关键词: 激光推进;圆锥形喷管;相似律;冲量耦合系数

Abstract: Energy law of similitude for laser propulsion refers to that there is an optimum nozzle size for fixed laser energy,making impulse coupling coefficient remaining the largest. A dimensionless factor coupling incident atmosphere altitude,incident laser energy and nozzle geometry parameters is introduced,and energy law of similitude of conical nozzles is created with a single laser pulse and by a laser focusing on a sphere region. The results show that impulse and impulse coupling coefficient firstly increase and then decrease with augment of the dimensionless factor when cone angle is fixed. Impulse increases monotonously with enhancement of incident laser energy,while impulse coupling coefficient is independent of it,when the dimensionless factor is fixed. The authentic and reliable optimum nozzle sizes can be obtained for laser energy.

Key words: Laser propulsion;Conical nozzles;Law of similitude;Impulse coupling coefficient