Centrifugal fuel pump with automatically switched jet injection

Details Centrifugal fuel pump with automatically switched jet injection Centrifugal fuel pump with automatically switched jet injection

1979-12-20

1982-12-07

Croyle, Carlton R.

Pumps

One fluid pumped by contact or entrainment with another

Jet pump with motive fluid generating pump

60 3928R, 417 89, F04B 2314

Patent

active

043624740

ABSTRACT:
A centrifugal pump for pumping fuel to a gas turbine engine is equipped with a start injector and a run injector. The pump has a single fuel output nozzle from which fuel goes to the engine. It also has several other nozzles from which fuel goes to the start injector. The flow through the injector draws fuel from the engine fuel supply and raises the pressure on a pump inlet, thereby raising the pressure in the pump outlet nozzle. The run injector receives bypass fuel flow from the engine and uses it to draw in engine fuel which is supplied together with the bypass fuel to a pump inlet nozzle. The run injector increases the fuel pressure in that inlet. The start injector operates during starting and the run injector is inoperative at that time. When the engine speed reaches a minimum level for sustained engine operation, the start injector is inoperative and the run injector is operating.

REFERENCES:
patent: 3319569 (1967-05-01), Norris et al.
patent: 3532441 (1970-10-01), Schofield

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