主频为7fz，受导叶叶片数影响；导叶和蜗壳出口的主频均为5fz，主要由叶频决定；设计流量下各监测点处压力脉动系数幅值最小，越往小流量工况，幅值越大；说明在小流量工况下余热排出泵内部出现了不稳定流动现象。

Abstract

In order to investigate the flow charateristics of residual heat removal pump under multi conditions，three-dimensional unsteady numerical simulations were conducted by using the SST turbulence model in ANSYS CFX．The performance、inner flow fields and pressure fluctuation of the residual heat removal pump under muiti conditions was obtained and compared with the experimental results．The results show that：the inner flow keep regular under 1.2Qd and 1.0Qd．However，with the decrease of the flow rate，The stall vortex generates near the suction side at the impeller and diffuser inlet associated with the onset of varying degrees of flow separation in the flow channels，which is intensified toward the outlet．The main frequency of pressure fluctuation at the outlet of impeller affected by the number of vanes is 7fz．The main frequencies at the outlet of both difusser and volute is 5fz，which are the blade passing frequency．The amplitudes of fluctuating pressure coefficient in all the monitoring points reach its minimum value under design condition，which increase gradually with the decrease of flow rate．It is concluded that the flow instabilites inside the pump occurs under small flow rate condition．

导出引用

陆荣袁建平朱钰雯付燕霞周帮伦. 余热排出泵内部不稳定流动数值模拟与实验研究[J]. 振动与冲击, 2016, 35(24): 33-38

Lu Rong Yuan Jianping Zhu Yuwen Fu Yanxia Zhou Banglun. Numerical and experimental study on flow instabilities in residual heat removal pump[J]. Journal of Vibration and Shock, 2016, 35(24): 33-38

参考文献

[1] 洪锋，袁建平，张金凤，等．余热排出泵小破口失水事故空化特性数值分析[J]．哈尔滨工程大学学报，2015，36（3）：297-301．
Hong Feng，Yuan Jianping，Zhang Jinfeng，et al．Numerical analysis of cavitating flow characteristics in residual heat removal pumps during the SBLOCA[J]．Journal of Harbin Engineering University，2015，36（3）：297-301．
[2] 袁建平，朱钰雯，周邦伦，等．余热排出泵内部压力脉动特性分析[J]．排灌机械工程学报，2015，33（6）：475-480．
Yuan Jianping，Zhu Yuwen，Zhou Banglun，et al． Analysis on pressure fluctuation in residual heat removal pumps[J]．Journal of Drainage and Irrigation Machinery Engineering，2015，33（6）：475-480．
[3] 朱荣生，苏保稳，杨爱玲，等．离心泵压力脉动特性分析[J]．农业机械学报，2010，41（11）：43-47．
Zhu Rongsheng，Su Baowen，Yang Ailing，et al．Numerical Investigation of Unsteady Pressure Fluctuation in Centrifugal Pump[J]．Journal of Agricultural Machinery，2011(11):43-47．
[4] Khalifa A E，Al-Qutub A M，Ben-Mansour R．Study of pressure fluctuations and induced vibration at blade-passing frequencies of a double volute pump[J]．Arabian Journal for Science and Engineering，2011，36（7）：1333-1345．
[5] 张人会，张学静，杨军虎．非设计工况下叶轮进口附近的流动及其控制[J]．兰州理工大学学报，2003，29（4）：64-66．
Zhang Renhui，Zhang Xuejing，Yang Junhu，et al．Flow field around intake of impeller under off-design conditions and its control[J]．Journal o f Gansu University of　 Technology，2003，29（4）：64-66．
[6] Johnson D A，Pedersen N，Jacobsen C B．Measurements of rotating stall inside a centrifugal pump impeller[C]．The Fifth International Symposium on Pumping Machinery，Houston，Texas，USA，June 19-23，2005，1281-1288．
[7] 张睿，陈红勋．改善失速工况下轴流泵水力性能的研究[J]．水力发电学报，2014，33（3）：292-298．
Zhang Rui，Chen Hongxun．Study on the improvement of hydrodynamic performance　of hydrodynamic performance of axial-flow pump at stall condition[J]．Journal of Hydroelectric Enginnering．2014，33（3）：292-298．
[8] Ducoin　A　J，Astolfi　A，Deniset F，Sigrist　J　F．Computational and experimental investigation of flow over a transient pitching hydrofoil[J]．European Journal of Mechanics B，2009，28（6）：728-743．
[9] Spence R，Amaral-Teixeira J．Investigation into pressure pulsations in a centrifugal pump using numerical methods supported by industrial tests [J]．Comput Fluids，2008，37（6）：690-704．
[10] Lucius Andreas， Brenner Gunther．Numerical Simulation and Evaluation of Velocity Fluctuations During Rotating Stall of a Centrifugal Pump[J]．Journal of Fluids Engineering，2011，133（8）：081101-081108．
[11] 刘厚林，刘明明，白羽，等．基于GCI的离心泵网格的收敛性[J]．江苏大学学报：自然科学版，2014，35（3）：279-283．
Liu Houlin，Liu Mingming，Bai Yu，et al．Grid convergence based on GCI for centrifugal pump[J]．Journal of Jiangsu University：Natural Science Edition，2014，35（3）：279-283．
[12] 谢龙汉，赵新宇，张炯明．ANSYS CFX流体分析及仿真[M]．北京：电子工业出版社，2012．
[13] Corporation H P．Numerical Simulation on the Effect of Turbulence Models on Impingement Cooling of Double Chamber Model[J]．Mathematical Problems in Engineering，2013，70（3）：1005-1021．
[14] 张德胜，吴苏青，施卫东，等．不同湍流模型在轴流泵叶顶泄漏涡模拟中的应用与验证[J]．农业工程学报，2013，29（13）：46-53．
Zhang Desheng，Wu Suqing，Shi Weidong，et al．Application and experiment of different turbulence models for simulating　tip leakage vortex in axial flow pump[J]．Transactions of the Chinese Society of Agricultural Engineering，2013，29（13）：46-53．
[15] 施卫东，徐磊，王川，等．蜗壳式离心泵内部非定常数值计算与分析[J]．农业机械学报，2014，45(3)：49-53．
Shi Weidong，Xu Lei，Wang Chuan，et al．Numerical Calculation and Analysis of Inner Unsteady Flow for Volute Centrifugal Pump[J]．Transactions of the Chinese Society for Agricultural Machinery，2013，29（13）：46-53．