大展弦比机翼模型设计对翼型流场气动特性的影响

采用SST两方程湍流模型，通过求解非定常Navier-Stokes方程，模拟了大展弦比机翼风洞模型振动条件下的翼型流场，总结了翼型不同振动状况下的流场和气动力特点，分析了模型设计中的不同振动情况对风洞试验结果的影响。研究结果表明：在大展弦比机翼风洞模型的设计中，将翼型的重心设计在机翼的弹性轴之后，对风洞试验的精度较为有利。此结论对大展弦比机翼的风洞实验模型设计有指导意义。

The effects of wind-tunnel model design on flowfield and aerodynamic behavior for large aspect-ratio wings

By solving unsteady Reynolds-averaged Navier-Stokes equations with SST turbulence model, the flowfields of the vibrating airfoils for wing models with large aspect-ratio in wind tunnel experiments were simulated. The flowfield and aerodynamic behavior of airfoils vibrating in different types were summarized, and the effects of designed models in different cases on the flowfield and aerodynamic behavior were investigated. It is shown that the vibrations of the airfoil can cause large-scale unsteady separated vortex shedding if the vibration amplitude reaches to a certain amount. When the centre of gravity of the airfoil locates downstream the elastic axis of the wing, the elastic vibration will have less effects on the flowfields and the aerodynamic behavior. This conclusion is valuable to the wing model design for wing tunnel experiments, especially for wind with large aspect-ratio.