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Mechanically actuated slot for circulation control rotor
| Details |
Inventors: Amelio, Armand F.; Fischer, Jr., William C.;
Assignee: United Technologies Corporation (Hartford, CT)
Primary Examiner: Look; Edward K.
Assistant Examiner: Nguyen; Hoang
Attorney, Agent or Firm: Lipes, Jr.; Russel M.
A circulation control rotor system for aircraft in which compressed air is directly supplied at generally constant pressure to plenums in the rotor blades and discharged through area controlled slots, the area controlling means involving camming surfaces and being actuated by cyclic, collective, aircraft vibration and flight stability inputs. |
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DETAILED DESCRIPTION The valving device controlling air flow distribution to the rotor blades in a circulation control rotor is relatively complex and as a result impacts reliability.
In addition, it adds weight to the aircraft.
Further, two additional factors dominate the effectiveness of the device; first a smearing or averaging of the airflow to the rotor blades about the azimuth of the device, and, second, a transport lag of the airflow between the valving actuators and the spanwise slot control surfaces.
With respect to the smearing or averaging factor, a receiver duct in the distribution arrangement is in fluid communication with as many as three valving device supply ducts, one full and two partial, at any one increment of time.
The optimum airflow control is in the form of a sinusoidal wave, but smearing or averaging results in a wave form only approximating that of a sine wave.
As a result, fidelity of replicating a desired waveform is compromised.
With respect to transport lag, the control response of the aircraft is a function of the cyclic and collective lift vector components active on the rotor disc.
Inasmuch as these force control vectors are generated by the circulation control slots along the leading and trailing edges of the rotor blade, optimum control may be achieved by instantaneously supplying the desired airflow to the slots.
Since air is a compressible fluid and the distribution ducts introduce significant head loss, a transport lag of the air to the slots results, thus degrading control response of the system.
It is an object of this invention, therefore, to provide a circulation control rotor air distribution/control system having improved waveshape fidelity and enhanced control response.
Another object of the invention is the elimination of the valving device in the typical circulation control air bleed control mechanism and the provision of a system, mechanical, hydraulic, or electrical, which instantaneously supplies desired airflow to the circulation control slots in the rotor blades
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