Variable pitch propeller for unmanned aerial vehicle

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Variable pitch propeller for unmanned aerial vehicle

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ZHOU DAN / HUANG YOU / LU GUOJING / ZHANG WEN / ZHOU JUN

The invention relates to a propeller, in particular to a variable pitch propeller for an unmanned aerial vehicle, which comprises a blade body formed by sequential smooth transition of fourteen airfoil sections distributed along the length direction of the blade, and the chord length c of each airfoil section is 134-57mm; with the first airfoil section of the root of the blade body as a reference, the distance r from the other airfoil sections to the first airfoil section of the root of the blade body is 48-624 mm; with a plane A defined by a chord line of a first airfoil section located at the root of the blade body and a rotation center line of the blade body as a reference, included angles beta formed by chord lines of other airfoil sections and the plane A range from 3.3 degrees to 21.8 degrees; and the distance from the front edge of each airfoil section to the rotation center of the blade body is 38%-42% of the chord length. According to the scheme, the problems of short takeoff distance and low high-altitude long-time cruising efficiency when the diameter of a small and medium-sized unmanned aerial vehicle propeller in the prior art is 1.92 m magnitude are solved.

本发明涉及螺旋桨，具体为一种无人机用变距螺旋桨，包括沿桨叶的长度方向分布的十四个翼型截面依次平滑过渡而形成的桨叶本体，所述翼型截面的弦长c在134㎜‑57㎜；以桨叶本体的根部的第一个翼型截面为参照，其余翼型截面到桨叶本体的根部的第一个翼型截面的距离r在48㎜‑624㎜；以位于桨叶本体的根部的第一个翼型截面的弦长线与桨叶本体自身的转动中心线所限定的平面A为参照，其余翼型截面的弦长线与平面A所形成的夹角β在3.3°‑21.8°；每个所述翼型截面的前缘到桨叶本体自身的转动中心的距离均为弦长的38%‑42%。本方案解决了现有技术中小型无人机螺旋桨直径为1.92米量级时，起飞距离短和高空长时间巡航效率低的问题。