Lean blowoff behavior of cavity-stabilized flames in a supersonic combustor
Lean blowoff behavior of cavity-stabilized flames in a supersonic combustor
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超音速燃烧室空腔稳定火焰的稀薄吹熄行为
DOI：
10.1016/j.ast.2020.106427
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发表时间：
2020-12
影响因子：
5.6
通讯作者：
Mingbo Sun
中科院分区：
文献类型：
--
作者：
Hongbo Wang;Xiliang Song;Liang Li;Yuhui Huang;Mingbo Sun
进行实验以研究乙烯燃料超燃冲压发动机燃烧器中空腔稳定火焰的近吹熄特性。加热空气进入燃烧室的条件为Ma= 2.52，停滞压力p= 0 1.6 Mpa，停滞温度T 0= 1400 K。利用上游平壁燃油喷射获得了不同尺寸腔体火焰稳定器的稀薄吹熄和点火极限，并通过高速化学发光成像捕获了吹熄附近的火焰结构和动态。虽然流动停留时间被认为随着空腔尺寸的增加而增加，但观察到稀薄点火和吹气极限并不随空腔尺寸单调变化。在相同的喷油条件下，较大腔体内的火焰强度比较小腔体内的火焰强度弱，但残余火焰在较大腔体内的存活时间明显较长。这可能是由于当接近稀薄吹出极限时，较大腔内的混合物较稀薄。因此，存在最适合稀燃吹熄条件下的点火和火焰稳定的最佳腔体尺寸。该最佳空腔尺寸由流动停留时间和局部当量比之间的竞争决定，而局部当量比很大程度上取决于燃料射流与空腔之间的相互作用。
Experiments are performed to investigate the near blowoff characteristics of cavity-stabilized flames in an ethylene-fueled scramjet combustor. Heated air enters the combustor with conditions of Ma= 2.52, stagnation pressure p= 0 1.6 Mpa and stagnation temperature T 0= 1400 K. The lean blowoff and ignition limits are obtained for different-sized cavity flameholders with upstream flush-wall fuel injection, and the flame structures and dynamics near blowoff are captured with high-speed chemiluminescence imaging. Though the flow residence time is believed to increase with increasing cavity size, it is observed that the lean ignition and blowoff limits do not vary monotonically with the cavity size. Under the same fuel injection conditions, the flame intensity in larger cavities is weaker than that in smaller cavities though the residual flame can survive for an obviously longer period in larger cavities. This may be attributed to the leaner mixture within larger cavities when the lean blowoff limits are approached. Thus, there exists an optimal cavity size which is the most suitable for the ignition and flame stabilization near lean blowoff conditions. This optimal cavity size is determined by the competition between the flow residence time and the local equivalence ratio that greatly depends on the interactions between the fuel jet and the cavity.
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