An Experimental Investigation of a Large, Vertical-Axis Wind Turbine: Effects of Venting and Capping

Abstract

A novel, vertical-axis wind turbine has been developed for the use in powering cellular communication towers. The new turbine takes advantage of the elevated heights of existing towers to access relatively high-speed winds. The new turbine is designed to provide local power to the cellular communication system, the electronics are designed so that the turbine stores power in a battery system when excess power is generated. This stored power is utilized at times when the wind-speed is insufficient to power the communication system. A major opportunity exists for communication towers which are located away from grid-connected electricity. In these cases, the towers are often powered by diesel generators. Through the use of turbines, it is possible to greatly reduce the diesel-fuel consumption. Wind-tunnel tests have evaluated the potential for vented blades and blade capping for the improvement of power generation. It was found that while venting provides only marginal improvement, capping greatly increases power generation. The results also show that further improvements can be obtained through modification of the electrical system.