Schlieren Visualization of the Energy Addition by Multi Laser Pulse in Hypersonic Flow

Oliveira, A. C.; Minucci, M. A. S.; Toro, P. G. P.; Chanes, J. B.; Myrabo, L. N.
April 2008
AIP Conference Proceedings;4/28/2008, Vol. 997 Issue 1, p390
Conference Proceeding
The experimental results of the energy addition by multi laser pulse in Mach 7 hypersonic flow are presented. Two high power pulsed CO2 TEA lasers (TEA1 5.5 J, TEA2 3.9 J) were assembled sharing the same optical cavity to generate the plasma upstream of a hemispherical model installed in the tunnel test section. The lasers can be triggered with a selectable time delay and in the present report the results obtained with delay between 30 μs and 80 μs are shown. The schlieren technique associated with a high speed camera was used to accomplish the influence of the energy addition in the mitigation of the shock wave formed on the model surface by the hypersonic flow. A piezoelectric pressure transducer was used to obtain the time history of the impact pressure at stagnation point of the model and the pressure reduction could be measured. The total recovery of the shock wave between pulses as well as the prolonged effect of the mitigation without recovery was observed by changing the delay.


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