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A Design Method of Adaptive Aerodynamic Variable-pitch Propeller

A variable-pitch propeller and design method technology, applied in the field of aviation aircraft, can solve problems such as poor stall characteristics at high angles of attack, low trim lift coefficient, and inability to use high propeller disk loads, etc., to achieve efficient use

Active Publication Date: 2021-11-09
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inherent defects of the reverse-curved airfoil are that its trim lift coefficient is too low, and the stall characteristics at high angles of attack are poor. The designed propeller absorbs low power, which makes it unable to be used in the state of high propeller disk load, so it is not suitable for vertical airfoils. Scenarios that require high paddle loads such as taking off and landing aircraft

Method used

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  • A Design Method of Adaptive Aerodynamic Variable-pitch Propeller
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Embodiment Construction

[0047] 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.

[0048] The design method proposed by the present invention can design the propeller blade as an aerodynamic variable-pitch propeller blade with static stability capability. The meaning of static stability is that when the ratio of the blade incoming flow velocity (perpendicular to the propeller disc) to the propeller rotational speed increases (the angle of attack of the blade profile decreases), the blade automatically increases the twist angle (pitch angle); when the propeller The ratio of the blade incoming flow velocity to the speed linear velocity decreases (the angle of attack of the blade profile increases), and the blade automatically reduces the twist angle (pitch angle).

[0049] The specific design method is:

[0050] (1) According to the high prop...

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Abstract

The present invention proposes an adaptive aerodynamic variable pitch propeller design method, utilizes the concept and method of longitudinal trimming of aviation aircraft, and designs the aerodynamic characteristics of the propeller blade itself without redundant additional mechanisms. Based on the principle of trimming the layout, the blades are designed as a dual-blade layout with aerodynamic and static stability. While having the ability to provide high paddle disk loads, it can handle changes in the forward ratio caused by changes in flight speed or rotational speed. Automatic pitch change, so that the propeller has better automatic pitch change characteristics in a wider flight envelope.

Description

technical field [0001] The invention relates to the technical field of aviation aircraft, in particular to an adaptive aerodynamic variable-pitch propeller design method for a small aircraft power system. Background technique [0002] Aiming at the design contradiction of the propeller in different flight states of the aircraft, a controllable pitch variable device can usually be used for large aircraft. However, for small aircraft or UAVs, the mechanism of the controllable propeller pitch variable system is too complicated, and the weight cost is relatively high. In order to find a cheaper design scheme for propeller wide envelope, some related researches have proposed some solutions. For example, Liu Chengye, Song Bifeng and others have studied a variable diameter propeller (Liu C, Song B, Wang H. Design and optimization of a variable diameter propeller[C] / / International Conference on Information Science, Electronics and Electrical Engineering.IEEE , 2014:291-295.), to e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64F5/00B64C11/40
CPCB64C11/40B64F5/00
Inventor 周洲范中允
Owner NORTHWESTERN POLYTECHNICAL UNIV
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