Enhancing fuel distribution of downward steps in supersonic combustion chambers using shock generators

Naser Kamyarpour, Farhad Hosseinnejad, Seyyed Masoud Seyyedi and M. Hashemi-Tilehnoee
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Naser Kamyarpour: Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran
Farhad Hosseinnejad: ��Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran
Seyyed Masoud Seyyedi: Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran‡Energy Research Center, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran
M. Hashemi-Tilehnoee: �Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain

International Journal of Modern Physics C (IJMPC), 2024, vol. 35, issue 11, 1-12

Abstract: This study investigates the impact of a shock generator on the fuel distribution of downward step fuel injection in a scramjet engine’s combustor. Computational simulations of CFD are employed to analyze the three-dimensional structure of multi-jets released in a downward-step configuration. The inlet is subjected to a free stream supersonic flow with Mach=4, while hydrogen gas is injected at Mach=1 through injectors situated on the vertical planes of the downward step. A shock generator with a 30∘ angle is positioned at the top of the domain to induce a bow shock, which significantly affects fuel distribution. The research assesses the influence of free stream and jet pressure on the fuel distribution behind the jets. The results indicate that increasing the free stream flow strengthens the induced bow shock, leading to enhanced fuel jet interactions and improved fuel mixing behind the jets.

Keywords: Downward step; fuel jet; supersonic flow; hydrogen; combustion chamber (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0129183124501481

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