Abstract
AbstractThis paper reports that the presence of liquid impurity significantly affects the shock wave structure induced by laser-induced gas breakdown in a quiescent gas. A spherical blast wave is formed when there are no suspended liquid particles, whereas an elliptic shaped blast wave appears in gas breakdown with the presence of suspended liquid particles. The elliptic shaped blast wave has a higher overpressure magnitude on the perpendicular axis of the laser path.
Highlights
Laser-induced gas breakdown has the ability to change the flow characteristics due to rapid local heating
The laser beam may interact with atmospheric aerosols including liquid and solid particles when laser-induced gas breakdown is applied to energy addition around an aircraft
Different shock wave formation/propagation are apparent in laser-induced gas breakdown with and without particles
Summary
Laser-induced gas breakdown has the ability to change the flow characteristics due to rapid local heating. The local high temperature induces the generation of plasma and a spherical blast wave, and a vortex ring is formed due to the asymmetric shape of the plasma region in the laser focal position [1]. According to both numerical and experimental investigations of laser energy addition ahead of a bow shock wave [2, 3], the high-temperature region and the vortex ring both contribute to a drag reduction. The laser-induced gas breakdown can be used in engineering applications such as flow control [4] as well as laser plasma igniters [5]. The thermal structure from laser-induced breakdown will be altered by the interaction with atmospheric
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