pp. 3009-3020 | Article Number: iejme.2016.246
Published Online: September 07, 2016
Article Views: 656 | Article Download: 701
A mathematical model of optical breakdown at the droplets of dielectric liquid exposed to pulsed laser radiation is developed. The following results are obtained by calculation methods: the distribution of pressure, density and temperature in the vapour aureole of the particle; the temperature field around the droplet of liquid. It has been found that at high energies in the gas bubble, the conditions for thermal ionization of the gas and for the start of electron avalanche, leading to the formation of plasma are created. Due to the volumetric heat generation the droplet overheats and is in a meta-stable state, the plasma formation is almost opaque to radiation, which leads to a sharp rise in temperature. As a result, an explosion occurs inside the droplet, forming a shock wave that propagates outward. The results can be used to assess the performance of high-power scanning lasers (LIDAR) when there are liquid droplets and other suspensions present in the atmosphere. Lasers can be used in fire and explosion safety systems of aerospace machinery. Another area of application is systems of laser ignition and detonation initiation.
Keywords: Fire safety, laser radiation, mathematical modeling, optical breakdown, droplet.
Armstrong, R. L., Zardecki, A., (1990) Propagation of high energy laser beams through metallic aerosols, Applied Optics, 29, 1786-1792.
Astafieva, L. G., Prishivalko, A. P (1998) Heating of solid aerosol particles exposed to intense optical radiation, International Journal of Heat and Mass Transfer, 41, 489-499.
Azarov, M. A., Klimuk, E. A., Kutumov, K. A., Troshchinenko, G. A., Lacour, B. M. (2004) Pulsed chemical HF laser with a large discharge gap, Quantum Electronics, 34, 1023-1026.
Bulat, P. V, Volkov, K. N, Silnikov, M. V, Chernyshov, M. V. (2015) Analysis of difference schemes based on exact and approximate solutions to the Riemann problem. Scientific and Technical Bulletin Information Technologies, Mechanics and Optics, 1(95), 139-148.
Bulat, P. V., Bulat, M. P. (2015) Definition of the existence region of the solution of the problem of an arbitrary gas-dynamic discontinuity breakdown at interaction of flat supersonic jets with formation of two outgoing compression shocks. Research Journal of Applied Sciences, Engineering and Technology, 9(1), 65-70.
Bulat, P. V., Volkov, K. N. (2015a) Simulation of supersonic flow in a channel with a step on nonstructured meshes with the use of the weno scheme. Journal of Engineering Physics and Thermophysics, 88(4), 877-884.
Bulat, P. V., Volkov, K. N. (2015b) Simulation of detonation in particulate systems with applications to pulse detonation engines. Proceedings of the 7th European Combustion Meeting, 31 March – 1 April 2015, Budapest, Hungary. 2015. No. 4252.
Emelyanov, V. N., Volkov, K. N. (2003) Calculation of the threshold power of optical breakdown during interaction between a laser pulse and droplets of dielectric liquid, High Temperature, 43, 344-351.
Emelyanov, V. N., Volkov, K. N. (2004) Simulation of laser- induced detonation in multi-phase mixtures, Proceedings of the 3rd International Symposium on Two-Phase Flow Modelling and Experimentation, 3, (pp. 1655-1665).
Emelyanov, V. N., Volkov, K. N. (2006) Modelling of the interaction of a pulse of laser radiation with a liquid droplet, Journal of High Temperature Material Processes, 10, 141-159.
Frost, D. L., Zhang, F. (2004) Non-ideal blast waves from heterogeneous explosives, Materials Science Forum, 465-466, 421-426.
Kopecek, H., Maier, H., Reider, G., Winter, F., Winther, E. (2003) Laser Ignition of Methane-Air Mixtures at High Pressures. Experimental Thermal and Fluid Science, 27, 499-503.
Kopitin, Yu. D., Sorokin, Yu. M., Skripkin, A. M. et al. (1990) Optical discharge in aerosols. Novosibirsk: Science, 159 p.
Koroteev, N. I., Shumay, I. L. (1991) The physics of high-power laser radiation. Moscow: Nauka, 312 p.
Loskutov, V. S., Strelkov, G. M. (1982) About the explosive evaporation of water droplets under the action of laser pulses at 1.06 and 2.36 microns. Optics and Spectroscopy, 53(5), 888-892
Nigmatulin, R. I. (1987) The dynamics of multiphase media (Part 1). Moscow: Science, 466 p.
Pogodaev, V. A, Rozhdestvenskiy, A. E. (1984) Explosion and weakly absorbing optical breakdown of water sprays in a strong light field. Technical Physics, 53(8), 1541-1546.
Volkov, K. N., Bulat, P. V. (2015) Use of weno schemes for simulation of the reflected shock wave-boundary layer interaction. Journal of Engineering Physics and Thermophysics, 88(5), 1163-1170.
Volkov, K. N., Emelyanov, V. N., Li, Solong (2003) Heat and mass transfer in gas-dispersed systems exposed to intense radiation. Heat Transfer Research, 34(5/6), 38-50.
Zemlyanov, A. A., Kuzikovsky, A. V, Chistyakov, L. K. (1981) On the mechanism of optical breakdown of water by irradiation of targets pulsed CO2 laser radiation. Technical Physics, 51(7), 1439-1444.
Zhang, F. (2009) Detonation of gas-particle flow. Shock Wave Science and Technology Reference Library, 4, 87-168.
Zuev, V. E., Kopitin, Y. D., Kuzikovsky, A. V. (1980) Nonlinear optical effects in aerosols. Novosibirsk: Nauka, 184 p.