Power plants – Combustion products used as motive fluid – Multiple fluid-operated motors
Patent
1988-12-12
1991-03-12
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
Multiple fluid-operated motors
60 39281, F02C 928
Patent
active
049989499
ABSTRACT:
A fuel control system for a three spool gas turbine aeroengine has a fuel contorl unit incorporating an intermediate pressure spool overspeed limiter. A fuel control signal is produced which drives a fuel metering unit to meter the flow of fuel to the engine in accordance with control and sensor inputs as acted upon by predetermined control laws incorporated in the fuel control unit. The engine has variable inlet guide vanes (VIGV's) in one or more of its compressor stages and a safety problem arises in that if the VIGV's fail at an angle for low engine speed while the engine is accelerating to a high speed, the rotational speed of the intermediate pressure spool can increase very quickly. This can lead to overshooting of maximum acceptable levels of spool speed before known overspeed limiters have time to regain control.
The problem is solved by incorporating an overspeed limiter function for the intermediate pressure spool whose speed limit setting is not just an upper limit as previously, but which varies between lower and upper limits as a function of at least one other internal working parameter of the engine such as the speed of the high pressure spool. The arrangement is such that whenever actual spool speed exceeds the variable limit, a signal is generated which is proportional to the difference between actual spool speed and the variable limit and which is used to reduce the fuel flow to the engine.
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Casaregola Louis J.
Rolls-Royce plc
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