氨/氢混合燃料超燃冲压发动机模拟仿真研究

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关键词：超燃冲压发动机；氨燃料；混合燃料

中图分类号：TK4O文献标志码：A

DOI：10.7652/xjtuxb202506001 文章编号：0253-987X（2025）06-0001-10

Numerical Simulation Study of Ammonia and Hydrogen Blends Fueled Scramjet Combustion

LIN Zefeng1，JIANG Xuel，ZHANG Tianqi¹，ZHANG Yingjia' ， HUANG Zuohua1，YAN Yingwen² （1. School of Energy and Power Engineering，Xi'an Jiaotong University，Xi'an 7lo049，China; 2.SchoolofEnergyandPower Enginering，Nanjing Universityof Aeronauticsand Astronautics，Nanjing 21oo16，China）

Abstract： To support the carbon-neutral and sustainable transition to alternative aircraft fuels， numerical simulations of the combustion of ammonia and hydrogen fuel blends in scramjet engines was conducted in this study. A scramjet engine model was developed based on the combustion chamber structure from the German Aerospace Center （DLR）. The model was validated against experimental data under both cold and hot operating conditions. Numerical calculations and combustion characteristic analyses were conducted with varying ammonia blending ratios. The results indicated that an increase in the ammonia mass fraction led to a lower temperature in the reaction field temperature and higher fuel NOx emissions. The low chemical reactivity of ammonia resulted in insufficient combustion in high-speed flow fields，leading to a significant reduction in combustion eficiency compared with pure hydrogen. Simulation results indicated that stable combustion could not be achieved when the ammonia mass fraction increased to 30% under the current conditions. However， the stable combustion boundary can be effectively expanded by increasing the intake pressure，intake temperature，or fuel temperature. This study reveals the combustion characteristics of ammonia and hydrogen fuel blends under supersonic flow conditions， providing insights into the interaction between chemistry and turbulence in supersonic combustion. Additionally，it offers considerations regarding performance prediction for the design and optimization of ammonia-fueled scramjet engines.

Keywords： supersonic scramjet;ammonia fuel;mixed blends

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