Computational and Experimental Investigation of Supersonic Convection over a Laser-Heated Target

摘要

The cooling effect of a turbulent supersonic boundary layer over a laser-heated flat plate was investigatednexperimentally and numerically. Experiments were in the Virginia Polytechnic Institute and State Universitynunheated supersonic wind tunnel atMach 4. An absorbed laser power between 65 and 120Wwas used, leading to anmaximum heat flux between 10 and 19 MW=m2nat the center of the 4-mm-diam Gaussian beam. The surface andnbackside temperature distributions were measured using a midwave infrared camera and type-K thermocouples.nThe GASP conjugate heat transfer algorithm coupling the Navier–Stokes and the solid conduction equations wasnused to simulate the experiments. The main experimental results were as follows: Asymmetry in the surfacentemperature increases with laser power.Maximumcooling near the beamcenter varies linearly with laser power, innwhich the proportionality constant corresponds to the ratio of convective cooling to laser heating. For both the 65 andn81Wcases, cooling is somewhat underpredicted at the surface near the center, but agreement improveswith distancenand on the backside.