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Applied Optics

Applied Optics


  • Vol. 20, Iss. 13 — Jul. 1, 1981
  • pp: 2239–2242

Ignition-delay times in laser initiated combustion

Ronald A. Hill  »View Author Affiliations

Applied Optics, Vol. 20, Issue 13, pp. 2239-2242 (1981)

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A single pulse from a TEA CO2 laser is used to heat 1:7:14 mixtures of SF6:CH4:O2 to temperatures near 1000 K. A short- or long-duration pulse (one-half the energy deposited in 0.25 or 0.82 μsec, respectively) from a second TEA CO2 laser is used to ignite the mixture. At comparable values of absorbed energy from the second laser, ignition-delay times for the long-duration secondary pulse are approximately twice those for the short-duration pulse. Ignition of the hot mixture requires about 10% less absorbed energy with the short-duration pulse than with the long-duration pulse. These results indicate the short-duration pulse is more effective in producing a high population density of reactive species that initiate the reactions necessary for ignition.

© 1981 Optical Society of America

Original Manuscript: January 12, 1981
Published: July 1, 1981

Ronald A. Hill, "Ignition-delay times in laser initiated combustion," Appl. Opt. 20, 2239-2242 (1981)

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  1. R. A. Hill, G. A. Laguna, Opt. Commun. 32435 (1980). [CrossRef]
  2. Supplied by the Harshaw Chemical Co.
  3. JANAF Thermochemical Tables, NSRDS-NBS 37, (1971).
  4. J. F. Swegle, “TOODY IV, A Computer Program for Two-Dimensional Wave Propagation,” SAND78-0552, Sandia National Laboratories, Albuquerque, N. Mex. (1978).

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