Periodic equivalence ratio modulation method and apparatus for controlling combustion instability

摘要: The periodic equivalence ratio modulation (PERM) method and apparatus significantly reduces and/or eliminates unstable conditions within a combustion chamber. involves modulating the for device, such that device periodically operates outside of an identified oscillation region. is modulated between preselected reference points, according to shape region operating parameters system. Preferably, from first stable condition second condition, and, alternatively, condition. further applicable multi-nozzle combustor designs, whereby individual nozzles are alternately conditions. Periodic accomplished by active control involving periodic, low frequency fuel modulation, pulses injected into main delivery. Importantly, at rate so as not affect desired time-average device.