時差N小時:風(fēng)力發(fā)電機(上)

　　If you’ve ever driven by a wind farm,you may have noticed that the turbines most likely have three blades. Not two, not five, butthree. Now, you may think that if the point of a wind turbine is to capture wind, wouldn’t fiveblades capture more wind than three? And wouldn’t capturing more wind translate togenerating more electricity? Why? The answer depends on what’s meant by capturing wind. Thegoal of an electricity generating turbine isn’t exactly to capture the most wind possible. It’s tocapture wind with the greatest efficiency. And engineers have found that three blades is themost efficient and least troublesome way to harvest wind.

　　如果你曾經(jīng)經(jīng)營過風(fēng)力發(fā)電的農(nóng)村，你可能已經(jīng)注意到，渦輪機，最可能有三個葉片。不是兩個，也不是五個，而是三個。現(xiàn)在，你可能會認為風(fēng)力渦輪機的就是為了能盡可能多地捕捉到風(fēng)，個葉片捕獲的風(fēng)不是更多嗎?捕獲更多的風(fēng)能從而產(chǎn)生更多的電力?為什么呢?答案取決于捕捉風(fēng)的平均數(shù)。風(fēng)力發(fā)電渦輪的目標是并不完全使要進坑捕捉到多的風(fēng)。而是要最有效第捕捉風(fēng)。工程師們發(fā)現(xiàn)，三個葉片是最有效地捕捉風(fēng)，而且是最不麻煩的方式。