期刊
AEROSPACE SCIENCE AND TECHNOLOGY
卷 120, 期 -, 页码 -出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ast.2021.107255
关键词
Supersonic combustion; Jet-wake flame stabilization; Hybrid LES; RANS; Detailed hydrogen chemistry; Counter-rotating vortex pair
资金
- National Key Project [GJXM92579]
- Departmental General Research Fund (G-UAHP) in the Hong Kong Polytechnic University
This study presented a three-dimensional hybrid LES/RANS approach to investigate jet-wake flame stabilization in a hydrogen-fueled dual-mode scramjet under high inflow stagnation temperature. The results showed that flame stabilization can be divided into different regions based on chemical kinetic and fluid dynamic perspectives.
A three-dimensional hybrid LES (Large Eddy Simulation)/RANS (Reynolds-averaged Navier-Stokes) study dedicated to understanding the jet-wake flame stabilization under high inflow stagnation temperature in a hydrogen-fueled dual-mode scramjet was presented in this paper. The computational method features a finite-rate PaSR (Partially Stirred Reactor) turbulent combustion model with a detailed hydrogen reaction mechanism. The simulation results agreed well with the experimental results on overall characteristics of the jet-wake flame stabilization mode. Furthermore, quantitatively satisfactory predictions were attained for wall pressures. From the chemical kinetic perspective, the jet-wake flame stabilization can be divided into two regions. In the upstream region, both premixed- and non-premixed combustion are responsible for radical production, and the former produces more heat release. In the downstream region, turbulent non-premixed combustion dominates the flame stabilization. From the fluid dynamic perspective, the premixed flame is sustained by the counter-rotating vortex pair in the leeward side of the jet plume, which creates a local region with enhanced fuel/air mixing and reduced local flow velocity. Non-premixed combustion is found in the leeward side periphery of the fuel jet. (c) 2021 Elsevier Masson SAS. All rights reserved.
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