Power-Torque Weighted Solidity

Power-Torque Weighted Solidity

The rotor power or torque coefficient can be written as

Assuming constant C(i and uniform inflow then the equivalent power-torque weighted solidity is

Подпись: оe =Подпись:Power-Torque Weighted Solidity(3.152)

The torque weighted solidity is analogous to the activity factor used in propeller design. It is also used in wind turbine design but rarely in helicopter design. Again, McVeigh & McHugh (1982) suggest a modification to the weighted solidity if swept tip blades are used so that

ae — 4 f o(r)r3 cos2 A(r) dr. (3.153)