公开(公告)号：US5181678A

公开(公告)日：1993-01-26

申请号：US650472

申请日：1991-02-04

申请人： Sheila E. Widnall ,  William S. Widnall ,  William E. Gorgen ,  Jeffrey T. Evernham

发明人： Sheila E. Widnall ,  William S. Widnall ,  William E. Gorgen ,  Jeffrey T. Evernham

IPC分类号： B64C3/48

CPC分类号： B64C3/48 ,  B63B2039/063 ,  Y02T50/145

摘要： A flexible airfoil section for a wing or a blade comprising a streamlined shape and an elastic structure whose stiffness distribution along its chord and span is tailored to provide a desirable cambered shape with proportional increases in camber with increases in lift, mounted to a supporting structure such that the airfoil sections are free to pivot about axes near their leading and trailing edges. In operation, the foil derives much of its lift from elastic bending deformation of its flexible shape, thereby achieving a higher lift than a symmetric foil at the same angle of attack while postponing the onset of flow separation and stall and, for operation in water, of ventilation and cavitation. A wing or blade of general planform comprising flexible elastic airfoil sections which can be used to stabilize, or to control the direction of travel of, as well as provide side force for, a watercraft such as a sailboat or a sailboard, or for application to a variety of aircraft components and configurations to provide lift and side force and as well can serve as the aerodynamic surfaces of various types of fluid machinery including fans, helicopter rotors and wind turbines operating in subsonic flow.

摘要翻译： 用于机翼或叶片的柔性翼型部分包括流线型形状和弹性结构，其弹性结构的刚度分布沿其弦和跨度被调整以提供期望的弧形形状，其具有随着升力的增加而具有正比增加的仰角，安装到支撑结构 机翼部分可以围绕其前缘和后缘附近的轴线自由枢转。 在操作中，箔从其柔性形状的弹性弯曲变形中获得大部分的升力，从而在相同的迎角下实现比对称箔更高的升力，同时延迟流动分离和失速的开始，并且在水中操作， 的通气和气蚀。 一般平面形式的机翼或叶片包括柔性弹性翼型部分，其可用于稳定或控制船舶如帆船或帆板的行驶方向以及为其提供侧向力，或用于 提供升力和侧力的各种飞行器部件和构造，以及可以用作各种类型的流体机械的空气动力学表面，包括在亚音速流中操作的风扇，直升机转子和风力涡轮机。