Variable thrust nozzle for quiet turbofan engine and method of o

Details Variable thrust nozzle for quiet turbofan engine and method of o Variable thrust nozzle for quiet turbofan engine and method of o

1975-05-29

1978-01-17

Croyle, Carlton R.

Power plants

Reaction motor

Method of operation

60226R, 60271, F02K 306

Patent

active

040684695

ABSTRACT:
An improved method of operating a gas turbine engine is presented wherein engine-generated noise is maintained at a reduced level during reduced thrust operation. Fan speed is maintained at a constant level while fan nozzle area is increased. This maintains high inlet Mach numbers for reduced forward noise propagation and also permits reduced nozzle exhaust velocity for reduced shear noise. In another embodiment, airflow is increased by means of a fan blade pitch change or speed increase while the fan nozzle area is increased, yielding both a net reduction in engine thrust and noise.

REFERENCES:
patent: 2934966 (1960-05-01), Wood
patent: 3060680 (1962-10-01), Wilde et al.
patent: 3261164 (1966-07-01), Tumicki
patent: 3401524 (1968-09-01), Urban
patent: 3484847 (1969-12-01), Poole
patent: 3514952 (1970-06-01), Schumacher et al.
patent: 3747341 (1973-07-01), Davis
patent: 3913626 (1975-10-01), McMurtry

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