Determination of Thermodynamic Characteristics of Combustion Products of Boron-Based Solid Propellants

Testing of model solid fuels based on aluminum dodecaboride AlB_12 revealed a significant difference between the experimental values of the discharge coefficient and the temperature of the primary combustion products in a model gas-generator chamber and their values calculated assuming thermodynamic equilibrium. A computational and experimental method is proposed for determining the thermodynamic characteristics of primary combustion products for model boron-containing propellants with a low oxidizer content ( α < 0.2 ). The method involves experimental measurement of the temperature of combustion products and the discharge coefficient, followed by calculation of the gas constant and the adiabatic index of the combustion products. The ranges of possible values of thermodynamic characteristics and their dependences on pressure are determined.