多相喷雾场中含铝液滴与激光诱导等离子体相互作用机理

宽域吸气式组合推进是未来空天飞行领域的重要发展方向。新型含高能金属煤油和激光点火助燃技术，分别在提升发动机工作性能和实现鲁棒点火稳焰方面有着巨大的潜力，两者的综合应用是目前组合推进方向的研究前沿。本项目拟利用空气伴流喷雾燃烧器结合先进的光学诊断和凝相产物分析手段，开展含纳米铝颗粒煤油的激光点火助燃基础试验研究。从微观时间尺度上研究激光诱导等离子体与含铝煤油液滴相互作用过程，获得多相场中激光击穿混气诱导产生等离子体特性与规律，阐明等离子体爆轰波传播机制和火核的时空演化规律，揭示含纳米铝颗粒煤油液滴在爆轰波及火核作用下的着火机理，进而突破多相喷雾场中含铝液滴与激光诱导等离子体相互作用机理这一关键科学问题。研究成果将为含纳米颗粒煤油燃料在高速空气流中的激光诱导等离子体点火助燃特性研究奠定一定的理论基础，为含高能金属煤油燃料和激光诱导等离子体点火助燃技术在组合动力发动机中的应用起到重要的推动作用。

The wide-speed-range air-breathing combined cycle power is an important development direction in the field of the aerospace flight in the future. New energetic kerosene fuel and laser ignition technology have a great potential in improving the performance of the combined cycle engine and achieving accurate and reliable ignition, respectively. Their comprehensive application is the research frontier in the field of combined cycle propulsion. This project is to carry out the basic experimental research on the laser ignition of the kerosene slurry fuel containing Nano-sized aluminum by means of a supersonic airflow spray burner combined with advanced optical diagnosis and product analysis methods. The ignition process of laser-induced plasma is analyzed on the micro-time scale, and the influence of Nano-sized aluminum particles on the process of laser-induced plasma generation is obtained. The propagation mechanism of the detonation wave and the flow field and the spacial evolution of the flame are revealed. The ignition mechanism of Nano-sized aluminum particles under the influence of the plasma shock wave and the flame kernel diffusion is obtained. The laser-induced plasma ignition mechanism of the slurry fuel containing Nano-sized aluminum particles in the high-speed airflow, which is a key scientific problem, will be broken through. The research results will lay a theoretical foundation for the study of laser-induced plasma ignition and combustion characteristics of the kerosene slurry fuel containing Nano-sized particles, and play an important role in promoting the application of kerosene fuel containing high-energy metals based on the laser ignition in combined cycle engine.