Patent ID: 6698206
Filing Date: 2004-03-02
Classification: F23C,F23D,F23R

Abstract:
A combustion chamber comprising at least one combustion zone defined by at least one peripheral wall, at least one fuel and air mixing duct for supplying a fuel and air mixture to the at least one combustion zone, the at least one fuel and air mixing duct having an upstream end and a downstream end, fuel injection means for supplying fuel into the at least one fuel and air mixing duct, air injection means for supplying air into the at least one fuel and air mixing duct, the pressure of the air supplied to the at least one fuel and air mixing duct fluctuating, the air injection means comprising a plurality of air injectors spaced apart in the direction of flow through the at least one fuel and air mixing duct to reduce the magnitude of the fluctuations in the fuel to air ratio of the fuel and air mixture supplied into the at least one combustion zone, the fuel and air mixing duct having a volume and a length, the injectors being spaced apart to Progressively introduce air into the fuel and air mixing ducts along the length of the fuel and air mixing duct to integrate out the fluctuations in the fuel to air ratio, the volume of the fuel and air mixing duct being selected so that the average travel time from the fuel injecting means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation, the volume of the fuel and air mixing duct being such that the length thereof is at least two multiplied by the velocity of the fuel and air mixture leaving the downstream end of the fuel and air mixing duct divided by the frequency of the fluctuations and wherein the at least one fuel and air mixing duct comprises a single annular fuel and air mixing duct, the air injection means being axially spaced apart.