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研究生:尹昌榮
論文名稱:砲口制退器對中間彈道影響之數值研究
指導教授:戴昌賢戴昌賢引用關係
學位類別:碩士
校院名稱:中正理工學院
系所名稱:兵器系統工程研究所
學門:軍警國防安全學門
學類:軍事學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:109
中文關鍵詞:砲口制退器中間彈道
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砲口制退器為火砲設計工作中重要的一環。由於砲口制退器對於降低後座力、增加火砲穩定度的影響甚劇,且火砲在發射過程中,流場經過砲口過程極為短暫,實驗觀察不易,且未經模擬測試過程,冒然進行實驗,危險性極高。因此本研究的目的,即在建立以數值模擬(計算流體力學CFD)的方法,探討砲彈在通過砲口制退器時,所產生的氣動力變化問題。
本研究在數值方法上採用上風 TVD (Total Variation Deminishing)數值法解無黏性Euler方程組;採用人工耗散項最小的Roe''s Solver,配合Kappa高階MUSCL Scheme解決在空間通量計算方面的問題,而在時間離散方面,則採用具二階精度的Hancock法則進行時間積分。並採一真實軸對稱圓形震波管進行程式驗證,計算結果與實驗數據相符。
本研究藉由改變砲口制退器的外型,達到控制砲口氣動力的功效,並將結果提供國軍未來對中間彈道計算及砲口制退器設計研發時的參考工具。
The purpose of this research is to develop the capability to investigate the intermediate ballistics of a cannon mounted with a muzzle brake. The flowfield to the concern of the intermediate ballistic is extremely complex. Many important issues are strongly related to this portion of the ballistic, e.g. the strength of the blast wave, the blast noise, the design of the recoil mechanism. Traditionally, these issues are investigated experimentally through the firing test. However, this kind of experiments are usually difficult, expensive and, sometimes, dangerous. That motivate the current project. Through the using of the computer simulation techniques (the Computational Fluid Dynamics), we could analyze the flowfield within the intermediate ballistic portion in advance of a real cannon is fabricated, a lot of trial and error process can be saved.
Hence, in this thesis, a numerical code with TVD upwind method for solving the Euler or Navier-Stokes equations has been developed to simulate this complex problem. In spatial discretization, the least artificial viscous Roe''s solver with high order kappa MUSCL interpolation is used. In temporal discretization, second order explicit Hancock method is employed for time integration.
Those methods couple with dynamic grid generation successfully simulate. Comparison the numerical results with experiment data, it assures that this code can be used as an effective design tool for this kind of problems. In this study, a computer code is established for the computation of this unsteady flowfield with the moving projectile. The code shall be validated wherever the experiment data are available. With the results of this project, the effects of different muzzle brake designs can be further investigated.
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