Interaction of pulsed laser plasma with normal shock In a shock tube

Diankai Wang; Qian Li; Weidong Wang; Lan Li

doi:10.1117/12.2522244

29 March 2019 Interaction of pulsed laser plasma with normal shock In a shock tube

Diankai Wang, Qian Li, Weidong Wang, Lan Li

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110462X (2019) https://doi.org/10.1117/12.2522244
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

With the prominent advantage of high peak power density and easy to break down air to form plasma, nanosecond pulsed laser has an important application value in reducing supersonic wave drag. To reveal the mechanisms of drag reduction by nanosecond pulsed laser, bow shock is simply considered as a normal shock in this paper. The phenomenon of the interaction of laser plasma and normal shock is studied by experiment. A high resolved schlieren system is applied to reveal the complex wave structures. A high speed PIV system is built to measure the velocity and vorticity. Time resolution of the PIV system reaches up to 500ns. Firstly, a nanosecond pulsed laser is focused in the experiment section of the shock tube to form laser plasma. Secondly, laser plasma is impacted by a normal shock in the shock tube. The flow features and evolution of the laser plasma during the interaction are revealed. Research results show that: Under the impact of the normal shock, the high temperature and low density region evolves into an upper and lower symmetric double vortex ring structure, and the size of them increases with the laser energy. The entrainment and contra-flow of the vortex can cause the reduction of the surface pressure of the aircraft, and reform the shape of the bow shock. It is the key flow structure that causes the drag reduction of supersonic vehicle.

Citation Download Citation

Diankai Wang, Qian Li, Weidong Wang, and Lan Li "Interaction of pulsed laser plasma with normal shock In a shock tube", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462X (29 March 2019); https://doi.org/10.1117/12.2522244

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KEYWORDS

Plasma

Pulsed laser operation

Laser energy

High speed cameras

Image processing

Spherical lenses

Velocity measurements

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