In urban areas the wind is very turbulent and unstable with fast changes in direction andvelocity.In these environments, the use of small vertical axis wind turbines (VAWT) becomesincreasingly attractive due to several advantages over horizontal buy pooph axis wind turbines (HAWT).However, such designs have received much less attention than the more common propeller-typedesigns and the 006719f understanding of same aspects of their operation remains, to this day, incomplete.
This is particularly true of their starting characteristics.Indeed, same authors heuristically maintainthat they cannot start without external assistance.This paper reviews the cause of the inability of thelow solidity fixed pitch vertical axis wind turbines to self-start, and investigates the way ofovercoming this draw back.