Accession Number : ADP000266

Title :   The Blast-Noise Environment of Recoilless Rifles,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC)

Personal Author(s) : Gladstone,D. ; Plett,E. G.

Report Date : JUL 1981

Pagination or Media Count : 9

Abstract : The blast-noise environment of recoilless rifles is a complicated three-dimensional flowfield which must be understood before impulse noise levels in the operator's position can be reduced. Both breech blast (produced by a unsteady, underexpanded jet of hot propellant gas behind the weapon) and muzzle blast (produced by exit of gas both ahead of and behind the projectile) are important. A short survey of some of the experimental and numerical studies of both the breech blast and muzzle blast problems is presented here, followed by a description of the experimental approach used at DREV. Several of the pressure vs time profiles which were obtained are presented with the data for the operator's position appearing to indicate the occurrence of breech and muzzle blast interaction.

Descriptors :   *Blast, *Noise, *Recoilless guns, *Rifles, Three dimensional, Flow fields, Canada

Distribution Statement : APPROVED FOR PUBLIC RELEASE