| 摘要 |
<p>A fuel injector for a gas turbine combustor, the injector operating on gas and liquid fuels selectively. The injector has a central liquid fuel duct (23) and orifices (25), an annular gas duct (1) and gas orifices (3), and an outer annular combustion air duct (13). Operation on the liquid fuel tends to cause combustion products to be ingested into the gas orifices so impending efficient gas combustion. There are provided apertures (17) between the outer air duct and the intermediate gas duct whereby during operation on liquid fuel air bleeds into the gas duct and purges the gas orifices. As an added advantage, in a transition from liquid fuel to gas, the gas pressure is increased to a point where the air bleed is reversed and gas bleeds into the air duct. The pre-mixed gas/air is then emitted from swirlers (15) surrounding the ring of gas orifices. More efficient gas combustion results.</p> |
