查詢結果分析
來源資料
頁籤選單縮合
題 名 | 軸對稱砲口制退器對中間彈道影響之數值研究=Numerical Investigation of the Effects for the Muzzle Brake to the Intermediate Ballistics |
---|---|
作 者 | 戴昌賢; 尹昌榮; 江大成; 羅四維; | 書刊名 | 火藥技術 |
卷 期 | 14:1 1998.03[民87.03] |
頁 次 | 頁11-25 |
分類號 | 595.94 |
關鍵詞 | 砲口制退器; 爆震波; 筒狀震波; 馬赫盤; 中間彈道; Muzzle brake; Blast wave; Barrel shock; TVD upwind method; |
語 文 | 中文(Chinese) |
中文摘要 | 砲口制退器是裝配於砲管前端,於砲彈發射時用以分配導向爆炸氣燄的有孔管狀 裝置,於不改變現有火砲系統的架構下,可減輕後座機構的重量、進而降低後座力,增加火 砲穩定度; 由於火砲發射實驗量測的高度困難, 本文的主要目的即以計算流體力學 (CFD) 方法,探討砲彈在通過砲口制退器時,所衍生的氣動力問題。在數值方法上使用網格平均有 限體積法, 於空間通量的計算上, 則採 MUSCL 型式的 Roe's 上風法, 解非定常無黏性 Euler 方程組,並與一真實軸對稱圓形震波管實驗進行程式驗證。程式中配合動態格點方法 ,計算火砲擊發後,砲彈與管壁間的相對運動。文中並討論改變砲口制退器的外形,對砲口 氣動力特性之影響及彈丸乍出砲口,砲口燄與砲口制退器相互作用關係等中間彈道的問題, 作為對中間彈道計算及砲口制退器設計研發時的參考工具。 |
英文摘要 | The purpose of this researhc is to develop the capability to investigate the intermediate ballistic 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 simulated. 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. |
本系統中英文摘要資訊取自各篇刊載內容。