Experimental study on flow structure and flame development in a hydrogen-fueled supersonic combustor
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摘要: 采用试验方法研究了不同当量比条件下的氢气燃烧流场结构和火焰传播规律。采用壁面测压、纹影、差分干涉、火焰自发光照相以及OH-PLIF等测量手段获取流场信息，并发展了纹影、差分干涉和PLIF同步测量的试验方法，获取了流动结构和火焰的耦合测量结果。结果表明：在所研究的5个状态中，当氢气当量比大于0.17时，燃烧流场结构不稳定，火焰分布呈现破碎状，火焰在燃烧室上下壁面之间来回传播；当氢气当量比小于或等于0.17时，燃烧流场结构稳定，火焰呈现连续分布，火焰稳定分布于凹槽下部剪切层内。Abstract: The flow structure and flame development were studied experimentally in a hydrogen-fueled scramjet combustor. Wall pressure measurement, schlieren, differential interferometry, high-speed framing of flame luminosity and OH-PLIF (planar laser-induced fluorescence) were introduced to characterize the combustion flow. The synchronous measurement path diagram of schlieren, differential interferometry and PLIF was developed in this study, and the coupling results of flow structure and flame were obtained. The results show that:in the five studied cases, the combustion flow structure is unstable when the equivalent ratio of hydrogen is greater than 0.17. The fragmentation flame spreads in the flow between the top and bottom wall. When the equivalent ratio of hydrogen is less than 0.17, the continuum flame is stable and located in the cavity shear layer.
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Key words:
- scramjet combustor /
- equivalent ratio /
- flow structure /
- oscillation
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图 2 纹影与PLIF系统同步测量光路
Figure 2. The synchronous measurement path diagram of schlieren and PLIF
图 7 Case 2不同时刻燃烧流场的差分干涉图片
Figure 7. Differential interferometry figures of case 2 at different times
图 8 Case 3不同时刻燃烧流场的差分干涉图片
Figure 8. Differential interferometry figures of case 3 at different times
图 9 Case 2不同时刻燃烧流场的侧板直接照相图片
Figure 9. Flame luminosity figures of case 2 at different times
图 10 Case 3不同时刻燃烧流场的侧板直接照相图片
Figure 10. Flame luminosity figures of case 3 at different times
图 11 Case 2和3某时刻燃烧流场的底板直接照相图片
Figure 11. Flame luminosity figures of case 2 and 3 (taken from bottom wall)
图 12 Case 2和3状态下的OH*-PLIF照片
Figure 12. OH*-PLIF figures of case 2 and 3 at different times
图 13 多种光学测量手段的合成结果
Figure 13. The synchronous measurement pictures of several measurement methods of case 2 and case 3
表 1 各研究状态
Table 1. The studied cases
Case Equivalent ratio Flux/(g·s-1) 1 0 0 2 0.10 8.76 3 0.30 26.28 4 0.04 3.504 5 0.17 14.892 6 0.23 20.148 
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