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Evolution of blast wave profiles in simulated air blasts: experiment and computational modeling

Content Provider	Springer Nature Link
Author	Chandra, N. Ganpule, S. Kleinschmit, N. N. Feng, R. Holmberg, A. D. Sundaramurthy, A. Selvan, V. Alai, A.
Copyright Year	2012
Abstract	Shock tubes have been extensively used in the study of blast traumatic brain injury due to increased incidence of blast-induced neurotrauma in Iraq and Afghanistan conflicts. One of the important aspects in these studies is how to best replicate the field conditions in the laboratory which relies on reproducing blast wave profiles. Evolution of the blast wave profiles along the length of the compression-driven air shock tube is studied using experiments and numerical simulations with emphasis on the shape and magnitude of pressure time profiles. In order to measure dynamic pressures of the blast, a series of sensors are mounted on a cylindrical specimen normal to the flow direction. Our results indicate that the blast wave loading is significantly different for locations inside and outside of the shock tube. Pressure profiles inside the shock tube follow the Friedlander waveform fairly well. Upon approaching exit of the shock tube, an expansion wave released from the shock tube edges significantly degrades the pressure profiles. For tests outside the shock tube, peak pressure and total impulse reduce drastically as we move away from the exit and majority of loading is in the form of subsonic jet wind. In addition, the planarity of the blast wave degrades as blast wave evolves three dimensionally. Numerical results visually and quantitatively confirm the presence of vortices, jet wind and three-dimensional expansion of the planar blast wave near the exit. Pressure profiles at 90° orientation show flow separation. When cylinder is placed inside, this flow separation is not sustained, but when placed outside the shock tube this flow separation is sustained which causes tensile loading on the sides of the cylinder. Friedlander waves formed due to field explosives in the intermediate-to far-field ranges are replicated in a narrow test region located deep inside the shock tube.
Starting Page	403
Ending Page	415
Page Count	13
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	22
Issue Number	5
e-ISSN	14322153
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Blast wave Shock tube Pressure profiles Expansion Jet wind Experiments Numerical simulations TBI Thermodynamics Engineering Fluid Dynamics Fluid- and Aerodynamics Engineering Thermodynamics, Heat and Mass Transfer Condensed Matter Physics Acoustics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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