|
|
Numerical simulation of optimal bulb of tubular pump |
Zhou Jiren1,2, Cheng Li2, Liu Chao2, Tang Fangping2 |
(1.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China) |
|
|
Abstract The flow patterns and hydraulic performances of two different bulbs of pump system, i.e. normal type and slin type, were studied. Based on the RNG k-ε model, the SIMPLEC algorithm was applied to the solution of the discretization governing equation. Using multiple reference frames, the flow details of whole pumping systems whose length was of 10.72D, where D was of the impeller diameter, were obtained. The influences of the flow of pump system on difference bulbs were analyzed.The unsuitable design of bulbs caused flow separation and vortex. The calculation results illustrate that the static pressure contours of two pumping systems which were operated at design flowrate, large flowrate and small flowrate, were similar, and therefore the shape of bulb does not impact on the operation status of impllers. The results showed that the flowrate of minimum loss for slin taper bulb is of 112 percent of design flowrate, while that for normal bulb is of 106 percent of design flowrate. It is not quadratic function between flowrate and hydraulic loss, and the loss is somewhat related with the operating region. 3D numerical computation and model test showed that the performance of slin taper bulb was better than that of normal one, and consequently this type of pump system can be applied in the East Route Project of South-to-North Water Transfers.
|
Received: 18 February 2010
Published: 30 January 2011
|
|
|
|
[1]张仁田,邓东升,朱红耕,等.不同型式灯泡贯流泵的技术特点[J].南水北调与水利科技,2008,6(6);6-9.Zhang Rentian,Deng Dongsheng,Zhu Honggeng,et al.Technical features of two bulb tubular pumps[J].South to North Water Transfers and Water Science and Technology,2008,6(6);6-9.(in Chinese)[2]陆林广,陈坚,梁金栋,等.灯泡贯流泵装置的优化水力设计[J].水利学报,2008,39(3):355-360.Lu Linguang,Chen Jian,Liang Jindong,et al.Optimal hydraulic design of bulb tubular pump system[J].Journal of Hydraulic Engineering,2008,39(3):355-360.(in Chinese)[3]秦钟建,伍杰,张仁田.蔺家坝灯泡贯流泵机组水力性能及结构分析[J].排灌机械,2009,27(3):177-180.Qin Zhongjian,Wu Jie,Zhang Rentian.Analysis of bydraulic performance and structure for Linjiaba Bulb Tubular Pump Set[J].Drainage and Irrigation Machinery,2009,27(3):177-180.(in Chinese)[4]Spezial C G,Thangam S.Analysis of an RNG based turbulence model for separated flows[J].International ournal of Engineering Science,1992,30 (10):1379-1388.[5]成立,刘超,汤方平,等.基于RNG紊流模型的立式轴流泵站三维流动数值模拟及性能预测[J].机械工程学报,2009,45(3):252-257.Chen Li,Liu Chao,Tang Fangping,et al.3D numerical simulation and performance predication of vertical axial flow pumping station by RNG turbulent model[J].Journal of Mechanical Engineering,2009,45(3):252-257.(in Chinese)[6]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;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 Science Eduitoon,2006,12(3):273-277.(in Chinese)[7]Akira G,Motohiko N,Takaki S.Hydrodynamic design system for pumps based on 3-D CAD,CAD,and inverse design method[J].Journal of Fluids Engineering,2002,124(2):329-335.[8]van Esch B P M,Kuerten J G M.Direct numerical simulation of the motion of particles in rotating pipe flow[J].Journal of Turbulence,2008,9(4):1-17.[9]Muggli F A,Holbein P,Dupont P.CFD calculation of a mixed flow pump characteristic from shutoff to maximum flow[J].Journal of Fluids Engineering,2002,124(3):798-802.[10]van Each B P M.Performance and radial loading of a mixed-flow pump under non-uniform suction flow[J].Journal of Fluids Engineering,2009,131(5):0511011-0511017. |
|
|
|