【摘要】：采用LS-DYNA模擬了水中平面沖擊波與剛性方形臺的相互作用,分析得到方臺正面和背面繞射波特性及其跡線。研究表明,水中沖擊波的拐角繞射會在拐點處形成"渦流",在其鄰近區(qū)域產(chǎn)生"零"壓力場,從而出現(xiàn)"空化"效應,致使結構鄰水面產(chǎn)生負壓作用,這是結構產(chǎn)生破壞的一個重要成因�；诶@射效應模擬結果和水的高壓狀態(tài)方程導出的直方臺背面繞射壓力計算公式,適用于無自由水面影響且忽略水中結構變形時的繞射沖擊波壓力計算。這對結構背部繞射效應的理論分析具有指導作用。
[Abstract]:The interaction between plane shock wave in water and rigid square platform is simulated by LS-DYNA. The diffraction characteristics and trace lines of the front and back side of the square station are obtained by analyzing the interaction between the plane shock wave and the rigid square platform. The study shows that the corner diffraction of shock wave in water will form "eddy current" at the inflection point, and produce "zero" pressure field in its adjacent area, which will result in "cavitation" effect, resulting in negative pressure effect on the adjacent water surface of the structure. This is an important cause of structural damage. Based on the simulation results of diffraction effect and the high pressure equation of state of water, the calculation formula of diffraction pressure on the back of the straight square platform is derived, which is suitable for the calculation of the diffraction shock wave pressure without the influence of free water surface and neglecting the deformation of water structure. This can guide the theoretical analysis of the diffraction effect on the back of the structure.
【作者單位】： 解放軍理工大學野戰(zhàn)工程學院;
【基金】：爆炸沖擊防災減災國家重點實驗室開放課題(DPMEIKF201306)
【分類號】：O353.4
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本文編號：2148679