stability and reduce the chances of blowout application_number US 35830094 A description the present invention is a fuel injection design for a recuperated gas turbine engine which regulates the fuel and air mixing by controlling the degree of fuel and air mixing low but stable combustion temperatures are maintained over a wide flow range from starting conditions up to full power fuel and air mixing is controlled by the location of fuel injection jets in a long prechamber swirler to minimize no x emissions a lean fuel mixture is desired fig1 shows a schematic diagram showing a basic recuperated gas turbine system the present invention is believed to work best with recuperated systems but is also applicable to non recuperated gas turbine systems an air compressor 10 compresses inlet air 11 to a high pressure the compressed inlet air 12 passes through an external recuperator 40 or heat exchanger where exhaust gas 17 pre heats the compressed inlet air 12 the heated compressed inlet air is mixed with fuel 15 in a combustor 30 where the mixed fuel and air is ignited the high temperature exhaust gas 56 is supplied first to a compressor turbine 20 and then to a power turbine 21 the compressor turbine 20 drives the air compressor 10 power turbine 21 drives an electrical generator 22 typically a speed reduction gearing assembly not shown is used to connect the power turbine 21 to the electrical generator 22 other arrangements of these components may be used for example a single turbine can be used to drive both the.