The details of combustion of ammonium perchlorate propellants: Leading edge flame detachment

The transition from particle flamelet burning to premixed flame burning of ammonium perchlorate (AP)/hydrocarbon (HC) binder propellants is identified with detachment of the oxidizer/fuel (O/F) flamelet from the stoichiometri c Lip of the diffusion field over the AP particle. The conditions (pressure , particle area, local stoichiometry) for detachment are revealed by singul ar regions of the burning rate versus pressure curves for selected bimodal propellants.