Estimation of the efficiency of gas dynamic protection of the SPRM casing body with an internal-external burning combined charge

The problem of gas dynamic protection of the body of a solid propellant rocket engine with a set-in sequential multigrain charge is considered. For this purpose, the main grain is made as a coaxial cylinder with an outer cylinder made of fuel composition with significantly lower burning temperature. Low-temperature fuel combustion products form a gas-screen along the inner surface of combustion chamber serving as a thermal protection. The inter-grain retainer pad structure provides steady motion of the gas-screen. Results of numerical analysis of efficiency of the selected method of thermal protection of the model engine body for the 2D gas dynamic scenario are given.