Penetration and Mixing of Lateral Injected Doublet Liquid Jets in Supersonic Airflow
碩士 === 國立成功大學 === 航空太空工程學系 === 103 === In scramjet engine combustor design, the outcome of liquid fuel injection is a vital issue for engine performance. In a very short residence time, a proper mixing between liquid fuel and supersonic air flow has to be achieved, following by stable combustion whi...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/95821777532804056775 |
| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 103 === In scramjet engine combustor design, the outcome of liquid fuel injection is a vital issue for engine performance. In a very short residence time, a proper mixing between liquid fuel and supersonic air flow has to be achieved, following by stable combustion which also highly relies on the resulted of the mixing effects. The objective of this thesis research is to study the effects of utilizing doublet liquid injections laterally into supersonic airflow on mixing between liquid and air. The experimental study is conducted in a reflected shock tunnel at National Cheng Kung University. The injector is consisted by two orifices and JP-4 fuel is injected into the supersonic airflow. Schlieren photography and Mie scattering are used to observe the flow structure of doublet-jet spray. This injection setup produces interaction between upstream bow shock and downstream bow shock, which enhances the instability of the liquid sprays and the supersonic air flow as well. The results show that the dissipation length of the sprays can be effectively reduced by this double-jet arrangement. Moreover, raising the position of the intersection point of shocks can also increase the penetration height of sprays into the supersonic air flow.
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