For faster navigation, this Iframe is preloading the Wikiwand page for 迎角.

迎角

图中的α为此翼剖面之迎角

迎角(英语:Angle of attack,缩写为AOA,常用希腊字母α表示)为空气动力学名词,为机翼翼弦自由流(或是相对风流的方向)之夹角;如为飞机迎角,定义则为机轴对相对风流之夹角。当机翼向迎角,向则为迎角。[1][2]

迎角有可能与俯仰角搞混。俯仰角是指翼弦与飞行器俯仰之夹角,而迎角是指与自由流之夹角。[3]

机翼要有升力,则必须要有迎角或是弧度(camber)。有弧度的机翼,其零升力迎角不为零,也就是在迎角0度时,有弧线的机翼就有升力。而对称翼不具弧线,所以在迎角0度时没有升力,必须要有迎角,机翼才能提供升力。

当机翼因其它因素干扰,此时对于该翼剖面的相对风速可能与飞行器的相对风速不一样,所以在翼剖面上的相对风速与翼弦之夹角才是有效迎角。最常见的情况为,在机翼翼尖的部分,因三维释放效应,空气由机翼下方往上翻,使得有效迎角变小,并造成额外的阻力,我们称这种阻力为诱导阻力,而原本的迎角与有效迎角之差为诱导迎角[4]

迎角传感器是测量飞机迎角的装置。一般情况下,迎角传感器都安装在飞行器的前端。[5]

相关条目

[编辑]

参考文献

[编辑]
  1. ^ Jonh Anderson. Fundamentals of Aerodynamics,4th. Edition. New York: McGRAW-Hill. 2005: 20. ISBN 0071254080. 
  2. ^ Warren Phillips. Mechanics of Flight. Hoboken: Wiley. 2004. ISBN 0471334588. 
  3. ^ Jonh Anderson. Aircraft Performance and Design. New York: McGRAW-Hill. 1999. ISBN 0071160108. 
  4. ^ Jonh Anderson. Fundamentals of Aerodynamics,4th. Edition. New York: McGRAW-Hill. 2005: 398. ISBN 0071254080. 
  5. ^ 贾玉红; 吴永康. 航空航天概论(第5版)习题集 2022年8月第一刷. 北京航空航天大学. 2017. ISBN 978-7512424876. 
{{bottomLinkPreText}} {{bottomLinkText}}
迎角
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install
{{::$root.activation.text}}

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!


Your input will affect cover photo selection, along with input from other users.

X

Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?