STRUCTURE AND MULTIPLICITY OF DETONATION REGIMES IN HETEROGENEOUS HYBRID MIXTURES

The problem of propagation of steady nonideal detonations in heterogen eous hybrid mixtures is studied in the case of a hydrogen-air gaseous mixture with suspended fine aluminum particles. Due to the difference in the order of magnitude of the characteristic induction and combusti on times of gaseous mixture and solid particles, the process of energy release behind the leading shock front occurs over an extended period of time and in a nonmonotonic way. An approximate numerical model has been improved to find the steady propagation regimes and investigate their structure. The problem is analyzed in the frame of the theory of the mechanics of multiphase media with mass, momentum and heat exchan ges between particles and gases. The one-dimensional ZND model of deto nation with losses to the lateral boundaries is used. It is shown that three different steady propagation regimes may exist: the Pseudo-Gas Detonation (PGD), the Single-Front Detonation (SFD) and the Double-Fro nt Detonation (DFD). The numerical results match the available experim ental results obtained previously. The influence of the fundamental pa rameters of the system on the domains of existence of the different re gimes is displayed. Moreover, it is shown that, according to the theor y of nonideal detonations with nonmonotonic energy release, there may exist a multiplicity of detonation modes. However, the total number of solutions actually obtained by numerical calculations differs from th at predicted by the theory. The reasons for these discrepancies are di scussed.