中文摘要：

在低速风洞中研究了弹性对40°切角三角翼气动特性的影响，用激光测振仪测量模型在气动载荷作用下的变形，实验结果表明：相对刚性机翼而言，弹性可以极大地改善低雷诺数下机翼的气动特性，使小迎角下的升力系数和升阻比明显提高，从而有利于飞行。另外，弹性机翼顶点最大平均变形出现的迎角为α=15°，这与刚性机翼前缘涡在机翼顶点破裂的迎角一致；而在失速迎角α=20°附近，机翼顶点和翼梢变形的方差最大。

英文摘要：

　The effect of elastic deformations on the aerodynamic performance of a delta wing with 40 deg sweep angle was studied in wind tunnel. The laser vibration measuring apparatus was used to measure the vibration mode and deformation of the wings. The experimental results indicated that, comparing with the rigid wing, the elastic wing can greatly improve the wing aerodynamic performance in low Reynolds number, increasing the lift coefficient and the lift-drag-ratio at small angles of attack, this is of great advantage to flight. Meanwhile, the angle of attack at which the mean deformation of the elastic wing apex achieves maximum is α = 15°, this value is nearly the same as the angle at which the vortex breaks down at the wing tip for the rigid wing; and the rms of both wing tips and apex reaches maximum value for elastic wing around the stall angle α=20°.