Thermodynamic determining method of combustion product of fuel-rich propellant with experiment as restraint

Abstract

The invention provides a thermodynamic determining method of combustion product of fuel-rich propellant with experiment as restraint. The method comprises the following steps: measuring the adiabatic flame temperature of the propellant under certain pressure through an experiment; writing an assumed chemical formula according to the propellant formulation, and creating conservation (mass conservation) equations of the elements; creating an energy conservation equation according to the propellant formulation, the raw material enthalpies of elements of the propellant and the production enthalpies of the ingredients of the combustion product under the adiabatic flame temperature; creating a combustion product free energy function with the ingredient contents of the combustion product as variables, and calculating the minimum value of the combustion product free energy function with the mass conservation equations and the energy conservation equation as restraint so as to obtain the contents of the ingredients of the combustion product. The problem of determining the non-balanced combustion product of the propellant is solved.

Description

technical field [0001] The invention relates to the technical field of combustion testing, specifically a method for determining the thermodynamics of fuel-rich propellant combustion products subject to experiments, which is used for determining the primary combustion products of fuel-rich propellants and provides initial parameters for secondary combustion research. Background technique [0002] In the field of prior art, the combustion temperature, combustion products and thermodynamic characteristic parameters of general propellants are estimated by thermodynamic calculation (GJB). How, what kind of products are produced, according to mass conservation, the total number of mole atoms of each element before and after combustion is equal, a set of mass conservation equations can be established; the composition of combustion products is also related to pressure and temperature, changing the temperature and pressure, the chemical balance of combustion products As the state ch...

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Problems solved by technology

[0006] However, there are still some defects in this method. First, the boron that does not participate in the reaction is determined empirically, which has a certain degree of subjectivity. Secondly, for the burned product, the Gibbs free energy of the composed subsystem has reached Minimal, no more chemical reactions between them

In a system, there is no basis for treating non-equilibrium combustion as subsystem balance, which will inevitably bring errors to the calculation results

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