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摘要: 采用冲击波物理中的阻抗匹配镜像线方法处理物质交界面,利用无网格光滑粒子流体动力学法 (smoothedparticlehydrodynamics,SPH)方法模拟沉底装药的水下爆炸过程,得到了不同方向不同爆距处的 峰值压力反射系数,分析了爆炸流场参量分布和变化规律,研究了不同水底砂层厚度和不同装药量对爆炸冲 击波传播和流场中压力的影响。结果表明:海底反射系数随测点与水平线夹角的变化而变化,当测点与水平 线夹角为约55时反射系数最大,其最大值可达1.5。本文的研究可为沉底水雷爆炸载荷的确定提供参考。Abstract: Theunderwaterexplosionprocessofmineslyingonseabedwassimulatedbyusingthe meshfreeSPH method.Andthesubstanceinterfacesweretreatedbyadoptingtheimpedancematching method.Thereflectioncoefficientsofthepeakpressuresindifferentdirectionsatdifferentdistances fromtheexplosioncenterwereobtained.Thedistributionandchangeoftheexplosionfieldparameters wereanalyzed.Andtheeffectsofdifferentsandthicknessanddifferentchargemassonshockwave propagationandpressurewerediscussed.Simulationresultsshowthattheseabedreflectioncoefficient varieswiththeanglebetweenmeasuringpointsandhorizontallineanditarrivesatthemaximumvalueof1.5whentheangleisabout55degree. Itishelpfulfordeterminingtheexplosionloadofmines lyingonseabed.
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