Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – Responsive to moving member developed fluid force – current...
Patent
1983-05-19
1984-12-11
Garrett, Robert E.
Rotary kinetic fluid motors or pumps
With control means responsive to non-cyclic condition...
Responsive to moving member developed fluid force, current...
415 26, 415144, F01D 1900
Patent
active
044875487
ABSTRACT:
A centrifugal main fuel pump (10') for a gas turbine engine has a housing (12') in which a centrifugal impeller (16') is mounted for rotation. The centrifugal impeller includes a disc (24') which carries starting flow impeller elements (34) which are positioned in a radially outer location on the disc and also carries main flow impeller elements (26') positioned in a radially inner location on the disc. The starting flow impeller elements discharge to a starting flow collector (38) and diffuser (44) and the main flow impeller elements discharge to a separate collector (30') and diffuser (32'). The starting flow impeller elements produce adequate fuel flow at the pressure necessary for engine lightoff while the main flow impeller elements are adapted to supply engine fuel flow demand in the normal range of operation. A check valve (46) prevents starting flow from returning to the centrifugal impeller. The check valve opens to allow the main flow impeller elements to supply fuel when their discharge pressure exceeds that of the starting flow impeller elements. The addition of a starting element to the impeller results in minimal additional parasitic power loss.
REFERENCES:
patent: 2658338 (1953-11-01), Leduc
patent: 3576375 (1971-04-01), Jackson
patent: 3851998 (1974-12-01), Downing
patent: 3953147 (1976-04-01), Aspinwall
patent: 4194893 (1980-03-01), Woodhouse et al.
Leachman, Jr. Frank A.
Noell Godwin L.
Chandler Evans Inc.
Dornon Richard A.
Garrett Robert E.
Luther Radford W.
Nauman Timothy E.
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