尖头细长体中小迎角流动结构的数值模拟和实验研究  

Numerical study on flow structure around slender with sharp nose at lower incidences

作　　者：王刚[1] 梁新刚[2] 

机构地区：[1]北京理工大学理学院,北京100081 [2]清华大学航天航空学院,北京100084

出　　处：《实验流体力学》2005年第4期10-15,共6页Journal of Experiments in Fluid Mechanics

摘　　要：利用可压缩层流Navier-Stokes方程模拟了尖头细长体中小迎角的流动结构。给出了4个迎角状态的物面流谱,分析了极限流线随迎角的发展过程;给出了25°迎角的横截面流谱,分析了它们的拓扑特征。展示了由主涡涡对、二次涡对和Tertiary涡对等三重涡组成的完整的涡系结构,强调了Tertiary涡在涡系演化中的意义,及其沿轴向发展过程中迹线的合并与分叉现象。计算与实验结果定性一致。Flow structure around a slender at lower incidences was numerically simulated using time-dependent compressible laminar Navier-Stokes equations. Surface flow patterns at 4 incidences are displayed, the separation process is analyzed. Sectional flow patterns at 25° are presented and their topological characters are discussed. Finally a general three-dimensional structure which composed of main vortex pair, secondary vortex pair and tertiary vortex pair is clearly displayed, a phenomenon of traces join and disjoin while developing downstream is shown, the meaning of tertiary vortex in the development of the main vortex series is stressed. The numerical results are qualitatively consistent with the experimental results.

关 键 词：细长体 涡结构 流型 数值模拟 大迎角空气动力学 

分 类 号：O357.1[理学—流体力学]