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

作　　者：Edward Chern Jinn Gan Alex Remennikov David Ritzel 

机构地区：[1]Faculty of Engineering and Information Sciences,University of Wollongong,Wollongong,NSW,2522,Australia [2]Dyn-FX Consulting Ltd,19 Laird Ave North,Amherstburg,ON,N9V 2T5,Canada

出　　处：《Defence Technology（防务技术）》2024年第7期14-26,共13页Defence Technology

基　　金：funded partially by the Australian Government through the Australian Research Council’s Linkage Infrastructure,Equipment and Facilities (LIEF)funding scheme (LE130100133)。

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.

关 键 词：Advanced blast simulator Shock wave propagation Far-field explosion Blast loads Blast waves Computational fluid dynamics 

分 类 号：TJ06[兵器科学与技术—兵器发射理论与技术] X932[环境科学与工程—安全科学] TQ560.1[化学工程—炸药化工]