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Numerical analysis of transition process of solid-liquid two-phase in rotor-stator cascades |
Han Wei, Yue Ting, Li Rennian, Jin Yi, Jiang Lei, Hu Penglin |
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China |
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Abstract In order to study the transient flow characteristics of the solid-liquid two-phase flow in rotor-stator cascades,a centrifugal pump with radial diffusers was chosen as the object of study and its model was established. The structured grid was finished and the three dimensional flow field was simulated based on the mixture multiphase model, the detached eddy simulation model and the user defined function. The internal transient flow was analyzed. The results obtained show that the area of minimum pressure located at the inlet of blade suction side becomes wide during the transition process. Simultaneously, the area of the highest pressure which is at the blade pressure side and near the impeller tip becomes shrinking. The vortexes in the channel of the rotor cascades evolves constantly and vortexes are formed gradually at the inlet of the rotor blade because of the turbulence intensity as the flow rate becomes larger. The solid-phase deposits at the outlet of the stator cascades easily at small flow rates. With the flow rate increases, the global volume fraction of solid-phase decreases and its distribution becomes homogeneous on the meridian middle streamline of the rotor cascades.
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Received: 22 August 2014
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[1]王秀礼,袁寿其,朱荣生,等. 离心泵变工况过渡过程瞬态水力特性研究[J].振动与冲击,2012,31(24):48-53. Wang Xiuli,Yuan Shouqi,Zhu Rongsheng,et al. Tran-sient hydraulic characteristics of a centrifugal pump under variable working conditions[J]. Journal of Vibration and Shock,2012,31(24):48-53.(in Chinese)[2]Pei Ji, Yuan Shouqi, Yuan Jianping, et al. The influence of the flow rate on periodic flow unsteadiness behaviors in a sewage centrifugal pump[J]. Journal of Hydrodynamics,2013,25(5):702-709.[3]Feng J,Benra F K,Dohmen H J. Unsteady flow visua-lization at part-load conditions of a radial diffuser pump: By PIV and CFD[J]. Journal of Visualization,2009,12(1):65-72.[4]Shigemitsu T,Fukutomi J,Kaji K, et al. Unsteady internal flow conditions of mini-centrifugal pump with splitter blades[J]. Journal of Thermal Science, 2013, 22(1):86-91.[5]邵春雷,顾伯勤,陈晔. 离心泵内部非定常压力场的数值研究[J]. 农业工程学报,2009,25(1):75-80. Shao Chunlei,Gu Boqin,Chen Ye. Numerical simulation of unsteady pressure field in centrifugal pumps[J]. Transactions of the CSAE,2009,25(1):75-80.(in Chinese)[6]Liu Houlin,Wang Kai,Kimhy Youngbum, et al. Experimental investigation of the unsteady flow in a double-blade centrifugal pump impeller[J]. Science China:Technological Sciences,2013,56(4):812-817.[7]Tan Minggao,Yuan Shouqi,Liu Houlin, et al. Numerical research on performance prediction for centrifugal pumps[J]. Chinese Journal of Mechanical Engineering,2010,23(1):21-26.[8]黎义斌,赵伟国,王秀勇,等. 离心泵变工况流场分析及数值模拟[J]. 兰州理工大学学报,2007,33(6):43-46. Li Yibin,Zhao Weiguo,Wang Xiuyong, et al. Analysis and numeric simulation of off-design flow field in centri-fugal pump[J]. Journal of Lanzhou University of Technology,2007,33(6):43-46.(in Chinese)[9]Zhang Yuliang,Li Yi,Cui Baoling,et al. Numerical si-mulation and analysis of solid-liquid two-phase flow in centrifugal pump[J]. Chinese Journal of Mechanical Engineering, 2013,26(1):53-60.[10]Zhu Zuchao,Guo Xiaomei,Cui Baoling,et al. External characteristics and internal flow features of a centrifugal pump during rapid startup[J]. Chinese Journal of Mechanical Engineering,2011,24(5):798-804.[11]武鹏,吴大转,李志锋,等. 离心泵流量突增过程瞬态流动研究[J]. 工程热物理学报,2010,31(3):420-422. Wu Peng,Wu Dazhuan,Li Zhifeng, et al. Study of transient flow in centrifugal pump during flow impulsively increase process[J]. Journal of Engineering Thermophy-sics,2010,31(3):420-422.(in Chinese)[12]李仁年,刘殿兴,董志强,等.水泵水轮机“S”形区全流道数值模拟[J].排灌机械工程学报,2013,31(5):401-405. Li Rennian,Liu Dianxing,Dong Zhiqiang, et al. Nume-rical analysis of flow in pump-turbine operating in S-shape region[J]. Journal of Drainage and Irrigation Machinery Engineering,2013,31(5):401-405.(in Chinese) |
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