Airfoil and Blade for Low Wind Speed Turbine

Technology Overview

There are locations with low to moderate wind profiles that can potentially be utilised to convert wind energy to electrical energy. Most commercial turbines don't perform well under low wind velocities. However, this newly-developed wind turbine blade technology can operate at very low wind speed.  The turbine blades start moving with help from a laminar separation bubble controller. This controller allows an early transition of the flow from laminar to turbulent. It takes less wind speed to rotate the rotor (cut-in at 1.5 m/s), and performs 20% more efficient at lower wind speed (below 5 m/s) than the currently available turbine in the market has to offer.

Technology Features & Specifications

Blade construction and design are factors that decide the wind force required to rotate the blades. The blades have airfoil cross sections of different sizes and shapes. A force is produced when wind moves over the airfoil; a force perpendicular to the direction of the motion is called a lift, while a parallel motion is called a drag. Two major parameters involved in the design process are the design wind speed at which the turbine is expected to work at its highest efficiency point, and the tip speed ratio (ratio of the velocity of the rotor tip to the wind velocity) at the design point. When a turbine is designed specifically for a location, the historic wind profile at the sites are analysed, both in terms of strength and distribution of the prevailing wind. With this in mind, overall performance of the turbines can be maximised at specific sites.

Potential Applications

This wind turbine requires a relatively low wind speed to start producing power, hence, this turbine can be deployed and used almost, anywhere in the world. Increasing use of wind power as an alternative source of power, will reduce our dependency on fossil fuels and decreasing the CO2 emissions every year. The technology provider is currently exploring collaboration with Telco operators to provide source of power in remote locations for their cell tower base stations.

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