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Modeling Analysis on Cavity-based Flame Stabilization in Scramjet Combustor
Wu K(吴坤)1,2; Zhang P(张鹏)3; Fan XJ(范学军)1,2
Source Publication12th Asia-Pacific Conference on Combustion, ASPACC 2019
Conference Name12th Asia-Pacific Conference on Combustion, ASPACC 2019
Conference DateJuly 1, 2019 - July 5, 2019
Conference PlaceFukuoka, Japan
AbstractTo explore the flame stabilization mechanism in a dual-mode scramjet at low inflow stagnation temperature, the improved delayed detached eddy simulation (IDDES) was conducted. Detailed hydrogen/air combustion chemistry with finite-rate subgrid combustion model was employed to accommodate the involved complex combustion dynamics. The predicted wall pressure agrees well with the experimental data, and both the morphology and the location of the reaction zone were accurately reproduced compared with the measured OH* luminosity. To characterize the cavity-based flame stabilization, the reacting flow in the combustor was analyzed in terms of the shock wave structure and the distributions of temperature and OH radicals. By virtue of the radical evolution and reaction zone analyses, the premixed reaction segment emerging in the cavity shear layer from the cavity leading edge was found to be indispensable in initiating the overall reaction. Essentially, the cavity flame stabilization can be considered as the periodical recirculation of the chemically active radicals associated with the hot reaction products; the thermal chocking at the cavity trailing edge controls the dynamics of the main reaction zone. © Asia-Pacific Conference on Combustion, ASPACC 2019.All right reserved.
KeywordCombustion chemistry Combustion dynamics Dual mode scramjet Flame stabilization Improved delayed detached eddy simulations Overall reactions Scramjet combustors Shock wave structures
Funding OrganizationThe present study is financially supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17030100). The work in the Hong Kong Polytechnic University was supported by NSFC (No. 91641105) and the university matching fund (4-BCE8).
Indexed ByEI
Document Type会议论文
Affiliation1.State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing; 100190, China;
2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing; 100049, China;
3.Department of Mechanical Engineering, Hong Kong Polytechnic University, Hung Hom, Hong Kong
Recommended Citation
GB/T 7714
Wu K,Zhang P,Fan XJ. Modeling Analysis on Cavity-based Flame Stabilization in Scramjet Combustor[C]12th Asia-Pacific Conference on Combustion, ASPACC 2019,2019.
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