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논문 기본 정보

자료유형
학술저널
저자정보
Jinhyeon Noh (Pusan National University) Jeong-Yeol Choi (Pusan National University) Vigor Yang (The Georgia Institute of Technology)
저널정보
한국추진공학회 Journal of Propulsion and Energy Journal of Propulsion and Energy Vol.1 No.1
발행연도
2020.10
수록면
32 - 43 (12page)

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초록· 키워드

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A high-resolution numerical study is carried out to investigate the auto-ignition process of ethylene fuel injection in a direct-connect scramjet combustor. Present study cares about the detailed flow evolution and flame development during the ignition transient. A quasi-global kinetics mechanism, benchmarked against detailed kinetics mechanisms, is employed to model the chemical reactions of ethylene with air in a high-speed environment. Comparing with the hydrogen fuel, the ethylene fuel is more difficult for auto-ignition, regardless of the local temperature and pressure conditions in the flame-anchoring region. The ignition delay often exceeds the flow residence time, and external means are required to achieve self-sustained combustion. As a specific example, the present research employed the air throttling to make a gas dynamic blockage downstream of the combustor. The resultant increase in the flow temperature and pressure, as well as mixing enhancement by the flow speed reduction in the pre-combustion region, greatly improves the ignition efficiency and leads to a stable flame for a while even after the air throttling is deactivated.

목차

1. Introduction
2. Simulation Model and Numerical Approaches
3. Results and Discussion
4. Conclusion
References

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