Turbofan gas turbine engine

Details Turbofan gas turbine engine Turbofan gas turbine engine

1989-09-08

1990-06-19

Stout, Donald E.

Power plants

Reaction motor

Interrelated reaction motors

137 151, 244 53B, F02K 304

Patent

active

049341391

ABSTRACT:
The present invention relates to turbofan gas turbine engines. In conventional high bypass ratio turbofans the large variations in the free air stream flowing into the fan duct inlet is accommodated by a thick lip and a long, thick fan casing to prevent air flow separation from the outer surface of the fan casing, but produces a heavy fan casing and large drag values. In the invention a turbofan comprises a core engine which has a core casing, and a fan assembly positioned downstream of the core engine. The fans operate in a fan duct defined by the fan casing. The core casing has an external form upstream of the fan duct inlet which affects the airflow streamlines flowing into the fan duct inlet to cause it to adopt a flow path which is near alignment with the length of the fan casing to reduce fan casing weight, length and drag.

REFERENCES:
patent: 3348379 (1967-10-01), Wilde et al.
patent: 3363419 (1968-01-01), Wilde
patent: 3618323 (1971-11-01), Needham
patent: 4389227 (1983-06-01), Hobbs
patent: 4767270 (1988-08-01), Seidel

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