[流言] Live 流言終結者 子彈會轉彎
看板DiscoveryNGC (Discovery/國家地理/旅遊生活頻道)作者th11211 (Camel)時間16年前 (2009/09/03 22:56)推噓31(31推 0噓 29→)留言60則, 19人參與討論串1/10 (看更多)
想開Live文好多次了~每次MB首播版上人氣都還不錯!
想到這是今年最後一次,再不行動就要等明年了...
今天要驗證刺客聯盟裡的"子彈會轉彎"
想必是很歡樂的一集~
歡迎大家討論啊!
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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.113.177.49
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查到了~ 音爆雲:
所為“音爆雲”,其實並不總是伴隨著音爆現象的產生,也不是音障被突破時所產生的衝
擊波,而是飛機正好要加速穿過音障(sound barrier)時,瞬間四周空氣壓力迅速減少,
溫度隨即驟降,發生了普朗特-格勞爾奇點(Prandtl-Glauert Singularity)效應,在飛機
的周圍有時候會有一團雲霧所形成的。由於在飛機的速度快要接近音速時,周邊的空氣受
到聲波疊合而呈現非常高壓的狀態,因此一旦飛機穿越音障後,周圍壓力將會陡降。如果
當時空氣比較潮濕,有時陡降的壓力所造成的瞬間低溫,會使前端高溫汽化水,迅速液化
,如果溫度足夠低,達到冰點,還可以與周邊液態水凝結變成微小的冰,肉眼看來就像是
雲霧般的狀態。但由於這個低壓帶會隨著空氣離機身的距離增加而恢復到常壓,因此整體
看來形狀像是一個以物體為中心軸、向四周均勻擴散的圓錐狀雲團。這種雲只能在特定的
天氣條件下才會出現,而且這些由水汽組成的暈輪只能持續幾秒鐘。
※ 編輯: th11211 來自: 140.113.177.49 (09/04 00:16)
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