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受限流动中激波诱导分离的结构分析-高超边界层专栏

谢祝轩1,杨彦广2,王刚2   

  1. 1. 中国空气动力研究与发展中心超高速所
    2. 中国空气动力研究与发展中心
  • 收稿日期:2021-07-02 修回日期:2021-09-23 出版日期:2021-10-09 发布日期:2021-10-09
  • 通讯作者: 王刚
  • 基金资助:
    国家重点研发计划;中国空气动力研究与发展中心基础和前沿技术研究基金

Structure of shock- induced separation in confined flow

Zhu-Xuan Xie1,YANG YANGUANGGang WANG   

  • Received:2021-07-02 Revised:2021-09-23 Online:2021-10-09 Published:2021-10-09
  • Contact: Gang WANG
  • Supported by:
    National Key R&D Program of China;Foundation and frontier technology research fund of CARDC

摘要: 为了探索内流道中激波/边界层干扰引起的流动分离及其相关的非定常特征,采用RANS方法对马赫6来流下不同宽度、高度的带有20°楔角的矩形内流道流动进行计算,对内流道中分离结构开展了研究,重点关注了内流道下壁面中心区域分离的结构特征,比较了不同几何参数下的流动结构,总结其变化规律并简单讨论了各参数的影响机制。结果表明:内流道中激波诱导的分离具有复杂的三维结构,下壁面中心分离区涡结构呈“Ω”形,并通过两侧的旋风涡与侧壁面附近的分离发生质量交换。在给定来流状态参数的条件下,下壁面分离结构主要受W和H的影响,其中H主要影响侧端分离尺寸及旋风涡与侧壁间距离,W主要影响旋风涡之间的距离。旋风涡之间的相互干扰是中心分离呈现二维特征或三维特征的关键。

关键词: 激波边界层干扰, 受限流动, 分离结构, 几何参数, 高超声速

Abstract: In order to study the flow separation caused by the shock wave/boundary layer interaction in the inner flow channel and its related unsteady characteristics, RANS method is used to calculate the flow in a rectangular channel with a 20° wedge angle with different widths and heights under Mach 6 inflow. Researches on the separation structure in the inner flow channel are carried out, focusing on the structural characteristics of the separation in the center re-gion of the bottom wall, comparing the flow structures under different geometric parameters, summarizing the vari-ation rules and simply discussing the influence mechanism of each parameter. The results show that the separa-tion induced by shock wave in the inner channel has a complex three-dimensional structure, and the vortex struc-ture in the center separation zone of the bottom wall is "Ω"-shaped, and mass exchange with the separation near the side wall occurs through the cyclone vortex of "Ω" vortex. Under the condition of given inflow state parameters, the separation structure of the bottom wall is mainly affected by W and h, where H mainly affects the separation size near side wall and the distance between the cyclone vortex and the side wall, and W mainly affects the dis-tance between the cyclone vortex. The interaction between cyclone vortex is the key to the central separation to pre-sent two-dimensional or three-dimensional features.

Key words: shock wave/boundary layer interaction, confined flow, separation structure, geometry parameters, hypersonics

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