Study on Energy Law of Similitude for Laser Propulsion in Repetitively-pulsed Mode

作     者：Hong Yanjia Cao Zhengrui Li Qian 

作者机构：Department of Basic Theories Academy of Equipment Command and Technology Beijing 101416 China Department of Postgraduates Academy of Equipment Command and Technology Beijing 101416 China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2009年第22卷第6期

页      面：583-589页

核心收录：

学科分类：080703[工学-动力机械及工程] 07[理学] 082502[工学-航空宇航推进理论与工程] 08[工学] 0807[工学-动力工程及工程热物理] 070104[理学-应用数学] 0825[工学-航空宇航科学与技术] 0701[理学-数学] 

基　　金：National Natural Science Foundation of China ( 10672184) National Basic Research Program of China (61328) 

主　　题：laser propulsion law of similitude repetitively-pulsed mode conical nozzle parabolic nozzle impulse coupling coefficient 

摘      要：Energy law of similitude for laser propulsion refers to the law that there is an optimum nozzle configuration for the largest value of impulse coupling coefficient at certain incident laser energy. A dimensionless factor combined with incident laser energy, nozzle configuration parameters and working gas parameters is introduced. Energy law of similitude is established by means of theoretical analysis, experimental study and numerical simulation of radiation gas-dynamics. The qualitative results obtained from theoretical analysis are verified by experimental and numerical results. Physical meaning and engineering application of dimensionless factor and energy law of similitude are analyzed. Results indicate that ① impulse coupling coefficient has a maximurn value with dimensionless factor of about 0.4; ② impulse coupling coefficient is independent of incident laser energy when dimensionless factor is constant. Conclusions and recognitions acquired in this article can not only present optimum nozzle configurations for the present laser energy level, but also provide a good guide for the optimum nozzle configuration design once the laser energy is amplified to a high level.