Research progress of composite solid propellant with negative pressure exponent
The advantages and research status at home and abroad of negative pressure exponent propellants are summarized.It is pointed out that negative pressure exponent propellants do not have negative pressure exponents throughout the entire pressure range,but only generate negative pressure exponents within a certain pressure range.The formulation systems of negative pressure exponent propellants are summarized.Both polyurethane system propellants and polybutadiene system propellants can generate negative pressure exponent under the action of appropriate additives.The critical factors for generating negative pressure exponent depend not only on the type of binder,but also on the combination of binder and additives.The mechanism of plateau combustion and negative pressure exponent phenomenon occurred in composite solid propellants based on fusible binders is that AP undergoes abnormal combustion of propellants with the catalytic condensation reactions and the reverse vaporization under different coverage conditions.The regulation pathways of negative pressure exponent performance are summarized.The suggestions for developing the expanding research on negative pressure exponent performance of polyurethane system propellants,the research on negative pressure exponent of high energy propellant and HTPB propellant systems,as well as the mechanistic research of negative pressure exponent are proposed.
composite solid propellantnegative pressure exponentformulation system
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