Patent ID: 6530228
Filing Date: 2003-03-11
Classification: F02C,F05D,F23K,F23M,F23N,F23R,Y02T

Abstract:
An apparatus for modulation of a flame by injecting pulsed fuel at one or more sub-harmonic frequencies of an instability frequency of an air breathing combustor having instabilities, wherein the instabilities cause natural oscillations in fluid flow, comprising:at least one closed loop actuator, wherein said at least one closed loop actuator periodically injects the pulsed fuel into said combustor at the one or more sub-harmonic frequencies of said instability frequency; a sensor operatively coupled to said combustor down stream from an inlet to said combustor, wherein said sensor detects pressure oscillations in said combustor; and a first means for controlling operatively coupled to said at least one closed loop actuator and responsive to said sensor and including a divider, wherein said first means for controlling prompts said at least one closed loop actuator to periodically inject the pulsed fuel at the one or more sub-harmonic frequencies of the instability frequency and wherein the pulsed fuel modulates the natural oscillations within said combustor to produce tailored conditions within said combustor.