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| Numerical simulation on cavitating flow within jet pump |
| Long Xinping1， Cheng Qian1，2， Han Ning1， Cai Biaohua1，3， Wang Fengjing1 |
| （1.School of Power and Mechanical Engineering, Wuhan University, Wuhan， Hubei 430072, China; 2.State Intellectual Property Office, Beijing 100190， China; 3.Wuhan Second Ship Design & Research Institute, Wuhan， Hubei 430064, China) |
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Abstract Based on Unsteady Reynolds Averaged Navier-Stokes Equation(Urans), the unsteady vapor-liquid two-phase cavitating flow at different cavitation stages within a jet pump of area ratio of 8.16 was calculated. The cavitation process including inception cavitation, developing cavitation and intensive cavitations were all well simulated. Phenomena including the bubble incepting from the jet boundary layer and wobbling downstream with the main flow, bubble spliting, bubble converging, bubble inflating and bubble disappearing were captured. These simulation results are consistent with the experimental observations. The incipient cavitation number is also basically consistent with the experimental data. The simulated distribution of the volume fraction of vapor phase under different outlet pressure and the variation of the cavitation flow ratio indicate that the intensity of cavitation is varied with the outlet pressure of the jet pump when driving pressure and suction pressure are fixed. As outlet pressure decreases, the cavitation flow rate ratio decreases and approaches the real flow rate ratio. Hence, the cavitation is more intensive.
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Received: 30 June 2009
Published: 30 January 2010
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| [1]常近时.水质状况对泵装置空化性能的重要影响[J].排灌机械,2008,26(2):23-26.Chang Jinshi.Important effect of state of water quality on cavitation pressure performance of pump device[J].Drainage and Irrigation Machinery,2008,26(2):23-26.(in Chinese)[2]Lu Hongqi,Shang Hongqi.Mechanism and calculation theory of jet pump cavitation[J].Scientia Sinica:Series A,1987(11):1174-1187.[3]龙新平,关运生,王丰景,等.补气位置对改善射流泵空化性能的试验[J].江苏大学学报:自然科学版,2009,30(3):270-273.Long Xinping,Guan Yunsheng,Wang Fengjing,et al.Experiment on air supplying position for improvement of jet pump cavitation performance[J].Journal of Jiangsu University:Natural Science Edition,2009,30(3):270-273.(in Chinese)[4]龙新平,何培杰.射流泵汽蚀问题研究综述[J].水泵技术,2003(4):33-38.Long Xinping,He Peijie.Review on cavitation within jet pumps[J].Pump Technology,2003 (4):33-38.(in Chinese)[5]Wiesche S.Numerical simulation of cavitation effects behind obstacles and in an automotive fuel jet pump[J].Heat Mass Transfer,2005,41:615-624.[6]蔡标华.射流泵初生空化及其试验研究[D].武汉:武汉大学动力与机械学院,2005.[7]Coutier D O,Fortes P R,Reboud J L,et al.Numerical simulation of cavitating flow in 2D and 3D inducer geo-metries[J].Int J Numer Meth Fluids,2005,48:135-167.[8]Cerutti S,Knio O M,Katz J.Numerical study of cavitation inception in the near field of an axisymmetric jet at high reynolds number[J].Physics of Fluids,2000,12(10):2444-2458.[9]Senocak.Computational methodology for the simulation of turbulent cavitating flows[D].Gainesville,Florida:University of Florida,2002. |
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