空气动力学学报2018，Vol.36Issue(2)：265-272,8.DOI:10.7638/kqdlxxb-2018.0026
高超声速椭圆锥短轴流向涡的二维全局稳定性分析
Bi-Global instability of streamwise vortices near minor-axis of hypersonic elliptic cone
摘要
Abstract
In wind tunnel experiment,transition location near minor-axis of hypersonic elliptic cone is quite different from that on each side.This is due to the streamwise vortices near minor-axis,which lead to significant difference of basic flow from that on each side.Consequently,instability near minor-axis has essential difference from that on each side,resulting in different transition locations.In this paper,Bi-Global instability analysis is carried out to investigate the instability near minor-axis.Arnoldi method is employed,and the numerical results are validated by comparing with those calculated through other methods.Unstable outer modes are found,and the variation of their growth is studied against frequency,wavenumber,and streamwise location.The physical mechanism of unstable modes is found that they are caused by inviscid inflection instability of shearing basic flow.Unstable inner mode does not exist,because there is no Fjortoft inflection point corresponding to inner mode characteristic.关键词
高超声速椭圆锥/二维全局稳定性/外模态/内模态Key words
hypersonic elliptic cone/Bi-Global instability/outer mode/inner mode分类
数理科学引用本文复制引用
李晓虎,张绍龙,刘建新,黄章峰,罗纪生,张永明..高超声速椭圆锥短轴流向涡的二维全局稳定性分析[J].空气动力学学报,2018,36(2):265-272,8.基金项目
国家重点研发计划项目(2016YFA0401200) （2016YFA0401200）
国家自然科学基金(11672204,11672351,11332007,11402167) （11672204,11672351,11332007,11402167）
