Numerical study on heat and drag reduction by transpiration in hypersonic flow
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 22 May 2023
Issue publication date: 22 June 2023
Abstract
Purpose
The transpiration has been recognized as one of the most effective thermal protection methods for future hypersonic vehicles. To improve efficiency and safety, it is urgent to optimize the design of the transpiration system for heat and drag reduction. The purpose of this paper is to investigate the effects of transpiration on heat and drag reduction.
Design/methodology/approach
A chemical nonequilibrium flow model with the transpiration is established by using Navier–Stokes equations, the shear-stress transport turbulence model, thermodynamic properties and the Gupta chemical kinetics model. The solver programmed for this model is verified by comparing with experimental results in the literature. Effects of air injection on the flow field, the aerodynamic resistance and the surface heat flux are calculated with the hypersonic flow past a blunt body. Furthermore, a modified blocking coefficient formula is proposed.
Findings
Numerical results show that the transpiration can reduce the aerodynamic resistance and the surface heat flux observably and increase the shock wave standoff distance slightly. It is also manifested that the modified formula is in better agreement with the wind tunnel test results than the original formula.
Originality/value
The modified formula can expand the application range of the engineering method for the blocking coefficient. This study will be beneficial to carry out the optimal design of the transpiration system.
Keywords
Acknowledgements
The authors sincerely acknowledge the support from the National Natural Science Foundation of China (Grant No. 92271106).
Citation
Zhao, Y.P., Huang, H., Wu, Q. and Wang, X. (2023), "Numerical study on heat and drag reduction by transpiration in hypersonic flow", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 8, pp. 2815-2852. https://doi.org/10.1108/HFF-08-2022-0461
Publisher
:Emerald Publishing Limited
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