Patent ID: 6601393
Filing Date: 2003-08-05
Classification: F02C,F05D,F23K,F23M,F23N,F23R,Y02T

Abstract:
A method of active control modulation of a flame in a combustor having an instability frequency by injecting pulsed fuel via a plurality of actuators having at least one closed loop actuator and at least one open loop actuator, comprising:feeding a fluid flow into said combustor through an inlet, wherein instabilities in said combustor produce natural oscillations in the fluid flow; generating a signal detecting the pressure oscillations within said combustor; engaging a closed loop control device operatively to said at least one closed loop actuator and responsive to a sensor, wherein said closed loop control device prompts the closed loop actuator to inject the pulsed fuel into a shear layer of said combustor; injecting the pulsed fuel from the closed loop actuator into said combustor, wherein the pulsed fuel from said closed loop actuator controls the amplitude of the pressure oscillations in said combustor by modulating the natural oscillations; engaging an open loop control device operatively coupled to said at least one open loop actuator, wherein said open loop control device prompts said at least one open loop actuator to inject pulsed fuel into said combustor at a driving frequency; and injecting pulsed fuel from said open loop actuator into said combustor at said driving frequency.