Air Blast Wave Attenuator Development.
Rept. for Jul 67-Jun 70,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A passive air shock wave attenuator has been proven effective--up to 80 shock front attenuation--over a variety of input conditions and a wide range of overpressures from 10 psi to 3000 psi. Pure viscous attenuation was studied by using square wave inputs. Peaked wave inputs, which attenuate more rapidly, but are more realistic simulations of nuclear blast waves were also studied. Normal airflow resistance was considered carefully since most passive devices are unduly restrictive. A tradeoff between acceptable normal flow resistance and blast wave attenuation, based upon experimental work and a limited facility requirement study, leads to a length to diameter ratio of 300 for most applications. Finally, attenuator configurations are proposed design were considered. A variety of configurations are proposed, the most promising of which, from a fabrication viewpoint, is a parallel plate arrangement. However, the potential of this configuration has not been confirmed experimentally. Author
- Structural Engineering and Building Technology