摘要
将一种后缘带开缝旋转圆筒固定小翼的新型颤振激励器简化为二维升力系统,通过数值模拟方法,研究了它的静态和动态气动特性。计算得到翼型在不同来流速度、不同迎角下,翼型升力随着圆筒转动相位角的变化关系。分析了在开缝圆筒的相位角位于45°±3°和135°±3°等区间时翼型升力出现突变的原因。并且发现翼型升力幅值随着翼型后缘与圆筒前缘间距的增大而单调下降。开缝圆筒以恒定转速转动时的动态气动力模拟结果显示,在机翼上产生了近似正弦变化的升力,并且在一个周期内,升力的波峰和波谷的幅值相差较小,满足颤振激振的要求。
A new type of flutter exciter is simplified as a two dimensional lifting surface with a slotted rotating cylinder at its trailing edge. The excitation characteristics are studied by examining its static and dynamic aerodynamic characteristics using CFD approach. The lifts of the airfoil which vary with the variation of rotating phase angles of the cylinder are calculated at different angles of attack and airflow velocities. The abrupt change of lift under static conditions at phase angle of 45°±3° and 135°±3° is also examined and explained. It is found that the amplitude of the lift decreases monotonically with the distance between the trailing edge of the airfoil and the leading edge of the cylinder increasing. The numerical simulation results for the unsteady aerodynamics demonstrate that it can generate a sine wave exciting force when the cylinder is rotating at a constant rate.
出处
《工程力学》
EI
CSCD
北大核心
2009年第11期222-227,共6页
Engineering Mechanics
基金
国家自然科学基金项目(10672135)
新世纪优秀人才支持计划项目(NCET-04-0965)
关键词
颤振激励器
数值模拟
激励特性
升力突变
引射
flutter exciter
numerical simulation
excitation characteristics
abrupt lift drop
ejector
