Conclusions
In the present study we have, for the first time, experimentally observed and investigated an optical discharge in a slow-combustion regime under gas-dynamics conditions close to the one-dimensional (plane) case, when there are no solid objects in the laser beam. We have shown that after the initial acceleration of the plasma there is a stationary regime of propagation of the discharge, characterized by a motion of the discharge front through the gas compressed by a shock wave that moves at high velocity. This regime was observed over an intensity range of 0.4–4 MW/cm2. In this same range we detected deviations from the continuity of discharge propagation (“jumps” of the front). The characteristics obtained for the discharge propagation are in satisfactory agreement with the calculations carried out according to the one-dimensional model. When Iav ≈ 4.3 MW/cm2, we observe a transition to a photodetonation regime.
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Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 22, No. 3, pp. 18–29, May–June, 1986.
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Bufetov, I.A., Fedorov, V.B. & Fomin, V.K. Propagation of an optical flame along a tube. Combust Explos Shock Waves 22, 274–284 (1986). https://doi.org/10.1007/BF00750342
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DOI: https://doi.org/10.1007/BF00750342