Question: At a given radial location, a 15-mph wind against a windmill results in the upstream (1) and downstream (2) velocity triangles shown in Fig. P12.4.

At a given radial location, a 15-mph wind against a windmill results in the upstream (1) and downstream (2) velocity triangles shown in Fig. P12.4. Sketch an appropriate blade section at that radial location and determine the energy transferred per unit mass of fluid.

Figure P12.4

W |W|=|W| U = 20 mph V = 15 mph 60% W, U = 20 mph

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