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UnitedStatesPatent  Bretz et al.
[1 PatentNumber: 5,224,333  DateofPatent: Jul.6,1993
 SIMPLEX AIRBLAST FUEL INJECTION  ABSTRACT
 Inventors: DavidH.Bretz,Bloom?eld Township, Davis County; Darrell G.
Bobzin, West Des Moines, both of Iowa
[731 Assignee: DelavanInc,WestDesMoines,Iowa [21 Appl.No.: 825,345
A simplexairblastfuelinjection-systemfortheatomiza tion of fuel for ignition to drive a gas turbine includes a simplex nozzle which receives fuel from a fuel pump powered by the turbine over a range of pressures be tween maximum and minimum pressures during the operation of the turbine, and also receives fuel at a substantially lower pressure than the minimum fuel pressure when the turbine is cranked during startup. The fuel isdischarged from the nozzle orifice as a swirl ing stream of atomized fuel during turbine operation, and as a film which is insufficiently atomized to initiate ignitionduringtheturbinestartup.An aircompressoris also powered by the turbine to supply air at a low pres
sure to the fuel issuing from the nozzle ori?ce during both turbine operation and startup. An air director shroud imparts a swirling motion to the low pressure air and directs the swirling air to adjacent the fuel film as it issues from the nozzle orifice during startup to produce apressuredifferentialbetween oppositesidesofthe?lm toexplodeandatomizethefuel?lmsuf?cienilytoper
Related US. Application Data  DivisionofSer.No.492,774,Mar.13,1990.
Int.Cl.5..F02C7/26;FOZG3/00  US. Cl. ..............................Gil/39.06; 60/740  Field of Search .. 60/3906, 39.141, 39.142,
60/737, 738, 740, 748 References Cited
3.668.869 6/1972 De Corso etall ...................60/740
3,853.27312/1974B3111’etal._..... .......60/748 mitignitionduringturbinestartup.Astreamoflow
3.886.736 7/l975 Kawaguchi ....... 60/748 4,891,935 1/1990 McLaurin et a1. . .....,. 60/740 4,938,019 7/1990 Angeli et a1. ..................... 60/3906
Primary Examiner—-Richard A. Bertsch AssistantExaminer-I-loward R. Richman Attorney,Agent,orFirm-Howard S.Reiter
pressure air is also directed to the swirling stream of atomized fuel during turbine operation and that air stream is also preferably swirling.
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