Rotor system having alternating length rotor blades for reducing

Details Rotor system having alternating length rotor blades for reducing Rotor system having alternating length rotor blades for reducing

1995-12-11

1997-04-15

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Radially extensible or retractible rotor working member

416 89, 416203, 415119, B64C 1128

Patent

active

056203039

ABSTRACT:
A rotor system (4) having odd and even blade assemblies (O.sub.b, E.sub.b) mounting to and rotating with a rotor hub assembly (6) wherein the odd blade assemblies (O.sub.b) define a radial length R.sub.O, and the even blade assemblies (E.sub.b) define a radial length R.sub.E and wherein the radial length R.sub.E is between about 70% to about 95% of the radial length R.sub.O. Other embodiments of the invention are directed to a Variable Diameter Rotor system (4) which may be configured for operating in various operating modes for optimizing aerodynamic and acoustic performance. The Variable Diameter Rotor system (4) includes odd and even blade assemblies (O.sub.b, E.sub.b) having inboard and outboard blade sections (10, 12) wherein the outboard blade sections (12) telescopically mount to the inboard blade sections (10). The outboard blade sections (12) are positioned with respect to the inboard blade sections (10 such that the radial length R.sub.E of the even blade assemblies (E.sub.b) is equal to the radial length R.sub.O of the odd blade assemblies (O.sub.b) in a first operating mode, and such that the radial length R.sub.E is between about 70% to about 95% of the length R.sub.O in a second operating mode.

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J.C. Hardin, S.L. Lamkin, A1AA-86-1855. Concepts for Reduction of Blade-Vortex Interaction Noise, presented at A1AA 10th Aeroacoustics Conference Jul. 9-11, 1986/Seattle, Washington.
Thomas F. Brooks, Studies of Blade-Vortex Interaction Noise Reduction By Rotor Blade Modification, from Noise-Con 93, Williamsburg, Virginia, May 2-5, 1993.
Lyrintzis, A.S., Koutsavdis, E.K., Berezin, C.R., Visintainer, J.A. and Pollack, M.J., Kirchhoff Acoustic Methodology Validation and Implementation in the Tiltrotor Aeroacoustic Codes (TRAC), presented at the 2nd AHS Aeromechanics Specialists' Conference, Bridgeport, CT, Oct. 11-13, 1995.

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