Promotion of Detonation Initiation of Acetylene-Air Mixtures Using Flame Jet
Promotion of Detonation Initiation of Acetylene-Air Mixtures Using Flame Jet
复制标题
使用火焰射流促进乙炔-空气混合物的爆轰引发
DOI：
10.1299/kikaib.73.2572
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Murayama
中科院分区：
文献类型：
--
作者：
K. Ishii;T. Akiyoshi;M. Gonda;M. Murayama
Deflagration-to-detonation transition (DDT) using flame jets was experimentally studied to improve performance of pulse detonation engines. The detonation tube has a total length of 7350 mm and an inner diameter of 50 mm. Three types of configuration of sub-chambers supplying flame jets were arranged : two flame jets colliding at the tube center (counter type), two flame jets forming a swirl inside the detonation tube (offset type), and one flame jet supplied in the axis direction of the detonation tube (conventional type). Test gas was a stoichiometric acetylene-air mixture. The experimental results show that early emanation of the flame jet is more effective to achieve the shortest DDT time rather than formation of a strong shock wave owing to higher jet velocity. For reduction of time from the jet emanation to detonation initiation, the flame jet supplied into wider space, which is given by the offset type and the conventional type, is superior to the counter type causing local enhancement of turbulence by mutual jet collision. With reference to the offset type, formation of swirling flame generated by jet emanation in the oblique direction to the tube axis has good performance for promotion of DDT process.
