关键词: 螺旋爆轰；不稳定度；内部结构；端面胞格；三波点轨迹

Abstract: In order to discover the effects of different pre-mixture gas on spiral detonation inner structure， C2H2+2.5O₂+85%Ar， 2H2+O₂+50%Ar， C2H2+2.5O₂+70%Ar， C2H2+5N2O and CH4+2O₂ experiments were carried out in the tube whose diameter is 63.5mm， and the triple point trajectories were recorded on smoked foils and end-on glasses. Then， single-head， double-head and multi-head of pre-mixtures were analyzed. It is more difficult to form the regular patterns with the instability increasing， because the inner extension pattern of stable pre-mixtures is regular while that of unstable pre-mixtures is hard to be found due to the transverse wave interference. Finally， the records of multi-head were digitalized， and measured the spacing of inner-wall transverse waves and the end-on cell size were measured. The variations of them were calculated. The trends of spacing of inner-wall transverse waves and the end-on cell size are familiar， but the latter one is a bit smaller than the former one. For C2H2+2.5O₂+85%Ar， 2H2+O₂+50%Ar， C2H2+2.5O₂+70%Ar and C2H2+5N2O， the transverse wave spacing reduces from 45.7， 72.7， 47.1 and 24.9 to 10.2， 17.4， 13.2 and 12.1 respectively， and the cell size reduces from 19.6， 19.9， 8.5 and 18.2 to 6.8， 7.1， 4.1 and 5.0， respectively. The dispersion of cell size agrees with that of spacing of inner-wall transverse waves. Meanwhile， the dispersion of cell is higher owing to inner-wall activating molecule decreasing by collision.

Key words: Spiral detonation；Instability；Inner structure；End-on cells；Triple point trajectory