Airflow control system for a helicopter

Details Airflow control system for a helicopter Airflow control system for a helicopter

1995-03-08

1997-10-14

Kashnikow, Andres

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 52, B64C 2782, B64B 136

Patent

active

056763352

ABSTRACT:
A system is disclosed for controlling the external flow passing along the external surface of an aircraft such as the tailboom of a helicopter. A fan blows air into a cavity within a surface, and the air exits the surface through one or more axially oriented slots. A ramp structure is positioned within the cavity and upstream of each slot, and a set of fence structures are mounted in each slot and spaced from each other as well as from the ramp structure. The ramp and fence structures trip the airflow which then couples to the downstream side of the ramp and fence structures, thus eliminating the axial airflow component adjacent to the slot, and exits the slot in a direction normal to the axis. The airflow exits the slot in a direction tangential to the external surface and generally parallel with the external flow, resulting in deflection of the external flow and generating lift which is used to augment antitorque control in the helicopter implementation described.

REFERENCES:
patent: 4200252 (1980-04-01), Logan et al.
patent: 4948068 (1990-08-01), Van Horn
patent: 5205512 (1993-04-01), Rumberger
patent: 5232183 (1993-08-01), Rumberger

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