Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition
This study proposes a quantitative evaluation framework to assess the performance of boundary layer injection (BLI) technology, establishing standardized metrics for integration into performance analysis of scramjets. We comparatively evaluate inert gas and fuel BLI strategies under typical combusto...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2025-06-01
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| Series: | Propulsion and Power Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212540X25000239 |
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| author | Zhenming Qu Feiteng Luo Yaosong Long Wenjuan Chen |
| author_facet | Zhenming Qu Feiteng Luo Yaosong Long Wenjuan Chen |
| author_sort | Zhenming Qu |
| collection | DOAJ |
| description | This study proposes a quantitative evaluation framework to assess the performance of boundary layer injection (BLI) technology, establishing standardized metrics for integration into performance analysis of scramjets. We comparatively evaluate inert gas and fuel BLI strategies under typical combustor inflow conditions through systematic numerical investigations employing this evaluation framework. Key findings reveal that fuel injection demonstrates superior skin friction reduction efficacy compared to inert gases, especially hydrogen, achieving skin friction reduction performance up to 600 s at Mach 8+ conditions with an injection equivalence ratio (ER) of 0.1. Hydrogen's advantage arises from its inherently low density, coupled with combustion-induced density reduction in the log-law region. This dual mechanism suppresses turbulent momentum transport and attenuates skin friction through large-scale flow restructuring. However, when benchmarked against reacting mainstream flows without BLI, fuel injection efficacy diminishes significantly (100 s level) — local density reduction effects induced by boundary layer combustion are attenuated by mainstream heat release, limiting further momentum transport suppression and reducing drag reduction performance to inert gas levels. These results underscore the critical influence of ambient combustion conditions on BLI effectiveness, emphasizing that BLI implementation must prioritize non-reacting or weakly reacting flow environments. The proposed standardized metrics address this operational dependency, enabling BLI optimization within full-engine design paradigms to prevent counterproductive “pseudo-optimization.'' |
| format | Article |
| id | doaj-art-06a2102c26fa4ee78151dce5096a2617 |
| institution | DOAJ |
| issn | 2212-540X |
| language | English |
| publishDate | 2025-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Propulsion and Power Research |
| spelling | doaj-art-06a2102c26fa4ee78151dce5096a26172025-08-20T02:40:48ZengKeAi Communications Co., Ltd.Propulsion and Power Research2212-540X2025-06-0114227430310.1016/j.jppr.2025.05.003Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow conditionZhenming Qu0Feiteng Luo1Yaosong Long2Wenjuan Chen3School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, ChinaCorresponding author.; School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, ChinaSchool of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, ChinaSchool of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, ChinaThis study proposes a quantitative evaluation framework to assess the performance of boundary layer injection (BLI) technology, establishing standardized metrics for integration into performance analysis of scramjets. We comparatively evaluate inert gas and fuel BLI strategies under typical combustor inflow conditions through systematic numerical investigations employing this evaluation framework. Key findings reveal that fuel injection demonstrates superior skin friction reduction efficacy compared to inert gases, especially hydrogen, achieving skin friction reduction performance up to 600 s at Mach 8+ conditions with an injection equivalence ratio (ER) of 0.1. Hydrogen's advantage arises from its inherently low density, coupled with combustion-induced density reduction in the log-law region. This dual mechanism suppresses turbulent momentum transport and attenuates skin friction through large-scale flow restructuring. However, when benchmarked against reacting mainstream flows without BLI, fuel injection efficacy diminishes significantly (100 s level) — local density reduction effects induced by boundary layer combustion are attenuated by mainstream heat release, limiting further momentum transport suppression and reducing drag reduction performance to inert gas levels. These results underscore the critical influence of ambient combustion conditions on BLI effectiveness, emphasizing that BLI implementation must prioritize non-reacting or weakly reacting flow environments. The proposed standardized metrics address this operational dependency, enabling BLI optimization within full-engine design paradigms to prevent counterproductive “pseudo-optimization.''http://www.sciencedirect.com/science/article/pii/S2212540X25000239ScramjetBoundary layer combustionBoundary layer injectionSkin friction reductionPerformance evaluationHypersonic |
| spellingShingle | Zhenming Qu Feiteng Luo Yaosong Long Wenjuan Chen Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition Propulsion and Power Research Scramjet Boundary layer combustion Boundary layer injection Skin friction reduction Performance evaluation Hypersonic |
| title | Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| title_full | Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| title_fullStr | Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| title_full_unstemmed | Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| title_short | Numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| title_sort | numerical simulation and performance evaluation of skin friction reduction by boundary layer injection under hypervelocity inflow condition |
| topic | Scramjet Boundary layer combustion Boundary layer injection Skin friction reduction Performance evaluation Hypersonic |
| url | http://www.sciencedirect.com/science/article/pii/S2212540X25000239 |
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