Abstract
Power combustion systems have the potential for thermoacoustic instabilities, with many possible detrimental results. The present study experimentally investigates effects of the distribution of various heat sources on a Rijke tube. An electrical heater was designed to realize different tangential distributions of heat release by changing the spacing of the heating element. The experimental results showed that an optimum spacing exists to minimize the starting power of thermoacoustic oscillation and growth rate, and to maximize FFT amplitude. The oscillation frequency changed slightly with a different tangential distribution of heat release for different air flows. Numerical simulation was performed using the CFD method to obtain temperature and flow field distribution of the Rijke tube with different spacing of the heating element. The numerical results showed that a large high temperature and high speed region, forming immediately and simultaneously behind the heater, are conducive to thermoacoustic oscillation.
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