2.22. Velocity profiles are measured at the upstream end (surface 1) and at the downstream end (surface 2) of the control volume shown in Fig. P2.22. Surfaces 3 and 4 are streamlines. If the flow is incompressible, two dimensional, and steady, what is the drag coefficient for the airfoil? The vertical dimension Hp 0.025c. The pressure is poo (a constant) over the entire surface of the control volume. (This problem is an extension of Problem 2.10.) = u = U Hu 4 Streamline Hp=0.025c u = U-(1-0.5 cos) Streamline Answer: Ca=0.01933) Figure P2.22