Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency
The performances of a dual-combustion ramjet (DCR) and a scramjet were compared via computational fluid dynamics numerical simulation to provide theoretical guidance for engine selection for a hypersonic vehicle. Kerosene, C<sub>12</sub>H<sub>23</sub>, with an equivalence rat...
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/480 |
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| author | Xianju Wu Zhijun Wei |
| author_facet | Xianju Wu Zhijun Wei |
| author_sort | Xianju Wu |
| collection | DOAJ |
| description | The performances of a dual-combustion ramjet (DCR) and a scramjet were compared via computational fluid dynamics numerical simulation to provide theoretical guidance for engine selection for a hypersonic vehicle. Kerosene, C<sub>12</sub>H<sub>23</sub>, with an equivalence ratio of 0.8, was employed as the fuel, and the reactive flow was modeled using six-species and four-step chemistry. The results show that the DCR has a central combustion mode, which has a smaller temperature gradient and more uniform heat release, resulting in higher combustion efficiency, compared to the near-wall combustion mode of the scramjet. The total pressure recovery coefficient of scramjet is 0.9% lower than that of DCR under the Ma6 condition, but 5.6% higher than that of DCR under the Ma7 condition. The combustion efficiency of DCR is 35.6% and 25.4% higher than that of the scramjet under Ma6 and Ma7 conditions, respectively. The decrease in the combustion efficiency of the DCR is caused by the increase in the dissociation rate of CO<sub>2</sub> into CO with the increase in temperature. The performance of DCR is better than that of scramjet under both conditions. However, the performance advantage of DCR decreases as the Mach number increases. Specifically, under the conditions of Ma6 and Ma7, the specific impulse or specific thrust of DCR was 2.67 times and 1.51 times that of scramjet, respectively. |
| first_indexed | 2024-03-11T10:08:09Z |
| format | Article |
| id | doaj.art-baeb36f3ef1041dc94e7f0ce7ce2ba06 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:08:09Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-baeb36f3ef1041dc94e7f0ce7ce2ba062023-11-16T14:57:35ZengMDPI AGApplied Sciences2076-34172022-12-0113148010.3390/app13010480Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion EfficiencyXianju Wu0Zhijun Wei1School of Aeronautical Engineering, Taizhou University, Taizhou 318000, ChinaSchool of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, ChinaThe performances of a dual-combustion ramjet (DCR) and a scramjet were compared via computational fluid dynamics numerical simulation to provide theoretical guidance for engine selection for a hypersonic vehicle. Kerosene, C<sub>12</sub>H<sub>23</sub>, with an equivalence ratio of 0.8, was employed as the fuel, and the reactive flow was modeled using six-species and four-step chemistry. The results show that the DCR has a central combustion mode, which has a smaller temperature gradient and more uniform heat release, resulting in higher combustion efficiency, compared to the near-wall combustion mode of the scramjet. The total pressure recovery coefficient of scramjet is 0.9% lower than that of DCR under the Ma6 condition, but 5.6% higher than that of DCR under the Ma7 condition. The combustion efficiency of DCR is 35.6% and 25.4% higher than that of the scramjet under Ma6 and Ma7 conditions, respectively. The decrease in the combustion efficiency of the DCR is caused by the increase in the dissociation rate of CO<sub>2</sub> into CO with the increase in temperature. The performance of DCR is better than that of scramjet under both conditions. However, the performance advantage of DCR decreases as the Mach number increases. Specifically, under the conditions of Ma6 and Ma7, the specific impulse or specific thrust of DCR was 2.67 times and 1.51 times that of scramjet, respectively.https://www.mdpi.com/2076-3417/13/1/480dual-combustion ramjetscramjetcombustion modecombustion efficiencyspecific impulse |
| spellingShingle | Xianju Wu Zhijun Wei Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency Applied Sciences dual-combustion ramjet scramjet combustion mode combustion efficiency specific impulse |
| title | Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency |
| title_full | Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency |
| title_fullStr | Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency |
| title_full_unstemmed | Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency |
| title_short | Comparison of Dual-Combustion Ramjet and Scramjet Performances Considering Combustion Efficiency |
| title_sort | comparison of dual combustion ramjet and scramjet performances considering combustion efficiency |
| topic | dual-combustion ramjet scramjet combustion mode combustion efficiency specific impulse |
| url | https://www.mdpi.com/2076-3417/13/1/480 |
| work_keys_str_mv | AT xianjuwu comparisonofdualcombustionramjetandscramjetperformancesconsideringcombustionefficiency AT zhijunwei comparisonofdualcombustionramjetandscramjetperformancesconsideringcombustionefficiency |