@KTzone » 貼圖 - 優質及有趣貼圖 » 難得的飛機突破音障的瞬間照片


2010-3-8 19:49 carpenterhk
難得的飛機突破音障的瞬間照片

難得的飛機突破音障的瞬間照片

飛行器在速度達到音速左右時,會有一股強大的阻力,
使飛行器產生強烈的振蕩,速度衰減這一現象被俗稱為音障。
當飛行器突破這一障礙後,
整個世界都安靜了,一切聲音全被拋在了身後!
那個白的東西,就是在突破音障的一瞬間,由於空氣氣流的不均衡攪動產生的,
一般情況下是看不到的,所以才珍貴。
是在高處用長焦+高ISO+高速快門+感應設備+高速練拍+大容量片盒,在飛機預計突破音障時 再計算出的方向拍攝無數次而成…..
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【音障 -簡介】:
音障,當物體(通常是航空器)的速度接近音速時,將會逐漸追上自己發出的聲波。
此時,由於機身對空氣的壓縮無法迅速傳播,將逐漸在飛機的迎風面及其附近區域積累,
最終形成空氣中壓強、溫度、速度、密度等物理性質的一個 突變面 -

震波(Shock Wave,又譯衝擊波、駭波、激波)面。
震波的形成是超音速飛行的典型特徵。震波面將增加空氣對飛行器的阻力,
這種因為音速造成提升速度的障礙被俗稱為 音障。

除此之外,穿音速飛行常常伴隨的一個效應稱為
普朗特-格勞厄脫 凝結雲(Prandtl-Glauert condensation clouds),
其特徵是一個以飛機為中心軸、從機翼前段開始向四周均勻擴散的圓錐狀雲團。
這是由於震波面後方因氣壓降低導致溫度的降低,進而引起水氣凝結導致。
水氣凝結變成微小的水珠後,肉眼看來就像是雲霧般的狀態。
這個低壓帶會隨著離機身的距離增加而迅速消失。

資料轉貼:[url=http://hk-leo.net/unusual/intriguing_no02_20s.htm]奇聞館[/url]
如登過,抱歉

2010-3-11 00:59 BSW
thank you for sharing

2010-5-4 02:15 capo
開了眼界~~ 又知道了新的事物~~ 謝份享

2010-5-6 01:13 swatch100
good

2010-5-30 17:59 gebi77
VERY GOOD
謝謝大大分享

2010-6-4 14:21 maxleehoyin
good...thx

2010-6-7 00:48 過路人123321
good job~

2010-6-7 13:34 yinghaojiao
不错不错,支持楼主

2010-6-11 06:48 hnzkss
VERY GOOD

VERY GOOD
謝謝大大分享

2010-7-3 11:46 ooo000
謝謝大大!感謝分享。

2010-7-3 15:45 大大小明
幾得意~
又學到新事物

2010-7-13 21:37 ka910999
多謝分享!!

2010-7-18 01:03 WILL1912
THX~~~~~~~~~~~~

2010-10-15 00:37 strike2012
不錯的資訊喔~支持 頂了
thank you so much ! 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