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针对内转式进气道等内收缩流动偏离轴对称状态时所面临的激波汇聚问题,梳理并总结了近年来提出的近轴对称内收缩流动及其相关研究。通过提炼使内收缩流动偏离轴对称状态的几何因素和来流因素,以椭圆形内锥以及非轴向来流中圆形内锥为典型代表,回顾了近轴对称内收缩流动的提出过程。剖析了近轴对称内收缩流动中激波的初始非均匀性以及激波的汇聚与反射等三维激波特性,并梳理了通过“空间降维”将该三维激波汇聚问题等价为二维非均匀内收缩运动激波问题的方法。进一步介绍了结合几何激波动力学发展出的分析该二维等价问题的波面-扰动追踪法及其应用,并展望了未来的研究方向,以期提升对近轴对称内收缩流动中激波汇聚问题的认识。
Abstract:Internal contraction flow represented by hypersonic inward-turning inlet usually deviates from axial symmetry in aerodynamic applications, which leads to complex shock convergence phenomenon. Near-axisymmetric internal contraction flow and its relevant investigations are summarized to understand the shock convergence when the flow deviates from axial symmetry. The origin of two types of near-axisymmetric internal contraction flows are introduced, including the flow generated by an elliptic inner cone which is deviated from the axial symmetry by geometrical configuration, and the flow generated by a circular inner cone at angle of attack which is deviated by incoming flow condition. The characteristics of the three-dimensional shock in the near-axisymmetric internal contraction flows, which refers to the initial non-uniformity, the convergence behaviors and the reflection are analyzed. The scheme of spatial dimensional reduction, by which the three-dimensional shock is equivalently converted into the two-dimensional moving shock is presented. Furthermore,front-disturbance tracking method based on geometrical shock dynamics and its application to the equivalent two-dimensional moving shock are performed. Besides, future work is discussed to enrich the knowledge on the shock convergence in near-axisymmetric internal contraction flow.
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基本信息:
DOI:10.16338/j.issn.2097-0714.20220602
中图分类号:V211.48
引用信息:
[1]姬隽泽,李祝飞,司东现,等.近轴对称内收缩流动中的激波汇聚问题[J],2022,No.445(01):13-26+63.DOI:10.16338/j.issn.2097-0714.20220602.
基金信息:
国家自然科学基金(11872356,11772325,11621202)