フレームジェットを用いたアセチレン-空気混合気のDDT促進(熱工学,内燃機関,動力など)

概要

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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 7350mm and an inner diameter of 50mm. 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.
社団法人日本機械学会の論文
2007-12-25