Laser Velocimeter Measurement of the Chronological Velocity at Selected Positions in the Muzzle Blast from a 20-mm Cannon

Abstract : A real fringe laser velocimeter was used to obtain one dimensional chronological velocity measurements in the muzzle blast from a 20-mm cannon at selected centerline and barrel edge positions. Although data acquisition was slow allowing no more than 22 measurements per millisecond, the data show discernable flow features such as shock waves and mean flow velocities before and after passage of the projectile. The data clearly demonstrate the ability of real fringe laser velocimeter systems to obtain data in flow fields of this type.