Establishment of the Primary Combustion Model of Fuel-rich Solid Propellant with Agglomerated Boron Powder

In order to study the effect of agglomerated boron powder on the energy release and burning rate characteristics of boron-based fuel-rich solid propellant,the physical and mathematical combustion models of this propellant were established based on the experimental analyses and BDP model.The combustion surface of the model makes up of two parts,agglomerated boron powder and conglomeration regions of AP,HTPB binders.The AP flame and final flame conglomeration regions are formed in gas phase,and the binder of agglomerated boron powders participates in pervasion flame and final flame.On the assumption that agglomerated boron powder is an inert substance in primary combustion,the mathematical model of fuel-rich solid propellant with agglomerated boron powders is put forward.By predigesting the AP/HTPB and agglomerated B/AP/HTPB system,the SAP/S expression of burning rate formulation is deduced.The effect of the volume fraction ζ1 of agglomerated boron powders on the combustion surface of propellants is considered adequately in the model,and the volume factor of agglomerated boron powders is introduced to the mathematical model.The model can reasonably explain the main combustion characteristics of this propellant.