Multivaned Windmill
The mutivaned windmill, developed in the United States in the last half of the 19th century, consists of a number of small metal vanes set in a wheel. It was widely adopted by the end of the century, and thereafter its use spread through the world. As standardized, it has a wind wheel 8 feet in diameter with many steel blades set close together. Mounted on a steel tower about 35 feet high, this windmill is usually geared to a pump that can be detached and operated by hand. The mill can pump water from great depths for livestock, irrigation, or household use.
During the early 20th century, a steel tower multivaned windmill rose above nearly every farm in the Midwest and West, but the rapid advance of rural electrification during the 1930's eliminated most of them. However, they still remain in use in India and other developing countries.
Propeller Windmill
The propeller windmill, generally having two or three blades, came into use following the development of the airfoil propeller for aircraft in the 1920's. The propeller windmill typically is used in conjunction with a generator to provide electricity in isolated rural areas. Small propeller windmills provide electric power to a home or farm. Large propeller wind mills are experimental or under development. They provide electric power to a distribution network, as does an electric power station.
Beauchamp Smith, Palmer Putman, and co workers pioneered the development of the large propeller windmill. They built and operated a 1,250 kilowatt wind turbine and generator unit that delivered electricity to the network of the Central Vermount Public Service Corporation during 1941-1945.in the mid 1970's several organization, including the Aerowatt Corporation in France and the National Aeronautics and Space Administration, were pursuing the development of large wind generator systems.
No comments:
Post a Comment