Patent ID: 7603862

Claim:
A combustion device for an engine comprising: a duct for conveying a gas flow established in operation; primary fuel delivery means for delivering fuel to the duct; secondary fuel delivery means for delivering fuel to the duct; a combustion region disposed downstream of the primary fuel delivery means and the secondary fuel delivery means; and control means comprising: a pressure transducer responsive to fluctuating pressure in the duct, and a valve arranged to divert fuel from the primary fuel delivery means in response to the fluctuating pressure in the duct, wherein the control means controls the valve for reducing the flow of fuel to the primary fuel delivery means in synchronism with peaks in the fluctuating pressure in the duct by diverting the fuel from the primary fuel delivery means to the secondary fuel delivery means, wherein the secondary fuel delivery means discharges the fuel into the duct and is disposed at an axial distance upstream of the primary fuel delivery means with respect to a direction of the gas flow, the axial distance selected such that the fuel discharged from the secondary fuel delivery means is capable of reaching the combustion region at troughs in the fluctuating pressure in the duct.