Flow patterns and mixing characteristics of gaseous fuel multiple injections in a non-reacting supersonic combustor |
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Authors: | Sun Ming-bo Lei Jing Wu Hai-yan Liang Jian-han Liu Wei-dong Wang Zhen-guo |
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Institution: | (1) Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha, People′s Republic of China |
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Abstract: | Using the particle-based laser scattering imaging technique, schlieren system and surface oil-flow visualization technique,
the flow patterns and mixing characteristics of multiple injections with tandem multi-orifices and parallel multi-orifices
in a supersonic vitiated air flow were investigated in this paper. All injectors have a declined angle of 30 degree to the
freestream direction. The distance between the tandem orifices and that between the parallel orifices was varied. The experimental
results showed that decreasing the distance between the tandem orifices will reduce the pressure and velocity of the stream
upstream of the second jet, which results in the increase of the penetration height of the second injection and quick mixing
of the whole field. For the small distance between the parallel multi-orifices, the bow shock waves upstream of the injected
jets connect with each other and the air stream entered into the gap between the jets is not enough, resulting in the decrease
of the mixing effect. Large distance between the parallel multi-orifices decreases the interaction between the injection jets.
For the mixing enhancement, there should be a proper optimized distance between the parallel injection orifices. |
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