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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, but three. Now, you may think that if the point of a wind turbine is to capture wind, wouldn’t five blades capture more wind than three? And wouldn’t capturing more wind translate to generating more electricity? Why? The answer depends on what’s meant by capturing wind. The goal of an electricity generating turbine isn’t exactly to capture the most wind possible. It’s to capture wind with the greatest efficiency. And engineers have found that three blades is the most efficient and least troublesome way to harvest wind.
如果你曾經經營過風力發電的農村，你可能已經注意到，渦輪機，最可能有三個葉片。不是兩個，也不是五個，而是三個。現在，你可能會認為風力渦輪機的就是為了能盡可能多地捕捉到風，個葉片捕獲的風不是更多嗎？捕獲更多的風能從而產生更多的電力？為什么呢？答案取決于捕捉風的平均數。風力發電渦輪的目標是并不完全使要進坑捕捉到多的風。而是要最有效第捕捉風。工程師們發現，三個葉片是最有效地捕捉風，而且是最不麻煩的方式。
