论文标题
升力和投球力矩逆转的机制
The Mechanism of Lift and Pitching Moment Reversal
论文作者
论文摘要
进行了对二维NACA-0009机翼以$ 12^o的攻击角度对单燃烧驱动的分离流动响应的实验。研究了单次致动后的升力和投球力矩逆转的机制。由涡流引起的下冲引起的高压的空间位置，导致升力和投球矩逆转。流场的适当正交分解（POD）表明，模式2具有相似的结构，产生了倾斜，并负责升力和俯仰矩逆转。另一方面，POD模式1代表机翼吸气侧反向流的方向和强度，负责提升。
The experiment of separated flow response to a single-burst actuation over a 2-D NACA-0009 airfoil at $12^o$ angle of attack was conducted. The mechanism of the lift and pitching moment reversal following the single-burst actuation was studied. A spatially localized region of high pressure caused by a vortices-induced downwash is responsible for the lift and pitching moment reversal. Proper orthogonal decomposition (POD) of the flowfield shows that mode 2 shares a similar structure that produces the downwash and is responsible for the lift and pitching moment reversal. On the other hand, POD mode 1, which represents the direction and strength of the reverse flow on the suction side of the airfoil is responsible for the lift enhancement.
