The current practice of firing lean premixtures of natural gas in gas turbines has led to a need for greater understanding of the problem of combustion-induced vibrations. This is due to the susceptibility of such systems (which are operated in the lean mode to suppress NO_x formation) to thermo-acoustic interactions, and the possibility that major structural damage will result. The susceptibility arises from the acoustic characteristis of the premixture supply system and the combustion chamber, and from the sensitivity of the flame to the velocity fluctuations associated with acoustic waves.
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