Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency
نویسندگان
چکیده
The performances of a dual-combustion ramjet (DCR) and scramjet were compared via computational fluid dynamics numerical simulation to provide theoretical guidance for engine selection hypersonic vehicle. Kerosene, C12H23, with an equivalence ratio 0.8, was employed as the fuel, reactive flow modeled using six-species four-step chemistry. results show that DCR has central combustion mode, which smaller temperature gradient more uniform heat release, resulting in higher efficiency, near-wall mode scramjet. total pressure recovery coefficient is 0.9% lower than under Ma6 condition, but 5.6% Ma7 condition. efficiency 35.6% 25.4% conditions, respectively. decrease caused by increase dissociation rate CO2 into CO temperature. performance better both conditions. However, advantage decreases Mach number increases. Specifically, conditions Ma7, specific impulse or thrust 2.67 times 1.51 scramjet,
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ژورنال
عنوان ژورنال: Applied sciences
سال: 2022
ISSN: ['2076-3417']
DOI: https://doi.org/10.3390/app13010480