一类变截面管内轴对称螺旋流的衰减规律分析

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The Decay of Swirling Flows in a Type of Cross-Section-Varying Pipes

Department of Mechanics and Engineering Science, Peking University, Beijing 100871, P R China

摘要: 针对一类变截面管内的轴对称弱螺旋流情况,讨论了其沿下游的演变规律.对于层流情况得到了指数衰减性的结论.对于湍流情况,则在Boussinesq涡粘性假设下得到了局部环量放大的必要条件.
- 螺旋流 /
- 衰减 /
- 流动分析
Abstract: The decay of weakly swirling flows in a type of cross-section-varying pipes was discussed analytically.For laminar swirling flow,the feature of exponential decay was demonstrated.For turbulent swirling flow,in spite of the decay of circulation flux,a necessary condition for local circulation to amplify along downstream was obtained under the Boussinesq's hypothesis.
- swirling flow /
- decay /
- analysis of fluid flows

[1]	熊鳌魁,齐东文,魏庆鼎.渐变截面圆管道内粘性流动的相似性解[J].力学与实践,1999,21(1):34-36.
[2]	Ward-Smith A J.Internal Fluid Flow:The Fluid Dynamics of Flow in Pipes and Ducts[M].Ox-ford:Clarendon Press,1980.