关键词: 可压缩流, 激波/激波干扰, 激波/边界层干扰, 最小熵增准则, 流场结构分析

Abstract:

Shock Wave/Boundary Layer Interactions （SWBLI） are prevalent in both internal and external flow fields of high-speed vehicles， characterized by multi-scale， nonlinear， and unsteady phenomena. These interactions lead to significant local increases in heat flux and pressure， which impact the flow quality and structural integrity of the vehicle. This study provides a comprehensive investigation into the shock structure characteristics and wall pressure rise behavior induced by SWBLI. By analyzing the shock structures in several representative scenarios， the underlying mechanisms of such complex flows are explored. Firstly， the progress of key theoretical models， including the inviscid shock reflection theory， free interaction theory， and minimal viscous dissipation， is reviewed. Subsequently， a comparative analysis is made between two predominant modeling approaches： one is based on boundary layer structures， and the other is based on shock wave interaction structures. Finally， the application of the principle of Minimum Entropy Production （MEP）， an extension of the second law of thermodynamics， to SWBLI-related complex flow fields is discussed. The results indicate that the MEP principle offers substantial advantages when applied to SWBLI flows involving separation. The results obtained using the principle exhibits a high degree of agreement with experimental results in analysis and prediction of both shock structure and pressure rise， thus providing a novel perspective for addressing the fundamental scientific challenges associated with SWBLI.

Key words: compressible flow, shock /shock interaction, shock wave/boundary layer interaction, minimum entropy production principle, flow field structure analysis