激光辐射下AP/HTPB复合推进剂低压燃烧特性数值模拟

In order to study the mechanism of laser radiation on low pressure combustion of AP/HTPB com⁃ posite propellant，a two-dimensional sandwich steady-state combustion model was used for numerical simula⁃ tion. The simulation calculation was carried out under the condition of laser radiation intensity of 1.4W/mm² and pressure of 30~90kPa，and compared with the simulation results of self-sustained combustion under the pressure of 130~160kPa. The results show that the burning rate calculated by simulation is basically consistent with the ex⁃ periment，and the maximum error is no more than 4.2%. Under the conditions of laser-assisted combustion and self-sustained combustion，the component diffusion is fast，and the gas phase is premixed structure. Under the laser-assisted combustion condition，the energy of laser radiation makes the reaction near the burning surface more sufficient，the initial diffusion reaction is dominant in the gas phase reaction，and the high temperature re⁃ gion of the gas phase flame is close to the burning surface. Under the self-sustained combustion condition，AP premix reaction and initial diffusion reaction jointly dominate the gas-phase reaction process. The gas-phase flame temperature increases slowly in the direction perpendicular to the combustion surface，and the high temper⁃ ature area is far from the combustion surface. The pressure exponent of laser-assisted combustion is lower than that of self-sustained combustion，and the combustion of propellant is less sensitive to pressure.