Windmills slow the air and cause it to fill a larger
Chapter 2, Problem 121P(choose chapter or problem)
Windmills slow the air and cause it to fill a larger channel as it passes through the blades. Consider a circular windmill with a \(7 -m\)-diameter rotor in a \(8 \mathrm{~m} / \mathrm{s}\) wind on a day when the atmospheric pressure is \(100 \mathrm{kPa}\) and the temperature is \(20^{\circ} \mathrm{C}\). The wind speed behind the windmill is measured at \(6.5 \mathrm{~m} / \mathrm{s}\). Determine the diameter of the wind channel downstream from the rotor and the power produced by this windmill, presuming that the air is incompressible.
FIGURE P2–121
Equation Transcription:
Text Transcription:
7-m
8 m/s
20 degree celsius
6.5 m/s
100 kPa
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