Effect of free stream angle on mixing performance of hydrogen multi-jets in supersonic combustion chamber. (21st September 2020)

• Record Type: Journal Article
• Authors: Jiang, Yu; Barzegar Gerdroodbary, M.; Sheikholeslami, M.; Babazadeh, Houman; Shafee, Ahmad; Moradi, R.; Li, Zhixiong
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 46(2020)
• Page Start: 25426
• Page End: 25437
• Publication Date: 2020-09-21
• Subjects: Hydrogen multi jets -- Supersonic flow -- Combustion chamber -- Angled free stream -- Computational fluid dynamic; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.055
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The fuel mixing process within the combustion chamber is a critical procedure for advance of scramjet engine. In current study, the influence of free stream angle on the fuel mixing process of multi jets was thoroughly investigated. This research attempts to applied computational technique to disclose the structure of multi-fuel jets when the supersonic air stream is not normal to the jet direction. The effect of both positive and negative supersonic free stream on the diffusion and penetration of multi-hydrogen jets is fully described. The attention of this research is the flow structure of the multi jets and their interaction in the presence of different free stream angle. Our results indicate that the positive free stream angle expands the mixing zone in the downstream while the negative angle of free stream limited jet distribution inside the combustor. Our results show that mixing efficiency increase approximately 50% when the angle of free stream augments from +20° to −20°. According to our findings, mixing efficiency surges up to 17% when the jet spaces are increased from 4Dj to 10 Dj. Highlights: 3-D computational study is performed to study freestream angle on fuel mixing. The influence of free stream angle on mixing was investigated. RANS equations with SST turbulence model are applied for the simulation. The negative free stream angle enhances fuel mixing in downstream. The positive free stream angle increases hydrogen height inside the combustor.