Accession Number : AD0632755

Title :   DENSITY INDUCTION TIMES BEHIND SHOCK WAVES IN VERY LEAN MIXTURES OF D2, H2, C2H2 AND C2H4 WITH O2.

Descriptive Note : Scientific rept.,

Corporate Author : GENERAL ELECTRIC RESEARCH LAB SCHENECTADY N Y

Personal Author(s) : White,D. R.

Report Date : DEC 1965

Pagination or Media Count : 36

Abstract : The induction time for shock wave-induced exothermic reaction in lean O2-D2, O2-H2, O2-C2H2, and O2-C2H4 mixtures was measured in the constant area shock tube using optical interferometry. For fuel/oxygen ratios of a few per cent and for 1100 <T<2200K, the gas time from the shock to the first decrease in density is given in moles/liter, seconds, and degrees K. All fuels show essentially the same activation energy (approx. 17.3 kcal/ mole); and with respect to H2, the induction times for D2, C2H2, and C2H4 are about 1.5, 0.5, and 0.4, respectively. The more nearly stoichiometric mixtures show induction times inversely proportional to the geometric mean reactant concentration, and the dependence on the fuel concentration increases with decreasing fuel/O2 ratio, the dependence on (O2) vanishing for the leanest O2-C2H4 mixtures. The vibrationally relaxed but unreacted density is always attained prior to exothermic reaction, and changing the relation time with respect to the induction time has no effect on the latter within the data scatter. (Author)

Descriptors :   (*HEAT OF ACTIVATION, FUELS), SHOCK, IGNITION, DEUTERIUM, HYDROGEN, ALKYNES, ETHYLENES, DENSITY, MIXTURES, OXYGEN, THERMOCHEMISTRY

Subject Categories : Physical Chemistry
      Fluid Mechanics
      Thermodynamics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE