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頁籤選單縮合
題 名 | 前機身安裝不同型式側板對渦流場之影響=The Effect of Vortex Flowfield of a Forebody with Various Type of Strakes |
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作 者 | 劉明山; 賈志文; | 書刊名 | 逢甲學報 |
卷 期 | 31 1997.06[民86.06] |
頁 次 | 頁129-138 |
分類號 | 447.553 |
關鍵詞 | 側板; 高攻角; 渦流; 水洞; Strake; High angle of attack; Vortex; Water tunnel; |
語 文 | 中文(Chinese) |
中文摘要 | 戰機前機身背風處之對稱渦流,會隨著戰機攻角增加至某一角度時開始轉變成不對 稱渦流,而此不對稱渦流衍生了巨大的側向力,導致戰機航向的偏離或提早進入螺旋,因此前 機身渦流流場對戰機高攻角操縱性具有決定性之影響。本試驗係利用水洞進行流場觀測,由試 驗結果得知,當機身細長比愈大,則不對稱渦流發生的啟始攻角愈小。在前機身加裝側板能使 不對稱性渦流轉變為對稱性渦流,並且可延遲渦流不對稱之發生。當側板安裝位置愈前方或側 板前端位置固定且後掠角愈小、長寬比愈大,則愈能延遲渦流不對稱發生之啟始攻角,並使得 前機身渦流崩潰位置愈前方。 |
英文摘要 | The vortex patterns of a forebody become asymmetric at high angle of attack. These asymmetric vortices produce a large side force that leads a fighter to yaw departure or spin. Thus, the forebody vortex flow field has decisive influence on maneuverability of a fighter at high angle of attack. This experiment was performed in the 60cm×60cm water tunnel to explore the vortex generation mechanism of the forebody and the forebody vortex control by strakes. From the experimental results, the forebody produces lower onset angle of attack as the fineness ratio increasing. The strakes on the forebody can delay the occurrence of asymmetric vortex at higher angle of attack. The larger of the slenderness ratio or the smaller the sweep angle of the strake and the more forward of the deployment position have the better ability to delay the asymmetric vertex. |
本系統中英文摘要資訊取自各篇刊載內容。