Patent ID: 6959550

Claim:
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 transversely to the direction of flow through the at least one fuel and air mixing duct, each air injector comprising a slot extending 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 volume of the fuel and air mixing duct being arranged such that the average travel time from the fuel injection means to the downstream end of the fuel and air mixing duct is greater than the time period of the fluctuation wherein the combustion chamber is a tubular combustion chamber, the tubular combustion chamber having a length and the slots in the fuel and air mixing duct having a length in the direction of flow through the at least one fuel and air mixing duct, the length of the slots in the direction of flow through the at least one fuel and air mixing duct being greater than four times the length of the tubular combustion chamber multiplied by the velocity of the fuel and air in the at least one fuel and air mixing duct divided by the average speed of sound inside the tubular combustion chamber.