Parametric Viscous Analysis of Gust Interaction with SD7003 Airfoil
Parametric Viscous Analysis of Gust Interaction with SD7003 Airfoil
复制标题
阵风与 SD7003 翼型相互作用的参数粘性分析
作者：
V. Golubev;Timothy M. Hollenshade;L. Nguyen;M. Visbal
建立了SD7003翼型与非均匀非定常来流非线性相互作用的高精度数值粘性分析方法。研究的重点是MAV应用中典型的低雷诺数非定常流场，其中阵风遭遇会引起特别显著的气动和气动弹性响应。建立了有效的源模型，通过控制动量方程中的源项在计算域中引入具有指定振幅、频率和持续时间的锐边和时谐阵风扰动。对不同定常翼型载荷下阵风-翼型相互作用进行了参数化分析，并与等效俯仰-斜坡和时谐俯仰模拟进行了比较。此外，还将所得结果与基于无粘不可压非定常气动理论的预测结果进行了比较。研究揭示了不同阵风和俯仰激励下观察到的非粘非定常力和粘性非定常力的复杂相互作用，并确定了相应的阵风和俯仰翼型响应之间的相似程度。
The work develops a high-accuracy numerical viscous analysis of nonlinear interaction of SD7003 airfoil with non-uniform, unsteady incoming flow. The study is focused on the low-Re number unsteady flows typical of MAV applications in which a gust encounter can induce a particularly significant aerodynamic and aeroelastic response. Efficient source models are developed to introduce sharp-edge and time-harmonic gust perturbations with specified amplitude, frequency and duration inside the computational domain through the source terms in the governing momentum equations. Parametric analysis of gust-airfoil interactions for different steady airfoil loads is conducted in comparison with equivalent pitch-ramp and time-harmonic pitching simulations. In addition, all obtained solutions are compared with corresponding predictions based on the inviscid, incompressible unsteady aerodynamic theory. The study reveals complex interaction of inviscid and viscous unsteady forces observed for different gust and pitching excitations, and identifies the degree of similarity between the corresponding gust and pitching airfoil responses.