Effects of Size of Venting Holes on the Characteristics of Quasi-Static Overpressure in Confined Space
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摘要: 约束空间爆炸载荷主要包含瞬态冲击波和持续时间较长的准静态超压,为了研究泄压口大小对约束空间爆炸准静态超压载荷的影响规律,采用三阶WENO有限差分格式,编写了约束空间内炸药爆炸冲击波三维数值计算程序。利用Sod激波管、双爆轰波碰撞、激波与熵波相互作用等经典算例验证了数值程序的可靠性。基于验证的程序开展了带有泄压口的约束空间内爆炸载荷数值计算。在分析数值计算结果基础上,提出了描述准静态超压载荷简化理论公式,该理论公式与数值计算结果吻合较好。研究结果可为工程抗爆结构设计提供一定的参考和指导。Abstract: The blast load generated by energetic materials in a confined space consists mainly of transient shock waves and the long-lasting quasi-static overpressure.In order to investigate the effects of the size of venting holes on the characteristics of the quasi-static overpressure in a confined space, a 3D high resolution hydro-code was developed in the present work implementing the third-order WENO scheme based on the FORTRAN platform.First, the problems of the Sod shock tube, the interacting blast wave and the shock entropy wave interaction were simulated to validate the code.Then, the validated code was used to simulate the blast waves generated by condensed explosives in a confined space.A simplified analytical model was proposed to describe the quasi-static overpressure, which agreed well with the simulation results.The research done in this paper can be used to provide reliable input load for the design of anti-explosion engineering structures.
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表 1 -b与S/V2/3数据
Table 1. Data of -b and S/V2/3
-b S/V2/3 0.0 0.0 6.797 1 0.005 8 21.145 0 0.023 3 68.604 0 0.093 2 238.389 3 0.372 7 -
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