超声速预混可燃气流的点火与燃烧

IGNITION AND COMBUSTION OF SUPERSONIC PREMIXED HYDROCARBON FUEL-AIR MIXTURE

在激波风洞一激波管组合设备上开展了碳氢燃料超声速预混可燃气流的点火与燃烧实验研究。实验结果表明:利用激波对燃料进行预热,并以高温燃气作为引导火焰,可以有效缩短汽油空气超声速可燃混气的点火延迟时间,使之缩短到 0.2 ms以下。利用纹影照片对超声速燃烧流场结构作出了分析;研究了超声速预混可燃气流的温度以及当量比对超声速燃烧流场结构、点火与火焰传播特性的影响。

Experimental investigation on ignition and combustion of supersonic premixed hydrocarbon fuel-air mixture has been conducted in the combination facility consisting of a shock tunnel and a shock tube. The experimental results showed that the ignition delay of supersonic premixed gasoline-air mixture could be effectively shortened to less than 0.2 ms through preheating fuel by shock waves and by using hot gas as pilot flame. The structure of supersonic combustion flow field was investigated with the Schlieren pictures. The effects of temperature and equivalence ratio of supersonic premixed combustible flow on the structure of supersonic combustion flow field, ignition and flame propagation were studied.