Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 29, Pages 16075-16085Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.02.030
Keywords
Backward-facing steps; Fuel mixing; CFD; Fuel jet; Scramjet
Categories
Funding
- Hubei provincial major scientific and technological innovation project, China [2020DEB015]
- Central government guides local science and technology development special project of Hubei, China [2020ZYYD018]
- Hubei province regional innovation and technology project [2020BGC026]
- Scientific Research Project of Huanggang Normal University
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Injecting hydrogen jets to enhance the fuel mixing efficiency of a scramjet engine, a recent study found that under specific conditions, high circulation value can be achieved to improve mixing efficiency.
Increasing the fuel mixing performance in the combustor of scramjet substantially improves the overall efficiency of the scramjet engine. In this article, computational fluid dynamic is used to study the impacts of hydrogen jets injection through the backward facing multi-steps on the fuel distribution and mixing zone at the supersonic air stream of Mach = 4. This study also analyzes the jet flow feature and circulation of jets in different sections of the combustor at downstream of the multi-injectors. Reynolds average NavierStocks equations are solved with SST turbulence model for achieving a precise and acceptable solution. The effects of step height on the jet features are also examined. According to circulation evaluation, low jet total pressure (pressure ratio = 0.1) and high step depth (step depth = 1 mm) is the optimum condition for achieving high circulation value. Our investigations show that the mixing efficiency of the hydrogen multijets improves up to 15% when the step height increases from 0.5 mm to 1 mm. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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