Abstract
Abstract Measurements of imtantaneous velocity, instantaneous temperature, and the corresponding mean and r.m.s. values, were made in a number of diffusion flames. The velocity measurements were obtained with a laser anemometer and the temperature measurements with a thermocouple, in various flames of methane, town gas and hydrogen. All the flames exhibited osoillations with frequencies around 11 Hz. The instantaneous velocity and temperature signals were nearly sinusoidal, except near the reaction zone where double frequencies and spiky signals were observed. A model which represents the many observed features of the oscillating flames is suggested. It appears that the oscillations stem from aerodynamic instabilities associated with points of inflection in the local instantaneous velocity distributions.
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