MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

135a vertical shaft, the wind will flow into one half, creating a rotatingmoment, and then %pill" into the other half cylinder, causing a similareffect. Savonious rotors rarely attain efficiencies above 31 percent, butdue to their easy construction are often found in developing areas.(Performance testing has been done at Brace Institute on a savonius rotor--see Simonds and Bodek, 1964.) The anemometer-type windmill in Figure 5.7 isalso easy to construct using cylinder halves and is also functional inwind from any direction.For the most part, however, the American-style windmill is the mostcommon for water lifting purposes, with some recent applications of thehigher-speed propeller designs for use with centrifugal pumps. Muchresearch is underway or being initiated to improve windmill designs,particularly for the generation of electricity (Putnam, 1948 and Hamilton,1975). However, much of the new knowledge in this general area is beingutilized for water lifting and other direct power uses. Work is alsobeing done to evaluate the potential of wind power in various areas of theworld to facilitate econo;nic analyses of utilizing windmills (e.g., Latif,1972).Windmills such as the American-style are utilized for low-speed/lowpowerapplications such as driving a piston pump, however, with a centrifugalclutch and appropriate gearing,they can be used to drive rotodynamic androtary pumps (Golding, 1962). High speed/low starting torque designs, aremore readily adaptabie to driving ro todynamic pumps.The Brace Institute utilized a three-blade “airscrew” windmill to powera vertical turbine pump which supplied water to a sprinkler irrigation system.This study was conducted in Barbados, West Indies.The pump was run at