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[科学美国人60秒] 【整理】SSS 2008-07-08

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This is Scientific American 60 second science. I’m Cynthia Graber

 

This will just take a minute.

 

Whales and dolphins were molded by evolution to glide through water. We’ve being trying to create streamline designs ourselves for structures such as winter turbine blazes. Now researchers are examining the flippers, fins and tiles of our water dwelling cousins to learn how to improve engineering designs

 

Dr. Frank Fish, yes that’s really his name, from West Chester University in Pennsylvania presented the research July 8th, at the society for experimental biology’s annual meeting in Marseille Here’s one example of the way Dr. Fish’s research is being applied.

 

Whale flippers have a bumpy edge, this makes little sense to engineers; they’ve designed structures like winds and blazes that ensure a steady airflow. But it turns out the unsteady flow over the more complex shape increases lift and reduces drag much better than any previous man-made design. It has to do with something called vortices, These are small tornado shaped water formations in an animals’ wake. (什么意思?) T

 

he bumps on the whales’ flipper help form vortices, that generate more lift more smoothly. Engineers are using this insight to design an entirely new wind turbine blade so that we can generate power from wind as efficiently as whales and dolphins fly through the water.

 

Thanks for the minute.For Scientific American's 60-Second Science,I'm Cynthia Graber.

[ 本帖最后由 hanqialice 于 2008-7-9 17:30 编辑 ]
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