Supplementary data for the article: An integrated measurement approach for the determination of the aerodynamic loads and structural motion for unsteady airfoils

This data set contains the figures (.mat files) and the raw data (.dat files) that is presented in the article "An integrated measurement approach for the determination of the aerodynamic loads and structural motion for unsteady airfoils". In this work, the structural motion and unsteady aerodynamic loads of a pitching airfoil model that features an actuated trailing edge flap are determined experimentally using a single measurement and data processing system. This integrated approach provides an alternative to the coordinated use of multiple measurement systems for simultaneous position and flow field measurements in large-scale fluid–structure interaction experiments. The measurements in this study are performed with a robotic PIV system using Lagrangian particle tracking. Flow field measurements are obtained by seeding the flow with helium-filled soap bubbles, while the structural measurements are performed by tracking fiducial markers on the model surface. The unsteady position and flap deflection of the airfoil model are determined from the marker tracking data by fitting a rigid body model, that accounts for the motion degrees of freedom of the airfoil model, to the measurements. For the determination of the unsteady aerodynamic loads (lift and pitching moment) from the flow field measurements, two different approaches are evaluated, that are both based on unsteady potential flow and thin airfoil theory. These methods facilitate an efficient non-intrusive load determination on unsteady airfoils and produce results that are in good agreement with reference measurements from pressure transducers.<br>

本数据集包含论文《非定常翼型气动载荷与结构运动测定的一体化测量方法》（"An integrated measurement approach for the determination of the aerodynamic loads and structural motion for unsteady airfoils"）中呈现的图表数据（.mat格式文件）与原始实验数据（.dat格式文件）。本研究采用一套集成式测量与数据处理系统，通过单次实验对带有主动控制后缘襟翼的俯仰翼型模型的结构运动与非定常气动载荷进行实验测定。该一体化测量方案为大型流固耦合（fluid–structure interaction）实验中采用多套测量系统协同开展位置与流场同步测量的传统方案提供了替代选择。本研究的测量工作依托采用拉格朗日粒子追踪技术的机器人式粒子图像测速（Particle Image Velocimetry, PIV）系统完成。流场测量通过向流场中充入氦气肥皂泡实现示踪，结构运动测量则通过追踪模型表面的基准标记点完成。研究人员通过将包含翼型模型全部运动自由度的刚体模型拟合至标记点追踪所得的测量数据，即可确定翼型模型的非定常位置与襟翼偏转角。针对从流场测量数据中提取非定常气动载荷（升力与俯仰力矩）的任务，本研究评估了两种基于非定常势流（unsteady potential flow）与薄翼理论（thin airfoil theory）的不同处理方法。上述方法可实现非定常翼型的高效非侵入式载荷测定，所得结果与压力传感器的参考测量值具有较高的吻合度。