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    火箭的作用作文1000字

    文章作者: | 時間:2018-10-16 20:18 | 來源:

      火箭是以熱氣流高速向后噴出,利用產生的反作用力向前運動的噴氣推進裝置。它自身攜帶燃燒劑與氧化劑,不依賴空氣中的氧助燃,既可在大氣中,又可在外層空間飛行。火箭在飛行過程中隨著火箭推進劑的消耗,其質量不斷減小,是變質量飛行體。現代火箭可用作快速遠距離運送工具,如作為探空、發射人造衛星、載人飛船、空間站的運載工具,以及其他飛行器的助推器等。如用于投送作戰用的戰斗部(彈頭),便構成火箭武器。其中可以制導的稱為導彈,無制導的稱為火箭彈。

      火箭是目前唯一能使物體達到宇宙速度,克服或擺脫地球引力,進入宇宙空間的運載工具。火箭的速度是由火箭發動機工作獲得的。早在1903年齊奧爾科夫斯基就推導出單級火箭的理想速度公式V=ωLnMo/Mk被稱為齊奧爾科夫斯基公式。ω為發動機的噴氣速度、Mo和Mk。分別是火箭的初始質量和發動機熄火(推進劑用完)時的質量。Mo/Mk被稱為火箭的質量比。

      由這個公式可知,火箭的速度與發動機的噴氣速度成正比,同時隨火箭的質量比增大而增大。即使使用性能最好液氫液氧推進劑,發動機的噴氣速度也只能達到4。3~4。4公里/秒。因此,單級火箭不可能把物體送入太空軌道,必須采用多級火箭,以接力的方式將航天器送入太空軌道。

      火箭用于運載航天器叫航天運載火箭,用于運載軍用炸彈叫火箭武器(無控制)或導彈(有控制)。航天運載火箭一般由動力系統、控制系統和結構系統組成,有的還加遙測、安全自毀和其他附加系統。

      多級火箭各級之間的聯接方式,有串聯、并聯和串并聯幾種。串聯就是把幾枚單級火箭串聯在一條直線上;并聯就是把一枚較大的單級火箭放在中間,叫芯級,在它的周圍捆綁多枚較小的火箭,一般叫助推火箭或助推器,即助推級;串并聯式多級火箭的芯級也是一枚多級火箭。

      多級火箭各級之間、火箭和有效載荷及整流罩之間,通過連接一分離機構(常簡稱為分離機構)實現連接和分離。分離機構由爆炸螺栓(或爆炸索)和彈射裝置(或小火箭)組成。平時,它們由爆炸螺栓或爆炸索連成一個整體;分離時,爆炸螺栓或爆炸索爆炸,使連接解鎖,然后由彈射裝置或小火箭將兩部分分開,也有借助前面一級火箭發動機啟動后的強大射流分開的。

      火箭技術是一項十分復雜的綜合性技術,主要包括火箭推進技術、總體設計技術、火箭結構技術、控制和制導技術、計劃guǎn lǐ技術、可靠性和質量控制技術、試驗技術,對導彈來說還有彈頭制導和控制、突防、再入防熱、核加固和小型化等彈頭技術。

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