| 摘要 |
Fuel injection nozzles used for reducing NOx in gas turbine engines has incorporated a variety of expensive and complicated techniques. For example, systems use schemes for introducing more air into the primary combustion zone, recirculating cooled exhaust products into the combustion zone and injecting water spray into the combustion zone. The present fuel injector (60, 166) reduces the formation of carbon monoxide, unburned hydrocarbons and nitrogen oxides within the combustion zone by controlling the premix air/fuel ratio and more explicitly by controlling the air portion of the air/fuel ratio over the entire operating range of the engine (10). The present fuel injector (60, 166) includes a main body assembly (133), a wrapper member (84) being generally coaxially positioned about the main body assembly (133) forming a device (101) for bleeding a portion of the combustion air therefrom, a housing (150) being generally coaxially positioned about the main body assembly (133) and a portion of the wrapper assembly (84) forming an inlet passage (155) between the housing (150) and the wrapper member (84) and an air/fuel premix passage (156) between the housing (150) and the main body assembly (133). The fuel injector (60, 166) reduces the flow of compressed air into the combustor (42) by providing the device (101) for bleeding a portion of the flow of compressed air exiting a compressor section (22) within the fuel injector (60, 166) and into a combustor (42). |
