Detonation cell widths of hydrogen/oxygen/helium/steam mixtures were determined in 15 and 30-cm internal-diameter pipes using the smoked-foil technique. The investigations were carried out over a range of initial pressures from 13.3 to 106.6 kPa and at an initial temperature of 105°C. The concentration range investigated included hydrogen concentrations from 10 to 40 percent and steam concentrations of up to 20 percent. The measured cell widths range from about 1 mm to over 100 mm and were in good agreement with those estimated using the calculated values of induction times and post-shock gas velocities.

Issue Section:
Research Papers
Topics:
Diluents, Explosions, Hydrogen, Oxygen, Steam, Electromagnetic induction, Helium, Pipes, Shock (Mechanics), Temperature
1.
Bull
D. C.
,
Elsworth
J. E.
,
Shuff
P. J.
, and
Metcalfe
E.
,
1982
, “
Detonation Cell Structures in Fuel/Air Mixtures
,”
Combustion Flame
, Vol.
45
(
1)
, pp.
7
–
22
.
2.
Kumar
R. K.
,
1990
, “
Detonation Cell Widths in Hydrogen-Oxygen-Diluent Mixtures
,”
Combust. Flame
, Vol.
80
, pp.
157
–
169
.
3.
Lee, J. H. S., Knystautas, R., and Guirao, C., 1982, “The Link Between Cell Size, Critical Tube Diameter, Initiation Energy and Detonability Limits,” Proceedings of the International Conference on Fuel-Air Explosions, University of Waterloo Press, pp. 157–187.
4.
Matsui, H., and Lee, J. H., 1978, “On the Measure of the Relative Detonation Hazards of Gaseous Fuel-Oxygen and Air Mixtures,” Seventeenth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 1269–1280.
5.
Moen, I. O., Murray, S. B., Bjerketvedt, D., Rinnan, A., Knystautas, R., and Lee, J. H., 1982, “Diffraction of Detonation From Tubes into a Large Fuel-Air Explosive Cloud,” Nineteenth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, PA, pp. 635–644.
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