The invention provides an annular propeller of an asymmetric structure and an aircraft, and belongs to the field of propellers, each propeller blade comprises a front section, a rear section and a transition section, and the transition section is connected between the free ends of the front section and the rear section and enables the propeller blades to form an annular shape; in the radial section of the annular propeller, a circle is drawn with the central axis as the circle center, the circle intersects with the guide edge and the following edge at two points, and the distance between the two points is the width of the propeller blade; the maximum distance between the outer contour of the transition section and the central axis in the radial direction of the annular propeller is the radius of each blade; and the widths or radiuses of the at least two paddles are different. By changing design parameters such as the thickness, the width and the rotation radius of the annular blades, the different blades on the annular propeller have asymmetry, and the asymmetrical annular propeller structure can disperse line spectrum noise at the blade frequency position and the blade frequency double frequency position to multiple frequencies; therefore, the line spectrum noise condition of the annular propeller under the single frequency is greatly reduced, and the noise reduction performance of the annular propeller is improved.
本发明提出了一种非对称结构的环形螺旋桨及航行器,属于螺旋桨领域,桨叶包括前段、后段及过渡段,过渡段连接在前段及后段的自由端之间并使桨叶围成环形;在环形螺旋桨径向断面中,以中心轴线为圆心画圆且该圆与导边及随边相交于两个点,以该两点的间距为桨叶的宽度;以过渡段外轮廓与中心轴线沿环形螺旋桨径向的最大间距为桨叶的半径;至少两个桨叶的宽度或者半径不同。本发明通过改变环形桨叶的厚度、宽度及旋转半径等设计参数,使环形螺旋桨上不同桨叶具有非对称性,非对称的环形螺旋桨结构能够将叶频处和叶频二倍频处的线谱噪声分散到多个频率,从而大幅降低环形螺旋桨在单一频率下的线谱噪声情况,提升环形螺旋桨的降噪性能。
Annular propeller of asymmetric structure and aircraft
一种非对称结构的环形螺旋桨及航行器
2024-11-12
Patent
Electronic Resource
Chinese
European Patent Office | 2024
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