| Abstract: | We present the results from an experimental study into the dynamics involved in the formation and the unique features of ignition in shock gas suspensions of coal dust with a dispersion of<40  m and a volatile content of 9, 26, and 55%. We have determined the ignition delays  ig for coal dusts in air and in pure oxygen for a range of Mach numbers from 2.6 to 4.0 in an incident shock wave. We have established that the quantity ig as well as the nature of the function ig(1/T) are significantly affected by the kinetics of the volatile yield, in addition to the kinetics of volatile ignition. We have derived an approximation expression for ig as a function of the content of volatiles, the temperature of the medium, and the partial pressure of the oxygen.Novosibirsk. Translated from Fizika Goreniya i Vzryva, No. 2, pp. 101–111, March–April, 1991. |
