Fuel supply system with turbine driven start pump

Details Fuel supply system with turbine driven start pump Fuel supply system with turbine driven start pump

1987-12-24

1989-09-12

Caseregola, Louis J.

Power plants

Combustion products used as motive fluid

Different fluids

60734, 417245, F02C 726

Patent

active

048648159

ABSTRACT:
The use of a single main centrifugal fuel pump for supplying fuel to an aircraft gas turbine engine has advantages over other known systems, however a problem has existed in that the centrifugal pump, when driven in a fixed ratio to the engine speed, cannot deliver fuel at adequate pressure under engine starting conditions. The disclosed fuel supply system using a main centrifugal pump overcomes this shortcoming by having a turbine-driven start pump added to the fuel supply with both the turbine and the start pump receiving fuel pumped by the main centrifugal pump and the turbine utiliziing the high flow, low pressure fuel to drive the start pump which incresases the pressure of the fuel to a value adequate for engine starting. The start pump delivers fuel until such time as the main centrifugal fuel pump has reached a speed to provide the fuel to the engine at the required pressure, at which time the turbine is no longer driven and the output of the start pump goes to zero.

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