流体机械

2019, v.47;No.559(01) 14-19+13

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基于正交试验及CFD的液环真空泵叶轮优化设计
Optimization Design of Liquid Ring Vacuum Pump Impeller by Orthogonal Experiment and CFD

赵万勇;宋乾斌;虎兴娜;
Zhao Wanyong;Song Qianbin;Hu Xingna;School of Energy and Power Engineering,Lanzhou University of Technology;Key Laboratory of Fluid machinery and System,Gansu Province;

摘要(Abstract):

为了提高液环真空泵的水力性能,改善其内部流动状态,运用正交试验结合数值模拟的方法对液环真空泵叶轮进行优化设计。选取轮毂比,偏心距,叶片数,叶片出口安放角为试验因素,每个因素取3个水平,对其进行正交试验方案设计。应用FLUENT 15.0对液环真空泵进行数值模拟计算,根据模拟结果与原型机的试验结果的对比,发现两者结果较为吻合,从而证明了该数值模拟方法的正确性及可行性。基于L_9(3~4)正交表,设计了9组方案,对这9组方案的数值模拟结果进行分析得到最优方案。通过对比优化前后液环真空泵模型的数值模拟结果可知,优化后的液环真空泵的性能有所提高,在额定工况下,进口真空度提高了2.38 kPa,轴功率下降了0.06 kW,内部流动状态也有所改善,达到了优化设计的目的。
In order to improve the hydraulic performance of liquid ring vacuum pump and improve its internal flow state,the optimization design of liquid ring vacuum pump impeller was carried out using the orthogonal test and numerical simulation. Hub ratio,eccentricity,number of blades,and impeller blade outlet angle were selected as the experimental factors. Each factor has three levels and the orthogonal test scheme was designed for them. The numerical simulation calculation of liquid ring vacuum pump was carried out by Fluent 15.0. According to the comparison between the simulation results and the test results of the prototype, it was found that they were in good agreement,thereby proved the correctness and feasibility of this numerical simulation method. Based on the L_9(3~4) orthogonal experiment,nine groups of schemes were designed. The numerical simulation results of the nine groups were analyzed to obtain the optimal scheme. By comparing the numerical simulation results of the vacuum pump model before and after the optimization,it can be known that the performance of the optimized liquid ring vacuum pump was improved somewhat. Under the rated working conditions,the inlet vacuum level was increased by 2.38 kPa,the shaft power was reduced by 0.06 kW,and the internal flow state was also improved somewhat,therefore,the goal of optimal design was achieved.

关键词(KeyWords): 液环真空泵;叶轮;正交试验;数值模拟;优化设计
liquid ring vacuum pump;impeller;orthogonal experiment;numerical simulation;optimization design

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基金项目(Foundation): 江苏大学国家水泵及系统工程技术研究中心开放基金项目(NRCP201605)

作者(Author): 赵万勇;宋乾斌;虎兴娜;
Zhao Wanyong;Song Qianbin;Hu Xingna;School of Energy and Power Engineering,Lanzhou University of Technology;Key Laboratory of Fluid machinery and System,Gansu Province;

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