一类变截面管内轴对称螺旋流的衰减规律分析

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

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·

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.