Abstract
A photographic investigation is described, using a Schlieren system and rotating-drum camera, of detonation waves in hydrogen-oxygen mixtures propagating in a 1.6 cm diameter tube of circular section. It is found that mixtures near the limits of detonability exhibit the phenomenon of spin in which the motion is of long wavelength and the frequency is in agreement with values predicted by existing theories. In stronger detonating mixtures a high-frequency spin of short wavelength is present which shows the same characteristics on a streak photograph as a normal long wavelength spin; measured values of frequency and wavelength agree reasonably well with those calculated. In a range of mixtures of intermediate composition both types of vibration are present. Longitudinal pressure waves, the recurrence frequency of which is twice that of the fundamental mode transverse vibration, are also observed behind the detonation front in all mixtures; the existence of these waves is confirmed by pressure recordings and a possible explanation of their origin is discussed.
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