Investigations on the complex flows induced by dual-swept/dual-ramp wedges in supersonic flows

X Gao,J Y He,S A Liu,W J Tang,G X Xiang,X Huang,X Z Jie

doi:10.1038/s41598-020-66676-5

Abstract

The caret inlet with a dual-swept/dual-ramp configuration has excellent stealth performance and aerodynamic capability. Most previous investigations on this configuration have focused on experiments and numerical simulations but there are relatively few theoretical investigations. In this study, the flow field characteristics of dual-swept/dual-ramp configuration are investigated analytically and numerically. An analytical approach that combines the shock dynamics with a “spatial dimension reduction” was used to analyze the characteristics of the wave structures and state parameters of the flow field. The effects of the sweep angles and inflow Mach number on the flow field characteristics are investigated. The results indicate that the problem of shock/shock interaction in two intersecting wedges of large back-swept angle is a problem of weak shock interaction. Therefore, the theory of weak shock interaction is used to investigate the flow field characteristics, including the uniformity of the flow field and the total pressure recovery performance.

Highlights

The caret inlet with a dual-swept/dual-ramp configuration has excellent stealth performance and aerodynamic capability
As the back-sweep angle is increased to 30° (Fig. 3c,d), the two reflected polars R1 and R2 are completely inside the two incident polars I1 and I2, which indicates that a weak interaction is created
This study investigated the 3D shock/shock interactions (SSI) of two intersecting wedges with back-sweep angles and their applications in caret inlets

Summary

Introduction

The caret inlet with a dual-swept/dual-ramp configuration has excellent stealth performance and aerodynamic capability. He21 studied the wave configuration at the entrance of a caret inlet numerically and investigated the effects of the sweep angle, compression angle, and inflow Mach number on the wave configurations.

Results

Conclusion