High-efficiency high-altitude propeller with extremely low Reynolds number and high-altitude unmanned aircraft

A propeller and Reynolds number technology, applied in propellers, aircraft parts, transportation and packaging, etc., can solve problems such as the inability to apply high-altitude drones, avoid serious deterioration of aerodynamic performance, improve propeller efficiency, and improve profile Reynolds number. Effect

Active Publication Date: 2014-11-19
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] The propellers disclosed in the prior art are usually aimed at a Reynolds number greater than 10 5 It is...

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  • High-efficiency high-altitude propeller with extremely low Reynolds number and high-altitude unmanned aircraft
  • High-efficiency high-altitude propeller with extremely low Reynolds number and high-altitude unmanned aircraft
  • High-efficiency high-altitude propeller with extremely low Reynolds number and high-altitude unmanned aircraft

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Embodiment Construction

[0039] The present invention is described in detail below in conjunction with accompanying drawing:

[0040] The invention provides a fixed-pitch variable-speed two-blade propeller suitable for an environment with a working height of 25-30 kilometers, an extremely low Reynolds number (10,000-100,000), a rated power of 6-10 kw, and a speed of 600-1,000 rpm. up to 80%, as in figure 1 and figure 2 As shown, they are the side view and top view of the propeller respectively. The diameter of the propeller is 4-5 meters, and the maximum chord length is 400-600mm, including the first blade and the second blade; the first blade and the second blade are relative to The propellers are arranged axially symmetrically, that is to say, the geometric shape and structural parameters of the first blade and the second blade are completely the same. Both the first paddle and the second paddle have a geometric feature of sweep in the range of 80%R-90%R, and the sweep range is 0-0.05R. In addit...

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Abstract

The invention provides a high-efficiency high-altitude propeller with an extremely low Reynolds number and a high-altitude unmanned aircraft. The propeller is a two-paddle propeller, and comprises a first paddle and a second paddle, wherein the first paddle and the second paddle are arranged symmetrically to a shaft of the propeller; the propeller has the diameter of 4-5 m and the maximum chord length of 400-600 mm; through a wing section of the high-lift and low-Reynolds number propeller, the paddles with wider inner sides and featured with paddle tip sweepback are designed out, and both the first paddle and the second paddle have sweepback geometrical features within the range of 80-90% R, have the sweepback ranges of 0-0.05 R, and have the maximum chord widths within the range of 35-45% R; the propeller works in a flow state of the extremely low Reynolds number of 10,000-100,000, and in a long-time cruise state at a 25-30 km altitude, the propeller has the absorbed power of 6-10 kilowatts; the propeller has the efficiency greater than 80%, which can reduce energy demand of a propulsion system of the high-altitude unmanned aircraft.

Description

technical field [0001] The invention belongs to the technical field of aerodynamics, and in particular relates to an extremely low Reynolds number high-efficiency high-altitude propeller and a high-altitude unmanned aerial vehicle. Background technique [0002] The U.S. "Helios" UAV uses solar-powered propellers as power, and has reached a height of 29,400 meters in test flights. For such high-altitude drones, there are special low Reynolds number problems in both the wings and the propellers. When the Reynolds number is in the order of 10,000 to 100,000, the laminar boundary layer on the surface of the airfoil is easy to separate, which seriously deteriorates the aerodynamic performance and shows strong nonlinear characteristics. [0003] The propellers disclosed in the prior art are usually aimed at a Reynolds number greater than 10 5 Due to the design, it cannot be applied to high-altitude UAVs with extremely low Reynolds numbers of 10,000 to 100,000. Contents of the ...

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Application Information

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IPC IPC(8): B64C11/18
Inventor 许建华杨旭东张顺磊宋文萍朱敏宋超宋笔锋安伟刚王海峰李育斌张玉刚
Owner NORTHWESTERN POLYTECHNICAL UNIV
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