Relationship between secondary separation and surface pressure structure in swept shock-wave/boundary-layer interaction

IF 1.7 4区工程技术 Q3 MECHANICS

Shock Waves Pub Date : 2022-11-01 DOI:10.1007/s00193-022-01102-5

T. Liu, D. M. Salazar, L. J. Mears, A. Baldwin

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引用次数: 2

Abstract

A theoretical analysis is presented to elucidate the relationship between the skin friction topology of the secondary separation bubble and surface pressure structure in the fin-generated swept shock-wave/boundary-layer interaction. This theoretical method is based on the intrinsic relation between skin friction and surface pressure, and the variational method is applied to extract skin friction fields when the boundary enstrophy flux is modeled. The skin friction topology extracted from a surface pressure field in swept shock-wave/boundary-layer interaction is studied as the relevant parameters to surface pressure vary. It is found that the formation of the secondary separation bubble characterized as a topological change of skin friction is directly related to the geometrical features of the surface pressure plateau. The extracted skin friction topology of the secondary separation bubble is compared with computational fluid dynamics results and surface oil visualizations in two examples. The developed method provides a useful tool for understanding of complex flow structures in shock-wave/boundary-layer interactions particularly in pressure-sensitive paint measurements.

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掠面激波/边界层相互作用中二次分离与表面压力结构的关系

本文从理论上分析了翅片产生的扫掠激波/边界层相互作用中二次分离泡的表面摩擦拓扑结构与表面压力结构的关系。该理论方法基于表面摩擦与表面压力的内在关系，在边界熵通量建模时，采用变分法提取表面摩擦场。研究了随表面压力相关参数变化时，从掠面激波/边界层相互作用的表面压力场中提取的表面摩擦拓扑。研究发现，以表面摩擦的拓扑变化为特征的二次分离泡的形成与表面压力平台的几何特征直接相关。在两个算例中，将提取的二次分离气泡表面摩擦拓扑与计算流体力学结果和表面油的可视化结果进行了比较。所开发的方法为理解激波/边界层相互作用中的复杂流动结构提供了有用的工具，特别是在压力敏感涂料测量中。

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来源期刊

Shock Waves 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

审稿时长

17.4 months

期刊介绍： Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.