Power plants – Combustion products used as motive fluid
Patent
1990-05-21
1992-07-14
Casaregola, Louis J.
Power plants
Combustion products used as motive fluid
60 39141, F02C 7262
Patent
active
051292211
ABSTRACT:
A relight fuel flow schedule controls fuel flow to the combustor of a turbofan aeroengine during in-flight relight procedures. A first fuel ramp, whose slope decreases with increasing altitude, enables the combustor to light with minimum fuel flow for the altitude and thus helps to prevent overfueling. The fuel flow rate undergoes a step reduction, after detection of satisfactory combustion, to prevent compressor stall, but cannot drop below a predetermined level to guard against flameout. The first fuel ramp is repeated if satisfactory combustion does not occur. After a successive relight a second fuel ramp is varied from flat to positive slope depending on the ratio of the rate of change of high pressure compressor speed to a datum level in order to prevent a hung start and accelerate the engine until normal acceleration control laws takes over.
REFERENCES:
patent: 4044551 (1977-08-01), Nelson et al.
patent: 4062186 (1977-12-01), Snow et al.
patent: 4218878 (1980-08-01), Kiscaden et al.
patent: 4245462 (1981-01-01), McCombs
patent: 4276743 (1981-07-01), LaGrone
patent: 4490791 (1984-12-01), Morrison
patent: 4597359 (1986-07-01), Moore et al.
Mansfield William G.
Robson Keith
Sellar Malcolm R.
Walker Joseph H.
Yates Donald A.
Casaregola Louis J.
Rolls-Royce plc
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