Page 293 - Handbook of Energy Engineering Calculations
P. 293
FIGURE 2 Wind machines come in all shapes and sizes. Some of
the more practical design categories are illustrated in this taxonomy.
(Mechanical Engineering.)
Continuing, Hirschfeld notes, “The power coefficient of an ideal wind
machine rotor varies with the ratio of blade tip speed to free-flow windstream
speed, and approaches the maximum of 0.59 when this ratio reaches a value
of 5 or 6. Experimental evidence indicates that two-bladed rotors of good
