Power plants – Combustion products used as motive fluid – With variable oxidizer control
Patent
1979-09-28
1981-04-28
Garrett, Robert E.
Power plants
Combustion products used as motive fluid
With variable oxidizer control
60737, 60748, 60746, 60743, F02C 722
Patent
active
042637805
ABSTRACT:
A combustion apparatus for gas turbine engines particularly adapted to reduce emissions to meet automotive requirements. The fuel is laid on the wall of a cylindrical prechamber and evaporated from the wall by combustion air which is introduced through a swirler at the upstream end of the prechamber. The inner surface of the prechamber is artificially roughened by a grid of grooves to improve fuel evaporation. The fuel is laid on the wall from an annular manifold extending around the upstream end of the prechamber through tangential orifices leading from the manifold into the interior of the prechamber. More air enters through entrance ports distributed around the prechamber toward its downstream end. The resulting lean fuel-air mixture is delivered past an annular flow dam at the outlet of the prechamber into a domed combustor wall forming a combustion or reaction zone which is abruptly enlarged from the prechamber. Still other air bypasses the prechamber and is directed through ports formed in the dome of the combustor wall where swirlers direct the bypassed air into prevaporized fuel and air from the prechamber. The structure reduces pressure drop across the flow dam while enhancing turbulent flow, recirculation, and good mixing in the reaction zone. A dilution zone downstream of the reaction has a circumferential array of dilution air ports which are of such shape as to be varied nonlinearly in area by a sliding ring valve. The sliding ring valve is coupled to a second sliding ring valve which varies the area of the air entrance ports in the prechamber in reverse sense to the dilution air ports.
REFERENCES:
patent: 3859787 (1975-01-01), Anderson et al.
patent: 3930368 (1976-01-01), Anderson et al.
patent: 3930369 (1976-01-01), Verdouw
patent: 4141213 (1979-02-01), Ross
patent: 4155220 (1979-05-01), Emory
Evans J. C.
Garrett Robert E.
General Motors Corporation
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