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(单词翻译:双击或拖选)
Bladeless Wind-Power Generator1 is Friendly to Birds 新型风力发电机避免误伤鸟类
Wind turbines are efficient sources of cheap energy but also a source of concern as their huge spinning blades frequently kill birds and bats. A new type of wind generator developed in Spain offers a creative solution to that problem.
In 2002, Spanish inventor David Yanez saw a short film about the Tacoma Narrows Bridge in the U.S., collapsing2 in strong wind. It was a vivid example of the powerful vibrations3 wind can create when it blows past a long pole, such as a car antenna4 or even a stick of bamboo. It gave him the idea for a new type of wind-energy generator.
“The initial philosophy or spirit was to create a generator of dreams that had all the qualities one would want: It should be as cheap as possible, need as little maintenance as possible, the setup as simple as possible," he said.
Yanez and his friend Raoul Martin took the idea to an engineering firm, where they were told it would never work. Undiscouraged, they started experimenting on their own in a small wind tunnel they built.
Good initial results were repeated by a larger working model called Vortex installed in a nearby field.
“What we have is a mast, which is the top piece and acts as a blade," Yanez said. "It's constructed from the same material as a conventional generator, and what it does is it oscillates, transmitting the oscillation to a conventional alternator, which by its own oscillation converts the wind's energy into electric energy.”
Yanez said the output of the 6-meter-tall generator, and even that of smaller models, was better than expected. The Vortex creates about 30 percent less energy than a comparable bladed wind turbine, but it is lighter5 and cheaper to build and maintain. It is made mostly of reinforced plastic and has very few moving parts. Also, it does not create noise and — even more important for many environmentalists — it does not present a threat to passing birds.
The current prototype works at wind speeds ranging from 1.5 to 7 meters per second.
The inventors say the next step is building a 12.5-meter tall bladeless generator with a 4-kilowatt capacity that could power small businesses or individual homes, or provide supplemental power to a main grid6.
The commercial version of the Vortex Bladeless generator should be ready for the market by 2017.
1 generator | |
n.发电机,发生器 | |
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2 collapsing | |
压扁[平],毁坏,断裂 | |
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3 vibrations | |
n.摆动( vibration的名词复数 );震动;感受;(偏离平衡位置的)一次性往复振动 | |
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4 antenna | |
n.触角,触须;天线 | |
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5 lighter | |
n.打火机,点火器;驳船;v.用驳船运送;light的比较级 | |
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6 grid | |
n.高压输电线路网;地图坐标方格;格栅 | |
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