三维机翼大迎角低速绕流及其涡控制的数值模拟

通过数值求解三维非定常可压缩雷诺平均Navier-Stokes方程，研究了三维机翼大迎角低速绕流及其带表面周期性吹吸气的流动控制，并探讨了非定常质量引射作为外激发手段对机翼气动力特性的影响，计算表明，在机翼前缘附近的小区域内施加周期性吹吸气进行流动控制，这类外激发手段对三维机翼的大迎角分离流动的控制是可行的，通过选择适当的控制参数，尤其是合适的周期性激振频率，可以有效地改善气动力特性。

Numerical study on viscous flow and vortex control about finite span wings at high angles of attack

Viscous flows past finite span wings at high angles of attack are investigated numerically by solving the three dimensional Reynolds averaged Navier Stokes equations. The Baldwin Lomax algebraic model is used for qualitative understanding of the underlying physics of most high angle of attack flows and their controls. Vortex control by using a periodic blowing suction on the upper surface of the wing near the leading edge is performed. Most effective excitation frequency for improving the performance of viscous flow past the wing at high angles of attack is investigated. Based on the present calculated results, the separated unsteady flow can be effectively modulated by properly chosen periodic blowing suction with low level power input, and significant lift enhancement can be reached at appropriate forcing frequencies. The flow mechanism is also investigated by comparing the controlled and uncontrolled flow behaviors.