Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE Journal of the American Helicopter Society Pub Date : 2021-05-10 DOI:10.4050/JAHS.66.022008

A. Gardner, A. Weiss, J. Heineck, A. Overmeyer, H. Spooner, Dr. R. K. Jain, C. Wolf, M. Raffel

引用次数: 2

Abstract

A well-defined reference set of data for computational fluid dynamics and comprehensive code validation for a scaled helicopter main rotor with boundary layer transition in forward flight is presented. The boundary layer transition was measured using differential infrared thermography (DIT) on the top (suction) side of the NASA/Army “PSP rotor” in the NASA Langley 14-by-22-Foot Subsonic Tunnel. The tests used a FLIR X8500 SLS long-wave infrared camera to observe the three-bladed rotor. The boundary layer transition was detected for forward flight at an advance ratio of 0.3 (115 kt). The measured boundary layer transition positions are consistent with previous measurements and predicted boundary layer transition locations. A method for the analysis of DIT images for a rotor in forward flight is shown and validated based on computational analysis of a pitching airfoil with varying inflow, showing both qualitative and quantitative similarity to experimental data.

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用DIT测量PSP旋翼前飞边界层转捩

给出了一种具有边界层过渡的直升机主旋翼前飞计算流体动力学和综合代码验证的良好定义的参考数据集。在NASA Langley 14 × 22英尺亚音速隧道中，利用差示红外热像仪(DIT)对NASA/陆军“PSP旋翼”的顶部(吸力)侧进行了边界层过渡测量。试验采用FLIR X8500 SLS长波红外摄像机对三叶旋翼进行观测。在向前飞行时，边界层跃迁的超前比为0.3 (115 kt)。实测的边界层过渡位置与之前的测量和预测的边界层过渡位置一致。本文提出了一种旋翼前飞DIT图像分析方法，并通过对不同进流条件下俯仰翼型的计算分析验证了该方法的有效性，结果表明该方法在定性和定量上都与实验数据相似。

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

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