Supporting data belonging to publication: "Experimental study of transonic flow over a wind turbine airfoil"

The dataset intends to support the publication "Experimental study of transonic flow over a wind turbine airfoil" by Aditya, Vitulano, De Tavernier, Schrijer, van Oudheusden, von Terzi in Wind Energy Science. The data includes planar PIV measurements done for a model of the FFA-W3-211 airfoil, most commonly used in reference wind turbine tips, for different inclinations at high subsonic freestream Mach numbers (0.5 - 0.6) with total pressure of 2.0 bar and total temperature of approximately 288 K. The measurements were carried out in the Transonic-Supersonic wind tunnel (TST-27) at the High-Speed Lab of Delft University of Technology. The raw images were recorded with a pair of LaVision Imager sCMOS cameras with overlapping fields-of-view, each operating at a full spatial resolution of 2560 x 2160 pixels and recording at an acquisition rate of 15 Hz to match the repetition rate of the Nd:YAG laser (532 nm) used to illuminate the DEHS seeder particles in the flow. A Lavision Programmable Timing Unit (PTU) was employed to synchronize the laser and the cameras. The acquired raw images were processed using LaVision DaVis to obtain streamwise and transverse velocity fields at a spatial resolution of 0.164 mm, or around 0.24% of the model chord. Subsequently, the velocity fields for both cameras were combined using a linear ramp in the overlap region to provide a full field-of-view spanning 142 x 82 % of the model chord in the streamwise and transverse directions, respectively. In total, 1200 snapshots were recorded for each case. The current dataset contains the processed, combined (full-field) velocity fields (.mat) along with a (post)processing code (.m) to calculate the local Mach number fields, shock locations, etc. from the velocity fields.

本数据集旨在支撑Aditya、Vitulano、De Tavernier、Schrijer、van Oudheusden与von Terzi发表于《风能科学》(Wind Energy Science)的论文《跨声速下风力机翼型流动实验研究》(Experimental study of transonic flow over a wind turbine airfoil)。本数据集包含针对FFA-W3-211翼型模型开展的平面粒子图像测速（planar PIV）测量数据，该翼型是参考型风力机叶尖的常用翼型。实验涵盖高亚声速自由来流马赫数（0.5~0.6）下的多种攻角工况，实验总压为2.0 bar，总温约为288 K。本次测量在代尔夫特理工大学高速实验室的跨超声速风洞（Transonic-Supersonic wind tunnel, TST-27）中完成。原始图像由两台带有重叠视场的LaVision Imager sCMOS相机采集，单台相机的全幅空间分辨率为2560×2160像素，采集帧率设为15 Hz，以匹配用于照亮流场中二乙基己基己二酸酯（DEHS）示踪粒子的掺钕钇铝石榴石（Nd:YAG）激光器（波长532 nm）的重复频率。实验采用LaVision可编程时序单元（Programmable Timing Unit, PTU）实现激光器与相机的同步。采集得到的原始图像经LaVision DaVis软件处理后，可得到流向与横向速度场，其空间分辨率为0.164 mm，约为翼型模型弦长的0.24%。随后，通过在重叠区域采用线性渐变融合的方式，将两台相机获取的速度场进行拼接，最终得到完整视场：在流向与横向方向上，视场范围分别覆盖翼型模型弦长的142%与82%。每个实验工况共采集1200组瞬态测量图像。本数据集包含处理拼接后的全视场速度场数据（格式为.mat），以及用于从速度场中计算局部马赫数场、激波位置等参数的后处理代码（格式为.m）。