Whirl Flutter Test of Swept-Tip Tiltrotor Blades

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE

Journal of the American Helicopter Society Pub Date : 2023-01-01 DOI:10.4050/jahs.69.012010

James Sutherland, Frederick Tsai, Anubhav Datta

引用次数: 0

Abstract

The first whirl flutter test of the Maryland Tiltrotor Rig (MTR) was recently completed in the Naval Surface Warfare Center Carderock Division (NSWCCD) 8- by 10-ft large subsonic wind tunnel. The MTR is a Froude-scaled, 4.75 ft diameter, three-bladed, semispan, floor-mounted, optionally powered, flutter rig. This paper focuses on the swept-tip blades developed for this test. The swept-tip begins at 80%R and sweeps aft 20° to alleviate whirl flutter. Whirl flutter testing was performed in four configurations for both blade geometries. The frequency and damping of the wing beam and chord bending were collected at wind speeds up to 100 kt. This paper directly compares whirl flutter results between the straight and swept-tip blades and demonstrates higher wing chord damping using swept-tip blades in freewheel conditions, even at lower flight speeds.

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倾转旋翼后倾桨叶旋涡颤振试验

马里兰倾转旋翼钻机(MTR)的第一次旋翼颤振试验最近在海军水面作战中心卡德洛克分部(NSWCCD) 8 × 10英尺大的亚音速风洞中完成。地铁是一个弗劳德规模，直径4.75英尺，三叶，半跨度，地板安装，可选的动力，颤振钻机。本文重点介绍了为此试验开发的后掠叶。后掠端从80%R开始，后掠20°，以减轻旋涡颤振。对两种叶片几何形状进行了四种构型的旋转颤振试验。在风速达到100kt时，收集了翼梁的频率和阻尼以及弦的弯曲。本文直接比较了直叶和后掠叶的旋涡颤振结果，并证明了在飞轮条件下，即使在较低的飞行速度下，后掠叶也具有更高的翼弦阻尼。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the American Helicopter Society 工程技术-工程：宇航

CiteScore

4.10

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of the American Helicopter Society is a peer-reviewed technical journal published quarterly (January, April, July and October) by AHS — The Vertical Flight Society. It is the world''s only scientific journal dedicated to vertical flight technology and is available in print and online. The Journal publishes original technical papers dealing with theory and practice of vertical flight. The Journal seeks to foster the exchange of significant new ideas and information about helicopters and V/STOL aircraft. The scope of the Journal covers the full range of research, analysis, design, manufacturing, test, operations, and support. A constantly growing list of specialty areas is included within that scope. These range from the classical specialties like aerodynamic, dynamics and structures to more recent priorities such as acoustics, materials and signature reduction and to operational issues such as design criteria, safety and reliability. (Note: semi- and nontechnical articles of more general interest reporting current events or experiences should be sent to the VFS magazine