自由式握拳練 - 游泳討論

By Hedwig
at 2011-08-20T03:15
at 2011-08-20T03:15
Table of Contents
部分原文恕刪
http://zh.wikipedia.org/wiki/%E8%BF%8E%E8%A7%92
這就是原理 懶的點網頁的可以看一下
攻角(英文:Angle of attack,縮寫為AOA,常用希臘字母α表示。)為一空氣動力學之
名詞,基本的定義為機翼之翼弦與自由流(或是相對風流的方向)之夾角;如為飛機攻角
,定義則為機軸對相對風流之夾角。當機翼向上為正攻角,向下則為負攻角。
它有可能與俯仰角搞混。俯仰角是指翼弦與飛行器俯仰之夾角,而攻角是指與自由流之夾
角。
機翼要有升力,則必須要有攻角或是弧度(camber)。有弧度的機翼,其零升力攻角不為
零,也就是在攻角0度時,有弧線的機翼就有升力。而對稱翼不具弧線,所以在攻角0度時
沒有升力,必須要有攻角,機翼才能提供升力。
當機翼因其它因素干擾,此時對於該翼剖面的相對風速可能與飛行器的相對風速不一樣,
所以在翼剖面上的相對風速與翼弦之夾角才是有效攻角。最常見的情況為,在機翼翼尖的
部分,因三維釋放效應,空氣由機翼下方往上翻,使得有效攻角變小,並造成額外的阻力
,我們稱這種阻力為誘導阻力,而原本的攻角與有效攻角之差為誘導攻角。
以上轉至維基百科
所以游泳要躬起來的原因就是這樣
--
→ simonjen:不是用手掌壓水讓身體浮起來 把你的身體挺好 速度夠就會 08/18 21:46
→ simonjen:浮起來了 不是用手掌壓水 08/18 21:47
→ h????:推sim說的 這是白努力定律 08/19 06:05
http://zh.wikipedia.org/wiki/%E8%BF%8E%E8%A7%92
這就是原理 懶的點網頁的可以看一下
攻角(英文:Angle of attack,縮寫為AOA,常用希臘字母α表示。)為一空氣動力學之
名詞,基本的定義為機翼之翼弦與自由流(或是相對風流的方向)之夾角;如為飛機攻角
,定義則為機軸對相對風流之夾角。當機翼向上為正攻角,向下則為負攻角。
它有可能與俯仰角搞混。俯仰角是指翼弦與飛行器俯仰之夾角,而攻角是指與自由流之夾
角。
機翼要有升力,則必須要有攻角或是弧度(camber)。有弧度的機翼,其零升力攻角不為
零,也就是在攻角0度時,有弧線的機翼就有升力。而對稱翼不具弧線,所以在攻角0度時
沒有升力,必須要有攻角,機翼才能提供升力。
當機翼因其它因素干擾,此時對於該翼剖面的相對風速可能與飛行器的相對風速不一樣,
所以在翼剖面上的相對風速與翼弦之夾角才是有效攻角。最常見的情況為,在機翼翼尖的
部分,因三維釋放效應,空氣由機翼下方往上翻,使得有效攻角變小,並造成額外的阻力
,我們稱這種阻力為誘導阻力,而原本的攻角與有效攻角之差為誘導攻角。
以上轉至維基百科
所以游泳要躬起來的原因就是這樣
--
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