Thermo-chemical non-equilibrium flows and aerodynamic loads of Type III shock/shock interaction on blunted lip of a Mach 12 inlet

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-03-26 DOI:10.1016/j.ast.2025.110168

Dengke Li , Bo Sun , Chunliang Dai , Xiong Chen , Yanjin Man

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引用次数: 0

Abstract

The aerothermal challenges are often accentuated by shock/shock interactions (SSI) in the hypervelocity flow. Due to the small scale, the blunted inlet lip is likely to encounter an extremely harsh thermal environment among the components of an airbreathing vehicle. In the present study, an open-source solver named hy2Foam is used to obtain the unexplored flow characteristics of small-scale Type IIIa SSI at Mach 12 with incident shock angle

β

12^{\circ}

15^{\circ}

and

18^{\circ}

. The transition from Type III to Type IV SSI is observed with the increase of dimensionless intercept

I_{r}

. Different from the results in the previous study, the shear layer in Type IIIa SSI doesn't directly attach but deflects twice before the final attachment. This phenomenon stems from the coupling between the shear layer attachment process and the shock wave/shear layer interaction. As

I_{r}

increases, the Mach reflection (MR) within Type IIIa SSI can transform to regular reflection (RR) owing to the decrease of the first deflection angle of shear layer, and the flows remain steady during the transition process from Type IIIa SSI to Type IV SSI. The flow within a valley region between the shear layer and the cylinder surface is the closest to thermal equilibrium and chemical equilibrium in the whole flow field. Due to the strong recompression shock generated by the final attachment of the shear layer, the peak of pressure and heat transfer at the critical state transitioning from Type IIIa to Type IV SSI is the highest for Type IIIa SSI, achieving 30.8 and 40.08 times to the stagnation values in undisturbed flow, respectively. Finally, a new power-law correlation between pressure and heat transfer intensifications for Type III SSI on the blunted lip of a Mach 12 inlet is obtained. Those insights in this research are poised to provide a reference for the thermal protection design of high Mach number inlets.

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.