Existence of the detonation cellular structure in two-phase hybrid mixtures

Abstract.

The cellular detonation structure has been recorded for hybrid hydrogen/air/aluminium mixtures on 1.0 m $\times$ 0.110 m soot plates. Addition of aluminium particles to the gaseous mixture changes its detonation velocity. For very fine particles and flakes, the detonation velocity is augmented and, in the same time, the cell width $\lambda$ diminishes as compared with the characteristic cell size $\lambda _0$ of the mixture without particles. On the contrary, for large particles, the detonation velocity decreases and the cell size becomes larger than $\lambda _0$. It appears that the correlation law between the cell size and the detonation velocity in the hybrid mixture is similar to the correlation between the cell size and the rate of detonation overdrive displayed for homogeneous gaseous mixtures. Moreover, this correlation law remains valid in hybrid mixtures for detonation velocities smaller than the value D$_{\rm CJ}$ of the mixture without particles.