Abstract
Low frequency oscillation encountered in combustion system involving entrance resistance, exit resistance and capacity, was studied experimentally as well as theoretically and its nature was clarified. Various factors influencing on the frequency and the amplitude of oscillation, for example, entrance and exit resistance, capacity, shape of burner and its position, were examined experimentally and from these results the author concludes that this oscillation is nothing other than velocity feedback self exciting oscillation. And then, a photografical investigation has shown that the principal mechanism of the oscillation lies in the interaction of turbulence generation and heat generation. In theoretical investigation, hypothesis was raised on the detailed mechanism of the above interaction ; the hypothesis was combined with the equation of unsteady aerothermo-chemistry, so as to yield "velocity transfer function of combustion tube". This transfer function was used to examine the possibility of generation of self exciting oscillation in the system. The theory compares qualitatively well with experimental results.
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