Monday  |  Salon 13  |  10:20 AM–10:40 AM

#16096, Efficient Mitigation of Implosion Pressure Pulses Using Shrouds

The effects of shrouds on the pressure signatures emitted by the implosion of thin metallic cylindrical shells were experimentally investigated. Thin-walled metallic shrouds with several small perforations were placed concentric to a sealed implodable volume which was brought to instability hydrostatically within a pressure vessel simulating a free-field environment. High speed stereo photography coupled with the 3D digital image correlation (DIC) technique provided full-field displacement histories of the shroud during the event. High frequency response dynamic pressure transducers placed at several locations around the shroud captured emitted pressure histories. The effects of shroud perforation orientation and surface density were investigated. When compared to an un-shrouded baseline implosion, attenuation of the emitted pressure signatures of up to 90.8% for the overpressure pulse and 68.1% for the peak suction pressure was achieved. Strong interaction between the shroud and implodable was observed, with the duration between instability onset and wall contact increased by 18.3%. Research is ongoing to understand the physics of fluid-structure interaction between an imploding volume and a deformable confining shroud.


¹ Dynamic Photomechanics Laboratory, Department of Mechanical, Industrial and Systems Engineering, University
of Rhode Island, Kingston, RI, 02881, USA
² Naval Undersea Warfare Center (Division Newport), 1176 Howell St, Newport, RI, 02841, USA

DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited.

Victoria Reilly   University of Rhode Island
Dillon Fontaine   Naval Undersea Warfare Center (Division Newport)
Arun Shukla   University of Rhode Island