Blast waveform tailoring using controlled venting in blast simulators and shock tubes

超压 冲击波 冲击管 波形 爆炸物 脉冲(物理) 冲击波 休克(循环) 计算机模拟 工程类 空气冲击 航程(航空) 结构工程 计算机科学 模拟 航空航天工程 物理 医学 雷达 化学 采矿工程 有机化学 量子力学 内科学 热力学
作者
Edward Chern Jinn Gan,Alex Remennikov,David V. Ritzel
出处
期刊:Defence Technology [Elsevier BV]
被引量:1
标识
DOI:10.1016/j.dt.2023.11.026
摘要

A critical challenge of any blast simulation facility is in producing the widest possible pressure-impulse range for matching against equivalent high-explosive events. Shock tubes and blast simulators are often constrained with the lack of effective ways to control blast wave profiles and as a result have a limited performance range. Some wave shaping techniques employed in some facilities are reviewed but often necessitate extensive geometric modifications, inadvertently cause flow anomalies, and/or are only applicable under very specific configurations. This paper investigates controlled venting as an expedient way for waveforms to be tuned without requiring extensive modifications to the driver or existing geometry and could be widely applied by existing and future blast simulation and shock tube facilities. The use of controlled venting is demonstrated experimentally using the Advanced Blast Simulator (shock tube) at the Australian National Facility of Physical Blast Simulation and via numerical flow simulations with Computational Fluid Dynamics. Controlled venting is determined as an effective method for mitigating the impact of re-reflected waves within the blast simulator. This control method also allows for the adjustment of parameters such as tuning the peak overpressure, the positive phase duration, and modifying the magnitude of the negative phase and the secondary shock of the blast waves. This paper is concluded with an illustration of the potential expanded performance range of the Australian blast simulation facility when controlled venting for blast waveform tailoring as presented in this paper is applied.
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