关键词: 层流翼型, 剪切层自适应, IDDES, 流动控制, 流动分离

Abstract: High subsonic laminar aircraft design is a key research direction of aircraft. Laminar airfoils play an important role in improving key indicators such as aerodynamic performance, flight range, and flight time. However, their aerodynamic characteristics are worse than those of traditional airfoils at high angles of attack and low speed. A shear layer adaptive improved delay detached eddy simulation method is used to analyze and improve the laminar airfoil of the laminar verifying aircraft. The flow separation at the leading area caused by the three-dimensional effect of the airfoil itself and the wing/body junction at high angles of attack are suppressed and keep good aerodynamic characteristics at a low Mach and high angle of attack by the modified laminar airfoil. The results show that by modifying the leading edge of the laminar flow airfoil, the flow separation can be significantly suppressed at low speed, thus significantly improving the aerodynamic characteristics of the laminar flow airfoil while keeping good aerodynamic characteristics at high Mach number.

Key words: laminar airfoil, shear layer adaptive, Improved Delay Detached Eddy Simulation (IDDES), flow control, separation flow