Page 294 - Handbook of Energy Engineering Calculations

aerodynamic design—running at high rotational speeds where the ratio of the
blade-tip-speed-to-free-flow-speed of the windstream is 5 or 6—will have
power coefficients as high as 0.47. Figure 3 outlines the maximum power
coefficients obtainable for several rotor designs. Figure 4 plots the typical
performance curves of a number of different wind machines.”

FIGURE 3 The maximum power coefficients for several types of
rotor designs. (Mechanical Engineering.)

Choose a horizontal-axis double-bladed rotor wind machine for this

application with a power coefficient C of 0.375. This type of wind machine
p
is being chosen because (1) the power coefficient is relatively high (0.375),