水中平面冲击波对刚性方形台的绕射效应研究
发布时间：2018-07-27 17:52
【摘要】：采用LS-DYNA模拟了水中平面冲击波与刚性方形台的相互作用,分析得到方台正面和背面绕射波特性及其迹线。研究表明,水中冲击波的拐角绕射会在拐点处形成"涡流",在其邻近区域产生"零"压力场,从而出现"空化"效应,致使结构邻水面产生负压作用,这是结构产生破坏的一个重要成因。基于绕射效应模拟结果和水的高压状态方程导出的直方台背面绕射压力计算公式,适用于无自由水面影响且忽略水中结构变形时的绕射冲击波压力计算。这对结构背部绕射效应的理论分析具有指导作用。
[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.
【作者单位】： 解放军理工大学野战工程学院;
【基金】：爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201306)
【分类号】：O353.4
，
本文编号：2148679
[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.
【作者单位】： 解放军理工大学野战工程学院;
【基金】：爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201306)
【分类号】：O353.4
，
本文编号：2148679
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