Journal
AEROSPACE SCIENCE AND TECHNOLOGY
Volume 105, Issue -, Pages -Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ast.2020.106035
Keywords
Scramjet; Hydrogen mixing; Supersonic flow; CFD; Multi jets
Categories
Funding
- NSFC [51979261]
- Fundamental Research Funds for the Central Universities [201941008]
- Applied Fundamental Research Project of Qingdao [2019-9-1-14-jch]
- Australian Research Council [DE190100931]
- Fujian Province Natural Science Foundation [2018J01506]
- Australian Research Council [DE190100931] Funding Source: Australian Research Council
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Penetration and distribution of fuel inside the supersonic combustor significantly influence on the overall performance of the scramjet. This research employed the numerical technique to examine the mixing performance of the multi-hydrogen jets at supersonic airflow when the downstream step exists in the downstream of the jet. CFD simulations are conducted to disclose the feature of multi jets when a downstream step is applied. The effects of back step height, free stream Mach number and fuel jet pressure on the mixing efficiency of the four hydrogen jets are disclosed. Our study indicates that decreasing the back step height from 3 mm to 1.5 mm increases the mixing rate up to 28% in downstream of the multi jets. Besides, the formation of the normal shock in upstream of the jet reduces fuel mixing while the normalized mixing factor of fuel jets enhances in downstream of injectors. (C) 2020 Elsevier Masson SAS. All rights reserved.
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