关键词: 激光推进;吸气式;抛物形喷管;相似律;冲量耦合系数

Abstract: Laser supported detonation flow field for parabolic nozzles is computed by solving radiation transport equation and fluid dynamics equations simultaneously, and air model of high-temperature equilibrium gas is used to compute subsequent evolvement of shock wave. Impulse and impulse coupling coefficient for different nozzle sizes under different laser energies are gained. Effect of incident laser energy, nozzle geometry parameters on propulsion performance is discussed. A dimensionless factor is introduced, and energy law of similitude for parabolic nozzles is set up. The results show that when the angle between axis and line connecting apex and exit is fixed, impulse and impulse coupling coefficient firstly increase and then decrease, getting their maximum when the dimensionless factor is about 0.37. When the factor is fixed, impulse and impulse coupling coefficient both decrease with augment of the angle, while impulse increases with enhancement of incident laser energy and impulse coupling coefficient is independent of it.

Key words: Laser propulsion;Air-breathing mode;Parabolic nozzles;Law of similitude;Impulse coupling coefficient