Cellular Property of the Detonation Wave of Pre-mixed Methane-Oxygen in Annular Tube

In order to investigate the detonation propagation in the annular tube, the experiments are conducted with methane-oxygen mixture. Annual tubes with different inner diameter D₀ were configured and smoked foils were fixed on both outer wall and the inner wall of the annular tube to record the detonation structure. Firstly, it is found that transverse wave modes on both outer wall and the inner wall of the annular tube increase with increasing initial pressure and inner diameter of the channel. In addition, the measurement of angle between the transverse wave and the tube axis disagrees acoustic theory within the error range. In the results, the angle and the cell size changes less with pressure and more with different position of the channel, demonstrating the strongly dependence of the tube geometric. What’s more, the trajectories of right-running transverse wave were traced and some of the transverse waves disappeared in the polycarbonate tube, because the initial energy of different transverse waves are different and the energy required to sustain the transverse vibration of spinning detonation must be derived from the chemical energy release at the front.