1 Simulation of High-Temperature Pressurization of the Liquid-Propellant Rocket Tanks

Paper presents the description of the mathematical model of the high-temperature pressurization of liquid propellant tanks based on the concept of chemical kinetics. Chemical non-equilibrium approach provides the possibility to calculate the performances of any pressurization system including chemical pressurization. The examples of the application of the model to the numerical simulation and optimization of the parameters of the pressurization systems are illuminated. Nomenclature ijν ′ and ijν ′ ′ = stoichiometric coefficients for substance “i ” in the right-hand and left-hand parts of the equation of chemical reaction “j ” correspondingly refiH = reference value of molar enthalpy of substance “i” iH = molar enthalpy of substance “i” jK = rate constant of chemical reaction “j” jk, jk = rate constants of forward and reverse chemical reaction “j ” correspondingly jm = the indicator of the participation of third particle M in the reaction “j ” (if jm =1 the reaction includes third particle, otherwise jm = 0) ns = total number of species s m = number of the reversible chemical reactions r = number of non-reversible chemical reactions P = pressure T = temperature in the reactor ri = molar fraction of substance “i” V = volume iV = volume of the reactor “i” refipC = reference value of molar specific heat of substance “i” refT = reference value of the temperature h = specific enthalpy per unit of mass in the reactor μi = molecular mass of the specie “i” I