• CN:11-2187/TH
  • ISSN:0577-6686

›› 2007, Vol. 43 ›› Issue (12): 229-234.

• 论文 • 上一篇    下一篇

涡流管内三维强旋流流场数值模拟

周少伟;姜任秋;宋福元;张鹏;王朋涛;陈跃进;高超   

  1. 哈尔滨工程大学动力与能源工程学院
  • 发布日期:2007-12-15

NUMERICAL SIMULATION OF THREE-DIMENSIONAL FLOW FIELD WITH STRONG SWIRL IN VORTEX TUBE

ZHOU Shaowei;JIANG Renqiu;SONG Fuyuan;ZHANG Peng;WANG Pengtao   

  1. College of Power and Energy Engineering, Harbin Engineering Universit
  • Published:2007-12-15

摘要: 根据流体在涡流管内流动的强旋流特点,建立涡流管内流体流动的三维物理模型,采用计算流体力学中Realizable –模型对涡流管内流动进行数值模拟,得到切向、轴向与径向流速的分布规律,并对涡流管内部流场的循环流特性进行详细分析。在此基础上,利用量纲一分析方法将数值结果与前人的实测结果加以比较,在一定程度上验证了模拟结果的精确性。数值结果表明,涡流管内的流体流动呈现出复杂的三维流动状态,从旋涡的角度来看,有准自由涡与准强制涡的组合运动;从轴向与切向运动的合成而言,有外旋流与内旋流之分;从径向与切向的综合流动分析,则有所谓的螺旋流存在;就径向与轴向运动的合成而言,则有循环涡流的存在;轴向流速包络面是内外旋气流的分界面,内外旋气流以循环涡流的形式通过轴向零速包络面不断进行传热传质交换。

关键词: 强旋流, 三维流场, 数值模拟, 涡流管, 循环流

Abstract: In order to understand the flow behavior inside the tube distinctly, a three-dimensional physical model of vortex tube is constructed according to flow’s movement characteristic and three-dimensional flow field with strong swirl inside the tube is simulated by the usage of practical “Realizable –” turbulent numerical model. From the simulated velocity field, the distributions of tangential, axial and radial velocity as well as the recirculating flow patterns are investigated. In addition, the strategy of non-dimensional comparisons between numerical results and previous experimental data is applied to validate numerical data indirectly. Satisfactory agreements are observed between them. The numerical results show that flow motion inside the vortex tube presents extraordinary complicated behavior. The swirling flow inside the vortex tube consists of two regions with an outer region of quasi-free vortex flow surrounding an inner region of quasi-forced vortex flow. From view of the composition of axial and swirl motion, the flow inside the tube consists of periphery flow and inner flow. With radial and swirl motion considered, the helical flow exits inside the vortex tube. There is also a recirculating flow inside the tube when the composite motion of radial and axial movement are analyzed. The peripheral and inner flows exchange heat and mass through the enveloping surface of zero axial velocity in the form of recirculating flow because the enveloping surface of zero axial velocity is the interface between peripheral and inner flow.

Key words: Numerical simulation, Recirculating flow, Strong swirl, Three-dimensional flow field, Vortex tube

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