Turbine blade takes star turn

Researchers at

collaborated with blad manufacturer 

to develop a wind turbine blade design that promises to be more efficient than current designs. It should significantly reduce the cost-of-energy (COE) of wind turbines at low-wind-speed sites.

Named ‘STAR’ for Sweep Twist Adaptive Rotor, the blade is the first of its kind produced at a utility-grade size. Its most distinctive characteristic is a gently curved tip, termed ‘sweep,’ which unlike the vast majority of blades in current use, is specially designed for low-wind-speed regions like the American Midwest.

The sites targeted by this effort have annual average wind speeds of 5.8mps, measured at a height of 10m. Such sites are abundant in the US and would increase by 20-fold the available land area that can be economically developed for wind energy.

Sized at 27.1m, almost 3m longer than the baseline it will replace, the blade improves energy capture at lower wind speeds. Instead of the traditional linear shape, the blade features a curvature toward the trailing edge, which allows the blade to respond to turbulent gusts in a manner that lowers fatigue loads on the blade. It is made of fibreglass and epoxy resin.