Controlling blast wave generation in a shock tube for biological applications

18th APS-SCCM; 24th AIRAPT

Nguyen, T.-T.N.^1 ; Wilgeroth, J.M.^1 ; Proud, W.G.^1

Royal British Legion Centre for Blast Injury Studies, Institute of Shock Physics, Imperial College London, United Kingdom^1

关键词: ANSYS software package;    Biological applications;    Biological specimens;    Breakage process;    Burst pressures;    Computational modelling;    Rupture process;    Scientific researches;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/14/142025/pdf
DOI  :  10.1088/1742-6596/500/14/142025

来源: IOP

【 摘 要 】

The shock tube is a versatile apparatus used in a wide range of scientific research fields. In this case, we are developing a system to use with biological specimens. The process of diaphragm rupture is closely linked to the shock wave generated. Experiments were performed on an air-driven shock tube with Mylar®and aluminium diaphragms of various thicknesses, to control the output. The evolution of shock pressure was measured and the diaphragm rupture process investigated. Single-diaphragm and double-diaphragm configurations were employed, as were open or closed tube configurations. The arrangement was designed to enable high-speed photography and pressure measurements. Overall, results are highly reproducible, and show that the double-diaphragm system enables a more controllable diaphragm burst pressure. The diaphragm burst pressure was linearly related to its thickness within the range studied. The observed relationship between the diaphragm burst pressure and the generated shock pressure presents a noticeable difference compared to the theoretical ideal gas description. Furthermore, the duration of the primary shock decreased proportionally with the length of the high-pressure charging volume. Computational modelling of the diaphragm breakage process was carried out using the ANSYS software package.