GB608031A - Improvements in or relating to liquid fuel nozzles for gas turbines and like power plants - Google Patents

Abstract

608,031. Liquid-fuel burners. BENDIX AVIATION CORPORATION. Sept. 21, 1945, No. 9497/48. Convention date, Oct. 9, 1944. Divided out of 604,466. [Class 75(i)] A fuel nozzle assembly for a gas turbine or like power plant comprises a nozzle body having a chamber therein terminating in a discharge orifice defining a seat, a nozzle element mounted to slide in said chamber and having a tip adapted to engage in said seat, means resiliently urging said element to seated position, said tip being formed with a plurality of fine-passages which constitute the sole outlet means through which fuel is discharged until the pressure of the fuel in the chamber attains a value such as to move said element from its seat, and means for conducting fuel to said chamber. Fuel is supplied to the nozzle body 67, Fig. 1, through a conduit 79 and at low pressures is discharged through the orifice 69 by way of spiral grooves on the periphery of an 'annulus 74 and on the tapered end 73 of a valve member 70, respectively. The end 73 seats against the orifice 69 under the action of spring 71 which is adjustable in compression by a nut 72. As the pressure of the fuel is increased the member 70 is moved back against the spring 71 so that the flow of fuel is no longer restricted by passage through the grooves in the end 73 and the spray leaves the orifice 69 -at a lower cone angle. In an alternative construction, shown in Fig. 4, the fuel is supplied to the nozzle chamber 88 through a conduit 79 and ports 89, and at low pressure flows through bores 90, Fig. 5, formed in the spray head 82 tangentially to a central cavity 91. From the latter recess the fuel is discharged through an orifice 93. The spray head 82 is normally held seated against an orifice 84 in the end of the body 81 by a spring 83, which is adjustable in compression by nuts 94, 95. As the fuel pressure rises the spray head 82 becomes unseated and the fuel is discharged mainly through the orifice 84 at a spraying angle determined by the angle of the coneshaped head 82.