移動物體之熱質傳分析

Abstract

本文要目的在於研究發射室因飛行體飛離而衍生的相關熱流問題。飛行體發射後在短暫的時間飛離發射室，發射時將產生的大量廢氣，在發射室內滯留，無法迅速自然擴散於室外，嚴重影響鄰近人員的安全。卻解決上述問題須仰賴有效的排氣系統方足以勝任。此外，由於大量廢氣瞬間充滿發射室，造成室內壓力上升，導致室內儀器或結構的損壞，這方面問題亦是一大困擾。在過去鮮見發表文獻探討相關問題。 然而過去之研究基於數值計算上的限制，大多只能做到靜態模擬，無法做到噴流位置隨時間而改變，不符合實際之物理現象，因此本文運用流體力學數值計算軟體 STAR-CD 並配合運用滑動网格的方法加以解決之，以模擬飛體飛離發射室的狀況，從而瞭解所衍生的各種現象以謀求解決之方法。

The main aim of the study is to solve thermal and flowing problem induced by launching flying object from a silo. Generally, the flying object takes extremely short time to depart from the silo and produces huge amount of hazardous exhausted gas in it. The gas remains in the silo and can not quickly diffuse to the outside which seriously damage to the people in the neighborhood of the silo. Beside, the exhausted gas rapidly inflates in the silo which causes the pressure to be increased drastically and destroys the equipment in the silo. The above problems are extremely complicated, up to now a little literature investgated the problems. Due to the limitation of the numerical method, the most simulations are the static situation and hardly to simulate the real case that a flying object launched from a silo. As a result , a C. F. D code of “STAR-CD”is used to simulate transient situation of the flying object launched from a silo. The problems mentioned previously are examined in detail and also the method for improving the above problems is proposed.