Power plants – Reaction motor – Air passage bypasses combustion chamber
Patent
1978-09-19
1981-09-15
Garrett, Robert E.
Power plants
Reaction motor
Air passage bypasses combustion chamber
60226R, F02K 146, F02K 306
Patent
active
042889847
ABSTRACT:
Noise perceived below a turbofan is reduced by providing a thicker fan flow below the turbofan primary exhaust flow than is present in conventional turbofans having generally circular and concentric fan and exhaust flows. To thicken the fan flow, the exhaust nozzle is offset upward in the fan nozzle, or the exhaust nozzle discharge end is canted to offset the exhaust flow upward, or the exhaust nozzle is flattened to a generally rectangular or an elliptical shape having a major horizontal axis. In any of these cases, the thickness of the fan flow below the primary exhaust flow is increased and less noise is perceived below the turbofan than if circular concentric fan and exhaust flows were produced. In one embodiment a noise-suppressing thickened fan flow is used in combination with a conventional noise-suppressing multilobe or multitube mixing nozzle to further reduce noise perceived below the turbofan.
REFERENCES:
patent: 3137131 (1964-06-01), Tyler
patent: 3174282 (1965-03-01), Harrison
patent: 3174282 (1965-03-01), Harrison
patent: 3393518 (1968-07-01), Bridge
patent: 3495682 (1970-02-01), Treiber
patent: 3514955 (1970-06-01), Paulson et al.
patent: 3527317 (1970-09-01), Motsinger
patent: 3583640 (1971-06-01), MacDonald
patent: 3612212 (1971-10-01), MacDonald
patent: 3618701 (1971-11-01), MacDonald
patent: 3968853 (1976-07-01), Hoch et al.
patent: 4135363 (1979-01-01), Packman
McGraw-Hill Encyclopedia of Science & Technology, vol. 1, p. 207.
Bhat Waman V.
Wright Charles P.
Beach Robert W.
Brown Ward
Garrett Robert E.
The Boeing Company
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