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Title:
AIR CRAFT ROTOR BLADE HAVING SHAPE ADAPTED FOR IMPROVEMENTS ON ACOUSTIC ISSUE DURING FLYBY AND PERFORMANCES DURING HOVERING AND FORWARD FLIGHTS
Document Type and Number:
Japanese Patent JP2017141013
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an aircraft rotor blade having a shape adapted to make improvements on acoustic issue during flyby and performances during hovering and forward flights.SOLUTION: A blade provides a combination of relationships among changes in a sweep, a chord and a twist in a delimited airfoil profile so that, firstly, aerodynamic performance of the blade during both of forward flight and stationary flight can be enhanced, and secondary, noise generated during a flyby flight can be reduced. The blade has a double-tapered-shape providing three sweeps. The relationships on the twist are substantially constant across a first part of the blade, and reduced linearly or non-linearly in the rest of the parts. An appropriate change in a twist inclination of the blade allows the aerodynamic performances of the blade to be enhanced.SELECTED DRAWING: Figure 2

Inventors:
DEBBIE LEUSINK
DAVID ALFANO
VINCENT GARETON
Application Number:
JP2016238613A
Publication Date:
August 17, 2017
Filing Date:
December 08, 2016
Export Citation:
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Assignee:
AIRBUS HELICOPTERS
International Classes:
B64C11/18; B64C27/467
Domestic Patent References:
JPH11139397A1999-05-25
JPS61181798A1986-08-14
JPH11139397A1999-05-25
JPS61181798A1986-08-14
Foreign References:
US20150050137A12015-02-19
US20120251326A12012-10-04
US20090169381A12009-07-02
US6364615B12002-04-02
US5209643A1993-05-11
EP0592764A11994-04-20
US20150050137A12015-02-19
US20120251326A12012-10-04
US20090169381A12009-07-02
US6364615B12002-04-02
US5209643A1993-05-11
EP0592764A11994-04-20
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito



 
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