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High lift and low torque characteristic 12%-thickness rotor-wing airfoil suitable for all working conditions

A full-condition, rotor-wing technology, applied to rotorcraft, aircraft, motor vehicles, etc., can solve the problems that cannot meet the design requirements of high-performance rotors of helicopters, and the lift-to-drag ratio and maximum lift coefficient need to be improved.

Inactive Publication Date: 2017-05-31
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The 12% thick rotor airfoil OA312 disclosed abroad has the same thickness as the present invention, but other shape parameters are different from the present invention, and the lift-to-drag ratio and the maximum lift coefficient still need to be improved, which cannot be adapted to the high-performance rotor design of helicopters. need

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  • High lift and low torque characteristic 12%-thickness rotor-wing airfoil suitable for all working conditions
  • High lift and low torque characteristic 12%-thickness rotor-wing airfoil suitable for all working conditions
  • High lift and low torque characteristic 12%-thickness rotor-wing airfoil suitable for all working conditions

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Embodiment Construction

[0035] Embodiments of the present invention are described in detail below, and the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0036] With the development of new high-performance helicopters, more stringent requirements are put forward for the design of high-performance helicopter rotor airfoils, which require high lift-to-drag ratio, high maximum lift coefficient, and low moment characteristics under multiple working conditions.

[0037] Based on the above purpose, the present embodiment designs a 12% thick airfoil with high lift-to-drag ratio, high maximum lift coefficient and lower zero-lift drag coefficient. The full working conditions mentioned in this article refer to all the working conditions of the helicopter rotor airfoil in actual use. For the airfoil proposed by the present invention, it refers to the working conditions where the Mach number ranges from 0.3 to 0.6.

[003...

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Abstract

The invention provides a high lift and low torque characteristic 12%-thickness rotor-wing airfoil suitable for all working conditions, The 12%-thickness rotor-wing airfoil is characterized in that the radius of a front edge is reduced, so that shock-wave strength is reduced, the resistance is further reduced, and a lift-drag ratio is increased; the thickness of the lower part of the airfoil is increased to some extent, so that the torque is reduced. Compared with a high lift drag ratio and high resistance divergence Mach number 12%-relative-thickness rotor-wing airfoil OA312 disclosed abroad at present, the rotor-wing airfoil provided by the invention completely meets design indexes under multiple working conditions, and has a high lift drag ratio, a high resistance divergence Mach number, a high maximum lift coefficient and a smaller torque coefficient; when Ma is equal to 0.77, the zero lift drag is lower, so that the performance requirements of a high performance helicopter rotor blade design can be met.

Description

technical field [0001] The invention relates to the technical field of rotor airfoil design, in particular to a 12% thick rotor airfoil applied to a high-performance helicopter rotor under all working conditions with high lift-to-drag ratio, high maximum lift coefficient, and low zero-lift drag coefficient. Background technique [0002] The close relationship between helicopter performance and advanced rotor airfoil design is mainly reflected in the following two aspects: (1) The improvement of rotor airfoil performance can promote the development of high-performance helicopters. Under changing conditions, the resistance divergence Mach number increases by 0.05 to 0.12, or the maximum relative thickness of the airfoil increases by 2% to 5%. Therefore, the low resistance and high resistance divergence Mach number characteristics of the French OA5 rotor airfoil series make the helicopter The forward flight speed and maneuverability have been significantly improved. (2) Due to...

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Application Information

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IPC IPC(8): B64C27/467
CPCB64C27/467
Inventor 杨旭东彭小康高正红黄明左英桃焦予秦宋文萍
Owner NORTHWESTERN POLYTECHNICAL UNIV
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