To achieve practical uses of large bore Pulse Detonation Engines, the authors have proposed the enhanced reflection type detonation initiator. Here, successful transmission from a planar detonation wave in a predetonator to a self-sustainable expanding cylindrical detonation wave at a cylindrical path is a key issue. In a previous single-cycle research, the authors revealed that the necessary overfilling radius of the driver gas (stoichiometric H2-O2 mixture) to initiate a cylindrical wave is 75 mm. The aim of this study is to investigate the effect of multi-cycle operation condition on the transmission to a cylindrical detonation wave. The result shows that a planar detonation wave with theoretical CJ speed is formed but a cylindrical detonation wave is not formed at any overfilling radius from 50 to 175 mm. Soot track records at the cylindrical path surfaces and a mixing analysis of driver and target mixtures using ANSYS FLUENT strongly indicate that residual nitrogen gases at the exit of the predetonator have a negative effect on the transmission.
内容記述
形態: カラー図版あり
内容記述(英)
Physical characteristics: Original contains color illustrations