Abstract
Abstract : The influence of initial temperature (T(o) = 195K and T(o) = 295K) on the limits of detonability of gaseous detonations was investigated for mixtures of CH4 - O2, H2 - O2, and H2 - air at one atmosphere initial pressure in long tubes of 4, 6, 10, 16 and 26 mm inner diameter, respectively, by use of a rotating drum camera. Two experimental designs are described to measure these limits at low initial temperatures. The regime of fuel gas concentrations for stable detonations becomes somewhat narrower at lower initial temperatures. The influence of the initial temperature on the critical tube diameter is estimated. Furthermore, the applicability of the Chapman-Jouguet theory is discussed in relation to shock wave configurations, i.e. the Mach triple configuration. The essential arguments for the existence of the limits of detonability are discussed. Finally, a new method to estimate the limits of detonability with a very simple experimental arrangement is described. By this method experiments concerning the stability of a detonation and its initiation process are linked together.
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