Abstract
The low-frequency combustion, oscillation occurring in the combustion system comprising a combustion duct, inlet and outlet orifices and a capacity chamber was analyzed as a dynamic instability of "closed loop". From the analysis of experimental facts it was concluded that the exhaust temperature fluctuation as the result of distortion and necking of flame would be the chief feedback mechanism, and such distortion is caused by velocity fluctuation. This view was confirmed by a forced oscillation experiment applying a fluctuating velocity on a flame and fuel jet. Theoretical analysis was made of a jet placed in fluctuating velocity field. The theory predicts the necking and distortion of jet. The theoretical result was easily interpreted as the relation of exhaust temperature to velocity fluctuation. The dynamics of combustion thus obtained was used together with the dynamics of fluid flow to discuss the nature of self-exciting oscillation.
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