Abstract：In order to study the applicability of a turbulence mode for performances of an axial flow pump, the standard k-ε,RNG k-ε,SST k-ω models and large eddy simulation(LES)method were used. Based on the structured hexahedral and mesh slip technology, the performance prediction and numerical simulation of model axial flow pump with impeller diameter of 200 mm and nominal speed of ns=700 were carried out. The obtained head and efficiency of pump were analyzed and compared with the experimental results. The simulation and the experiment results show that all three models give satisfactory predictions of external characteristics in the operating condition and the result of RNG k-ε is relatively ideal, but different models have different characteristics when at off-design conditions. PIV measurement is performance for the axial clearance between the impeller and guide vane at 0.8Qopt,1.0Qopt and 1.2Qopt. Numerical simulated results for all four models are compared with the results from PIV measurement in the same areas. The streamlines for three models based on Reynolds time-ave-raged equations are found to be in a good agreement with PIV results, indicating the accuracy and vali-dity of the numerical simulation. But there is a certain deviation between the calculation results of LES and PIV results. Moreover, the flow features for different flow rates were analyzed.
[1]关醒凡.轴流泵与斜流泵[M].北京:中国宇航出版社,2009.[2]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社, 2010.[3]施法佳,陈红勋. 轴流泵内部流动数值模拟中湍流模式可用性的研究[J].上海大学学报:自然科学版,2006,12(3):273-277. Shi Fajia, Chen Hongxun. Applicability of turbulent models in simulation of internal flow within axial flow pump[J]. Journal of Shanghai University: Natural Sci-ence, 2006, 12(3): 273-277.(in Chinese)[4]黄欢明,高红,沈枫,等. 轴流泵内流场的数值模拟与实验[J].农业机械学报, 2008,39(8):66-69. Huang Huanming, Gao Hong, Shen Feng, et al. Numeriacl simulation and experimental validation of the flow field in axial flow pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2008, 39(8): 66-69.(in Chinese)[5]杨昌明,陈次昌,王金诺,等. 轴流泵端壁间隙流动特性的数值研究[J]. 机械工程学报,2003,39(9):49-51. Yang Changming, Chen Cichang, Wang Jinnuo, et al. Numerical study for behavior of tip clearance flow in axial-flow pump[J]. Chinese Journal of Mechanical Engineering, 2003, 39(9): 49-51.(in Chinese)[6]梁开洪,张克危,许丽. 轴流泵叶顶间隙流动的计算流体动力学分析[J].华中科技大学学报:自然科学版,2004,32(9):36-38. Liang Kaihong, Zhang Kewei, Xu Li. Analysis of the flow trough the blade tip clearances of axial pump by CFD[J]. Journal of Huazhong University of Science and Technology: Natural Science Edition, 2004, 32(9): 36-38.(in Chinese)[7]张德胜,邵佩佩,施卫东,等. 轴流泵叶顶泄漏流体动力学特性数值模拟[J]. 农业机械学报,2014,45(3):72-76. Zhang Desheng, Shao Peipei, Shi Weidong, et al. Numerical simulation of tip leakage vortex hydrodynamics characteristics in axial flow pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(3):72-76.(in Chinese)[8]施卫东,张华,陈斌,等. 不同叶顶间隙下的轴流泵内部流场数值计算[J]. 排灌机械工程学报,2010,28(5):374-377. Shi Weidong, Zhang Hua, Chen Bin, et al. Numerical simulation of internal flow field in axial-flow pump with different blade tip clearance sizes[J]. Journal of Drai-nage and Irrigation Machinery Engineering, 2010,28(5):374-377.(in Chinese)[9]施卫东,李通通,张德胜,等. 不同叶顶间隙对轴流泵空化性能及流场的影响[J]. 华中科技大学学报:自然科学版, 2013,41(4):21-25. Shi Weidong, Li Tongtong, Zhang Desheng, et al. Effect of tip clearance on the cavitation and flow field of axial flow pumps[J]. Journal of Huazhong University of Science and Technology: Natural Science Edition,2013,41(4):21-25.(in Chinese) [10]姚捷,施卫东,吴苏青,等. 轴流泵压力脉动数值计算与试验[J]. 农业机械学报, 2013,44(Z1):119-124. Yao Jie, Shi Weidong, Wu Suqing, et al. Numerical calculation and experiment on pressure fluctuation in axial flow pump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2013,44(Z1):119-124.(in Chinese)[11]张德胜, 施卫东, 陈斌,等. 轴流泵叶轮汽蚀两相流的数值模拟与分析[J].流体机械,2013,41(4):16-20. Zhang Desheng,Shi Weidong,Chen Bin,et al. Experiment and numerical simulation of cavitation flow in axial-flow pump impeller[J].Fluid Machinery, 2013,41(4):16-20.(in Chinese)[12]施卫东,孙新庆,陆伟刚,等.矿用潜水电泵性能正交实验[J].排灌机械工程学报,2011, 29(1):6-9. Shi Weidong, Sun Xinqing, Lu Weigang, et al. Orthogo-nal experimental on performance of submersible mining pump[J]. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(1):6-9.(in Chinese)[13]施卫东,邹萍萍,张德胜,等. 高比转速斜流泵内部非定常压力脉动特性[J].农业工程学报,2011,27(4):147-151. Shi Weidong, Zou Pingping, Zhang Desheng, et al. Unsteady flow pressure fluctuation of high-specific-speed mixed-flow pump[J]. Transactionas of the CSAE, 2011,27(4):147-151.(in Chinese)[14]Westra R W, Broersma L, Van Andel K, et al. PIV measurements and CFD computations of secondary flow in a centrifugal pump impeller[J]. Journal of Fluid Engineering, 2010, 132(6):1-8.[15]Tang Fangping, Liu Chao, Zhou Jiren, et al. PIV mea-surements and CFD analysis in an axial-flow pump[C]//Proceedings of 5th Joint ASME/JSME Fluid Engineering Conference, 2007:109-114.[16]Myers K J, Ward R W, Bakker Andre. A digital particle image velocimetry investigation of flow field instabilities of axial-flow impellers[J]. Journal of Fluids Enginee-ring, 1997,119(3):623-632[17]杨小林,严敬. PIV测速原理与应用[J]. 西华大学学报:自然科学版, 2005,24(1):19-21. Yang Xiaolin, Yan Jing. Principles for the measurement and image processing using PIV[J]. Journal of Xihua University:Natural Science, 2005,24(1):19-21.(in Chinese)
