激光驱动单颗粒与气体混合的实验研究

Experimental Investigation of Mixing Process of Laser-Driven Single Granule with Gas

利用激光驱动技术对微小颗粒进行加载,能够获得较高的颗粒速度,可能成为高速气相流场中气固两相流研究的有效实验手段。利用激光驱动微小金属颗粒模拟高速运动的物体,采用驱动靶优化设计、激光光束调节等方法控制颗粒加速过程,并利用高时空分辨率、高精度瞬态实验诊断技术获取高速颗粒的瞬态物理图像。研究表明,该方法能够有效地发射金属颗粒并获取清晰的高速颗粒物理图像,建立的实验、诊断手段可为进一步开展微喷混合、超燃发动机混合、颗粒高速碰撞以及工业粉尘爆炸等相关研究奠定基础。

Granules can be accelerated to a high velocity using high-power lasers.We applied this technique to the process of mixing granules with gas to investigate the high speed gas-solid two-phase flow transportation.Optimization of target design and adjustment of laser parameters were adopted to control the laser-driven process.Diagnostic tools with high resolving power of space and time were set up to capture the high-velocity granule.The results indicate that the laser-driven launching technique is effective,and the shadow photographs of the high-velocity granule are successfully obtained.The experimental and diagnostic technology can also be used in the research of ejecta mixing,scramjet engine performance,and high-speed impact,dust explosion,and so on.