Patent ID: 8857189
Filing Date: 2014-10-14
Classification: F23R

Abstract:
1. A gas-turbine combustion burner which is provided, at a distal end thereof, with a fuel injector that sprays fuel through an outlet thereof into a combustion region formed inside a combustion cylinder of a gas-turbine combustor; wherein a fuel flow path that guides the fuel, which is supplied from a fuel source, to the fuel injector is formed in the interior of the burner, wherein the fuel injector comprises a tube-shaped portion which protects from an outer circumferential edge of the distal end of the burner, wherein the tube-shaped portion comprises an internal fuel passage extending from an inlet to the outlet of the fuel injector, the internal fuel passage in fluid communication with the fuel flow path, wherein a baffle plate having a constant-diameter opening is provided at an intermediate position in the fuel flow path, wherein a value of an acoustic resistance for a flow velocity of fuel flowing through the fuel flow path is determined from a normal-incidence sound absorption coefficient, which indicates the ratio of a pressure wave absorbed between the baffle plate and the outlet with respect to the pressure wave propagated from the combustion region upstream of the baffle plate, and wherein the diameter of the opening is set so that the acoustic resistance for the flow velocity of fuel flowing through the fuel flow path is larger than an acoustic resistance at which the normal-incidence sound absorption coefficient is at a desired value.