John L. Loth


This paper presents two alternatives to the shrouded propeller wind energy concentrator. Their operation is based on generating a low pressure area, with high local wind velocity, around the windmill rotor.

The two types of wind energy concentrators considered are: (1) the "obstruction type" concentrator where a vertical cylinder or vertical flat surface is used to produce high local velocities around two counter-rotating vertical axis rotors, and (2) the "vortex type" concentrator where a horizontal vortex is generated by a vertical high lift wing of finite span. The high local wind kinetic energy inside the vortex is harnessed by a horizontal axis rotor.

The performance parameters such as the power concentration ratio and the associated area ratio have been determined theoretically. Some preliminary experimental data are included.

Meeting Name

2nd Annual UMR-MEC Conference on Energy (1975: Oct. 7-9, Rolla, MO)

Document Type

Article - Conference proceedings


Wind and Solar Energy

Document Version

Final Version

File Type





© 1976 University of Missouri--Rolla, All rights reserved.