Abstract
Temperature profiles behind detonation waves have been measured by the emission-absorption method using the integrated radiation over a large number of rotational lines of the fundamental vibrational band of OH at 306.4 nm. The lower temperature limit of the method is determined by the gas radiance and for oxyhydrogen detonations, at subatmospheric initial pressure; this is around 2600K, whereas the upper limit at which the method was tested is 4000K in oxyacetylene waves. The estimated error of the measurements is +or-2.6%. In the two systems studied good agreement is found between the observed values and those computed by the one-dimensional Chapman-Jouguet theory. Measurements are also described of the temperatures behind the shock wave formed by the normal reflection of a detonation wave at the closed end of the tube and also of the secondary shock wave which is found to occur, under certain conditions, in an overdriven detonation wave.
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