Abstract

Current pulses obtained from detonation plasmas have been measured in order to test for the presence of chemi-ionization in detonation waves. Electric probes have been used to establish the increase in plasma conductance occurring when 0.5 moles % of ethylene is added to an oxyhydrogen mixture. Interpretation of the present results combined with earlier work in which ion concentrations in detonating pure oxyhydrogen mixtures were measured shows (i) that the onset of ionization is speeded up by the addition of ethylene and (ii) that the magnitude of the ion concentration exceeds the thermal-equilibrium value by a significant amount.

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