Effects of flame jet configurations on detonation initiation
Effects of flame jet configurations on detonation initiation
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DOI：
10.1007/978-3-540-85168-4_37
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Ishii;T. Akiyoshi;M. Gonda;M. Murayama
中科院分区：
文献类型：
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作者：
K. Ishii;T. Akiyoshi;M. Gonda;M. Murayama
对使用火焰喷射的爆燃到爆震转变（DDT）进行了实验研究，以提高脉冲爆震发动机的性能。爆轰管总长7350毫米，内径50毫米。通过改变分室的结构，布置了三种类型的火焰射流：两股火焰射流在管中心碰撞（反向型）、两股火焰射流在爆震管内形成漩涡（偏置型）、一股火焰射流沿爆震管轴向供给（传统型）。测试气体是化学计量的乙炔-空气混合物。实验结果表明，沿与管轴倾斜方向喷出的旋转火焰射流提供最短的DDT时间。 DDT时间随着孔口直径和子室长度的增加而减少。还发现DDT距离不受火焰射流类型的显着影响，并且随着子室长度的减小而略有减小。
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 flame jets were arranged by changing configuration of sub-chamber: 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 the shortest DDT time is provided by a swirling flame jet emanating in the oblique direction to the tube axis. The DDT time decreases with increase in the orifice diameter and length of the sub-chamber. It was also found that DDT distance is not significantly affected by types of the flame jets and slightly decreases with decrease in length of the sub-chamber.