翼に渦が干渉する場合の翼周りの流れと発生する空力騒音に関する研究

抄録

Recently, it has been a problem of aerodynamic noise radiated from airfoils. Therefore, the authors made wind tunnel tests to measure airfoil noise and static pressure on an airfoil (NACA0012 model) in turbulent flow. In additon, the authors made Large Eddy Simulation to simulate vorticity distributions around airfoil and airfoil noise. In this study, the authors use an airfoil and a cylinder to examine influences of vortices with a particular size and fluctuation. Then, the authors measured and simulated airfoil noise and static pressure in varying position in the vertical direction (-10 to +10 mm) of the cylinder placed in the upstream side of the airfoil to change interference position. As a result, it has become clear that airfoil nose is increased when interference position is in the stagnation point. And the airfoil has larger pressure fluctuation at leading edge in this case.