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水下爆炸气泡作用下梁中垂损伤及流场变化特性

DOI: 10.11858/gywlxb.2012.05.003, PP. 494-500

Keywords: 水下爆炸,气泡脉动,流场特性,损伤模式,自由梁

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Abstract:

以水面箱形梁模型为研究对象,利用数值计算和实验验证相结合的方法,对梁在水下爆炸气泡作用下的中垂损伤特点进行了研究,确定了中垂弯曲载荷的形成原因,深入分析了气泡运动时周围流场的变化特性;研究了爆炸参数对梁响应特性的影响,初步提出了梁发生中垂损伤的条件。研究发现:在爆炸气泡收缩阶段,结构和气泡之间的流场形成一个“凹”型分布的低压区,导致梁发生中垂弯曲变形;当爆径比参数λ满足1<λ<2.5时,爆炸气泡对梁结构的中垂损伤作用明显,且λ越小,等量炸药对梁的整体损伤作用越大。

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