| 摘要 |
PCT No. PCT/GB94/02219 Sec. 371 Date May 9, 1995 Sec. 102(e) Date May 9, 1995 PCT Filed Oct. 12, 1994 PCT Pub. No. WO95/11408 PCT Pub. Date Apr. 27, 1995A fuel injector for a gas turbine conbustor, the injector operating on gas and liquid fuels selectively. The injector has a central liquid fuel duct and jets, an annular gas duct and gas jets, and an outer annular combustion air duct. Operation on the liquid fuel tends to cause combustion products to be ingested into the gas orifices so impeding efficient gas combustion. The invention provides 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 surrounding the ring of gas jets. More efficient gas combustion results.
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