Washington, July 8 : Scientists have used the shape of whale and dolphin flippers as inspiration for the creation of a completely novel design for wind turbine blades.
Though sea creatures have evolved over millions of years to maximize efficiency of movement through water; humans have been trying to perfect streamlined designs for barely a century.
By studying the flippers, fins and tails of whales and dolphins, these scientists have discovered some features of their structure that contradict long-held engineering theories.
Some observations by scientists like Dr Frank Fish from West Chester University, are already being applied to real life engineering problems, a concept known as biomimetics.
The shape of whale flippers with one bumpy edge has inspired the creation of a completely novel design for wind turbine blades.
This design has been shown to be more efficient and also quieter, but defies traditional engineering theories.
Engineers have previously tried to ensure steady flow patterns on rigid and simple lifting surfaces, such as wings.
"The lesson from biomimicry is that unsteady flow and complex shapes can increase lift, reduce drag and delay 'stall', a dramatic and abrupt loss of lift, beyond what existing engineered systems can accomplish," Dr Fish said.
"There are even possibilities that this technology could be applied to aeronautical designs such as helicopter blades in the future," he added.
The work centres on studies of vortices, tornado-shaped water formations that develop in the wake of the animals.
"In the case of the humpback whale, vortices formed from tubercles (bumps) on the front edge of flippers help to generate more lift without the occurrence of stall, as well as enhancing maneuverability and agility," explained Dr Fish.
"In the case of the tails of dolphins, vortices are formed at the end of the up and down strokes. These vortices are involved in the production of a jet in the wake of the dolphin that produces high thrust. By regulating the production of the vortices, the dolphin can maximize its efficiency while swimming," he added.
Story first published: Tuesday, July 8, 2008, 15:07 [IST]