Effect of operation pressure on heat release characteristics in solid rocket motor nozzle considering detailed chemical reaction mechanism

Abstract

In order to obtain the effect of operation pressure on the heat release characteristics in the nozzle of solid rocket motor, and provide an accurate gas action boundary for the establishment of dynamic ablation model of flexible nozzle, numerical simulation is conducted to quantitatively analyze the effect of operation pressure on the heat release characteristics in the nozzle of solid rocket motor in terms of reaction increase rate and reaction progress in this paper. Results demonstrate that: 1) based on the motor configuration and propellant, the change of operation pressure has no effect on the position of the dividing point between equilibrium state and nonequilibrium state, which is located at the convergence section 0.13 m from the nozzle inlet. 2) With the increase of operation pressure, the reaction increase rate and reaction progress of temperature and H2O at the corresponding axial position in the mainstream area increase as a whole, while the reaction increase rate and reaction progress of CO2 decrease as a whole. 3) Compared with the mainstream, the reaction increase rate and reaction progress of temperature and CO2 at the wall increase as a whole, while the reaction increase rate and reaction progress of H2O decrease as a whole.