Aerodynamic performance of an OPTIMIST full-scale sail for various sail trims: An experimental study

IF 1.8 4区工程技术 Q3 ENGINEERING, MECHANICAL Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Pub Date : 2024-08-29 DOI:10.1177/09544062241272701

Despoina Mougakou, Christina Georgantopoulou, Dimitrios Mathioulakis

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Abstract

Based on wind tunnel tests, the aerodynamic behaviour of a full-scale sail (2.7 m × 2 m) of the OPTIMIST boat is presented for various sail trims. The sail with its vertical mast was attached to a six component balance in a 3.5 m × 4.5 m cross-section of a closed circuit wind tunnel at the National Technical University of Athens. The aerodynamic force and moment vectors applied on the sail were measured for various angles of attack in the interval 10°–40°, for a free stream of 5 m/s and for four shapes of the sail, varying the tension applied on it. Its three dimensional shape was reconstructed using a commercial motion capture system, including three infra-red cameras and a number of spherical reflectors attached to the sail surface. Lift, drag, moment coefficients and the centre of pressure are presented as a function of the angle of attack and the sail trim, as well as the characteristic geometric features of the sail at various horizontal sections like the maximum camber and its location, its inlet-outlet and twist angles.

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OPTIMIST 全尺寸风帆在不同风帆修剪下的空气动力性能：实验研究

根据风洞试验，介绍了 OPTIMIST 游艇的全尺寸风帆（2.7 米 × 2 米）在不同风帆修剪下的空气动力学特性。在雅典国立技术大学的闭路风洞中，风帆及其垂直桅杆被固定在一个横截面为 3.5 米 × 4.5 米的六分量天平上。在 10°-40°之间的不同攻角、5 米/秒的自由流和四种形状的风帆上，测量了施加在风帆上的空气动力和力矩矢量，并改变了施加在风帆上的张力。使用商用运动捕捉系统重建了帆的三维形状，该系统包括三台红外摄像机和一些连接在帆表面的球形反射器。升力、阻力、力矩系数和压力中心作为攻角和风帆修剪的函数，以及风帆在不同水平截面上的几何特征，如最大外倾角及其位置、入口-出口角和扭转角。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 工程技术-工程：机械

CiteScore

3.80

自引率

10.00%

发文量

625

审稿时长

4.3 months

期刊介绍： The Journal of Mechanical Engineering Science advances the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in engineering.