Finite wing effects [Aerodynamics #15] скачать в хорошем качестве

Finite wing effects [Aerodynamics #15]

In this lecture, we consider the reality that our wings are not idealized 2D foils with infinite span, and there are finite wing end effects to consider. Specifically, the pressure difference near the wing tip induces a roll-up of velocity and creates the tip vortex. This tip vortex induces a downwash velocity on the foil along the span, and locally changes the effective angle of attack and adds drag (called induced drag). We use the Biot-Savart Law to develop tools to explore the influence of theoretical semi-infinite vortices (which is what a tip vortex is) and also explore the rule of vortex filaments with the Helmholtz Vortex Theorems. Looking forward, we will use these tools to analyze the impact of the tip vortex on the wing to be able to predict downwash and change in performance. Free downloadable notes (PDF with white background) can be found at my website: https://sites.udel.edu/vanburen/educa...