Laser induced disturbance with application to a low Reynolds number flow
Abstract
A two-dimensional, unsteady, supersonic, low Reynolds number flow is computationally examined using the full Navier-Stokes equations. A novel technique is discussed for nearly instantaneous generation of a strong volumetric disturbance in the flow. This technique utilizes the pulsed energy from an excimer laser to photodissociate a seed gas. Under prescribed conditions, the excess energy associated with the photodissociation is sufficient for producing a severe disturbance. Because it is possible to control the strength and shape of the disturbance, laser energy deposition may become an important tool in experimental fluid dynamics. The effect of laser energy deposition on an inviscid and two low Reynolds number viscous flows is analyzed. There are large differences between the inviscid and viscous flows, with the latter cases showing the presence of a normal-oblique, unsteady shock wave system and of several flow separation regions.
- Publication:
-
American Institute of Aeronautics and Astronautics
- Pub Date:
- July 1980
- Bibcode:
- 1980fpdy.conf.....E
- Keywords:
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- Flow Distortion;
- Laser Applications;
- Photodissociation;
- Reynolds Number;
- Supersonic Flow;
- Two Dimensional Flow;
- Unsteady Flow;
- Gas Flow;
- Navier-Stokes Equation;
- Optical Thickness;
- Pulsed Lasers;
- Viscous Flow;
- Fluid Mechanics and Heat Transfer