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Numerical investigation of heat flux distribution in a deep gap based on chemical equilibrium

Guo Huang (Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing, China)
Haiming Huang (Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 7 August 2017

Abstract

Purpose

The purpose of this paper is to perform the simulation to explore the gap flow field under a hypersonic air flow. Thermal protection systems of hypersonic vehicles generally consist of thermal insulation tiles, and gaps between these tiles probably cause a severe local aerodynamic thermal effect.

Design/methodology/approach

The discretizations of convection flux term and temporal term in the governing equation with chemical equilibrium, respectively, take AUSM+-up flux-vector splitting scheme and the implicit lower-upper symmetric Gauss–Seidel method. Based on these, the flow field in a deep gap is simulated by means of the computer codes that the authors have written.

Findings

The numerical results show that the heat flux distribution in a gap has a good agreement with experimental results. Importantly, the distribution of heat flux is “U” shaped and the maximum of the heat flux occurs at the windward corner of a gap.

Originality/value

To explore the gap flow field under a hypersonic air flow, which is a chemically reacting, all speed and viscous flow, a novel model with an equivalent ratio of specific heats is presented. The investigation in this paper has a guide for the design of the thermal protection system in hypersonic vehicles.

Keywords

Citation

Huang, G. and Huang, H. (2017), "Numerical investigation of heat flux distribution in a deep gap based on chemical equilibrium", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 8, pp. 1662-1674. https://doi.org/10.1108/HFF-03-2016-0119

Publisher

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Emerald Publishing Limited

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