连续突扩管流的数值模拟Numerical Simulation of Serial Sudden Expansions Pipe Flow
尹则高,张土乔,黄亚东,吴小刚
YIN Ze-gao~(1;2);ZHANG Tu-qiao~1;HUANG Ya-dong~1;
摘要(Abstract)：
针对二阶连续突扩管流,分析研究了紊动水流运动特点,建立了标准k—ε紊流数学模型,编制了计算程序,并利用物理模型试验资料对其进行了验证;利用模型对二阶连续突扩管流水头损失进行计算,分析结果表明,当中间管段的长径比在3~4左右时,相对水头损失系数最小,可以为连续突扩管道的设计提供相关参考依据。
In the case of two-step serial sudden expansions pipe flow, the characteristic of turbulent pipe flow was studied firstly, the standard k-ε mathematical model and the calculation program were established and verified properly by physical model test data. Based on the computational results of mathematical model, the head loss of serial sudden expansions pipe flow was analyzed and generalized.Results showed that the coefficient of the relative head loss is the least when the aspect ratio of middle section lies in between 3 and 4, which can supply reference to the design of serial sudden expansions pipeline.
关键词(KeyWords)：
连续突扩管流;数值模拟;k—ε数学模型;水头损失
serial sudden expansions pipe flow;numerical simulation;k—ε mathematical model;head loss
基金项目(Foundation): 国家自然科学基金项目(50278088)
作者(Authors):
尹则高,张土乔,黄亚东,吴小刚
YIN Ze-gao~(1;2);ZHANG Tu-qiao~1;HUANG Ya-dong~1;
参考文献(References)：
- [1] Enzo O Macagno,Tin-Kan Hung. Computational and ex-perimental study of a captive annular eddy[J]. Journal ofFluid Mechanics,1967,28:43-64.
- [2] Durst F, et al. Low Reynolds number flow over a planesymmetric sudden expansion [ J]. Journal of Fluid Me-chanics,1974,64:111-128.
- [3] Hanjali K,Jakirli S. Contribution towards the second-mo-ment closure modeling of separating turbulent flows [ J].Computers and Fluids,1998,27(2):137-156.
- [4] Andreas Acrios,Markl Schrader.Steady flow in a suddenexpansion at high Reynolds number[ J]. Physics of Flu-ids,1982,25(6):923-930.
- [5] Frank S Milos,Andreas.Acrios. Steady flow past sudden ex-pansion at large Reynolds number, part-I: boundary layersolutions[J]. Physics of Fluids,1986,29(5):1353-1359.
- [6] Frank S Milos, Andreas Acrios,John Kim.Steady flow pastsudden expansion at large Reynolds number- II, Navier-Stokes solutions for the cascade expansion[J]. Physics ofFluids,1987,30(1):7-18.
- [7] Oliveira P J,Pinho F T. Pressure drop coefficient of lami-nar Newtonian flow in axisymmetric sudden expansions[J]. International Journal of Heat and Fluid Flow,1997,18:518-529.
- [8]华绍曾,杨学宁,等译.实用流体阻力手册[M].北京:国防工业出版社,1985.
- [9]吴持恭.水力学(上册)(第二版)[M].北京:高等教育出版社,1982.
- [10] Shuja S Z,Habib M A.Fluid flow and heat transfer char-acteristics in axisymmetric annular diffusers[J]. Comput-ers and Fluids,1996,25:133-150.
- [11]夏庆福,倪汉根.洞塞消能的数值模拟[J].水利学报,2003,(8):37-42.