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題名 | 平底體衝擊水面之壓力變化特性=Pressure Variation Characteristics of Flat-Bottom for Water Impact |
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作者姓名(中文) | 林銘崇; 謝立德; | 書刊名 | 力學 |
卷期 | 12:4 1996.12[民85.12] |
頁次 | 頁447-456 |
分類號 | 332.65 |
關鍵詞 | 平底體; 水面衝擊; 同步量測系統; Flat-bottom; Water impact; Simultaneous measurement system; |
語文 | 中文(Chinese) |
中文摘要 | 本文利用高速電子藕合攝影機之資料記錄與傳輸特性,建立一套與力學量測系統 同步之量測裝置,藉由光感測器觸發,獲得衝擊瞬間之壓力與液面變化過程。實驗結果顯示 平底體觸及水面後, 邊緣形成氣泡向外散溢, 平底體中央仍維持相當之空氣層,甚為接近 Ng & Kot ( 1991 )之數值模擬結果。 本文更以考慮空氣層等溫壓縮之附加質量理論,導 出壓力振盪頻率與氣墊厚度之間的關係,在實驗中作詳細的討論。 |
英文摘要 | This study utilizes the characteristics of data transport of a high speed charge coupled device (CCD) camera for the data acquisition system to simultaneously measure the pressure and flow field. The measurement system can be triggered by an external optical sensor, and obtain the free surface and pressure variation in each time step of the initial stage for water impact. Experimental results indicate that, at impact, the free water surface makes contact at the outer edge of the flat-bottom with air trapped beneath the body. The current results are almost as efficient as Ng and Kot's numerical calculations. In addition, the relationship between pressure oscillation frequency and the air layer thickness is derived by using added mass theory, under the assumption that air compression is isothermal. A detailed discussion of the experiment results is also made. |
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