Accession Number : AD0785516

Title :   The Attainment of Recoilless Rifle Blast Reduction - A SEAS Status Report.

Descriptive Note : Technical rept.,


Personal Author(s) : Andrade,C. A. ; Spring,D. L.

Report Date : JUN 1974

Pagination or Media Count : 55

Abstract : Back blast overpressure measurements from firings of seventy 105mm RR inert rounds have been examined and compared to predictions by point source blast correlations and by time-dependent gas dynamic codes. The effect of porous shroud and parallel plate deflectors is shown for some full-scale tests. That of a sixty-staged, capacitative multinozzle, 1/7 subscale cluster, is shown to significantly reduce back blast. Some detonative properties of the incident blast wave are considered, and a thermochemical analysis is given for a dense (M-8) gas, performed under contract to obtain charged species and OH concentrations. It is concluded that capacitative-dissipative devices may be superior to the purely dissipative type of fluid mechanical blast attenuator, but that propellant and loading considerations play an important role in blast reduction. (Author)

Descriptors :   *Recoilless guns, Blast, Overpressure, Suppressors, Breech mechanisms, Flow fields, Gas flow

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE