Three-dimensional (3D) modelization of shock waves in a high-power pulsed chemical laser

J. Vuillon; David Zeitoun

doi:10.1117/12.204940

31 March 1995 Three-dimensional (3D) modelization of shock waves in a high-power pulsed chemical laser

J. Vuillon, David Zeitoun

Proceedings Volume 2502, Gas Flow and Chemical Lasers: Tenth International Symposium; (1995) https://doi.org/10.1117/12.204940
Event: Gas Flow and Chemical Lasers: Tenth International Symposium, 1994, Friedrichshafen, Germany

Abstract

High-power pulsed lasers in repetitive mode show an output energy decrease of the laser beam. In such lasers, the characteristics time depending on the laser production effect is weak in front to those of the flow. Consequently, the decrease of the output energy is mainly due to the residual pressure and density perturbations, remaining in the laser cavity after the strong electric energy deposition. For a better understanding of the flowfield, a numerical approach is carried out using flux corrected transport algorithms (FCT methods). In previous works, numerical studies of the unsteady 2D flow in both excimer and chemical laser cavity have been presented. The limitations of the 2D modelizations are clearly put in evidence in this paper. The numerical method is extended in order to take into account the optical direction, which has never been modelized and to better understand the 3D flow evolution in the chemical laser cavity. Shock waves travelling in the optical direction, generated by a side effect of the electrodes are clearly put in evidence. These waves have a long time effect on the flowfield and lead to a high residual perturbation level, which is directly responsible of the output laser beam decrease.

Citation Download Citation

J. Vuillon and David Zeitoun "Three-dimensional (3D) modelization of shock waves in a high-power pulsed chemical laser", Proc. SPIE 2502, Gas Flow and Chemical Lasers: Tenth International Symposium, (31 March 1995); https://doi.org/10.1117/12.204940

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