Abstract
In order to promote active and wide application of the pulse combustion systems for commercial and industrial use, experimental and numerical investigations on the acoustic resonance characteristics of a pulse combustor are made using the soap-bubble method. A soap bubble of propane-air mixture having a small diameter of 15mm is ignited in the open space and in the model pulse combustor and sound pressure and CH-emission intensity are then measured. A simplified numerical simulation on the acoustic properties in the pulse combustor is carried out, by assuming a quasi-one-dimensional, inviscid, and isentropic flow. The time history of pressure fluctuation calculated agrees very well to that measured experimentally in the initial stage of acoustic resonance in the pulse combustor. It is found that measurements of the acoustic pressure profiles in the model combustor having the same construction and dimensions as those of the real pulse combustor are necessary for predicting pressure amplitude characteristics in the pulse combustor. The assumption of inviscid flow, however, gives the limit of application to the long term description of the resonant behavior.
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