A twofold analysis is performed on an experimental set-up comprising a low-Reynolds wind tunnel, with the aim of quantifying the effect of measurand uncertainties and operative condition variations in the lift and drag curves of a NACA0021 airfoil. The first part of the study focuses on an uncertainty analysis of basic measurands used for calculating standard aerodynamic magnitudes, showing the individual contributions of each of the factors affecting the overall uncertainty ranges. The second part intends to show how those uncertainties are propagated to lift and drag coefficients, and to calculate the effect of varying operative conditions on those curves. It is found that, when changes in operative conditions are left unattended, their influence on derived magnitudes may grow as large as to cause the resultant data to lie outside the estimated uncertainty intervals. Additionally, those variations are shown to depend non-linearly on the operative condition changes that produce them.

对包括低雷诺兹风洞的实验装置进行了双重分析，目的是量化NACA0021机翼升力和阻力曲线中测量不确定度和操作条件变化的影响。研究的第一部分着重于对用于计算标准空气动力学大小的基本被测量物的不确定性分析，显示影响整个不确定性范围的每个因素的各自贡献。第二部分旨在说明如何将不确定性传播到提升系数和阻力系数，并计算变化的操作条件对这些曲线的影响。发现，如果不注意操作条件的变化，它们对导出幅度的影响可能会增大到导致结果数据超出估计不确定性区间的程度。另外，这些变化被显示为非线性地取决于产生它们的操作条件变化。