吸气式激光推进单脉冲性能实验研究

Experimental investigation of single-pulse performance for air-breathing laser propulsion

关键词:  激光推进  吸气模式  单脉冲  冲量耦合系数  推力  流场参数

Key words:  Laser propulsion  Air-breathing mode  Single-pulse  Impulse coupling coefficient  Pressure characteristics  Altitude characteristics

摘要:

利用实验室建立的多种测量系统,组合不同的聚焦及约束条件,广泛进行了吸气式激光推进单脉冲性能实验研究。给出了气压、单脉冲能量和实验件构形对冲量耦合系数影响规律,发现随实验条件变化存在不同的冲量耦合系数稳定区间;测量了单脉冲激光推力加载过程,其持续时间约为170μs,峰值约为200 N;获得了不同约束和不同能量下的流场波系结构,认为激波速度大、有效作用时间长有利于获得高的冲量;进一步综合分析了目前吸气式激光推进的研究局限和发展方向,为重复多脉冲性能研究奠定了很好的实验方法和数据基础。

Abstract:

Experimental investigations of single-pulse performance for air-breathing laser propulsion were carried out with several measurement systems,in which different focus and constraint conditions were employed. Effects of pressure,single-pulse energy and experimental models on the impulse coupling coefficient were pointed out and stable intervals of the impulse coupling coefficient changing with experimental conditions were found.Pulse thrust loading process was measured,whose duration was 170 μs and peak value was 200N.Wave structures of the flow field for different constraints and pulse energy were obtained and higher velocity and longer duration for laser blast wave would can increase the impulse.In the finally,research limitation and development for air-breathing laser propulsion are analyzed,which provide good experimental method and datum for repetitive pulse performance investigation.