Experimental Measurements of the Blast Pressure Profile for 20-mm Perforated Muzzle Brake Designs
Final rept. Aug 1990-Oct 1992
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Pressure measurements were recorded at the Weapons Technology Directorate WTD of the Army Research Laboratory to verify predictions of a blast model used at Benet Weapons Laboratory BWL. An array of 11 piezoelectric gages was placed in a vertical line perpendicular to the gun barrel and positioned at various locations behind the muzzle during the testing of 2 perforated muzzle brakes. The two muzzle brakes were designed and fabricated to fit on a 20-mm Mann barrel. The two brakes were compared to a third device which had no perforations and served as a baseline. The first muzzle brake was a scaled-down version of the EX35 and the second was a special design that had two rows of holes relocated between 7.5 and 9 calibers behind the muzzle ,split brake,. The pressure gage array was used to measure the portion of the blast profile that affected the area behind the gun. This test was performed in conjunction with the first phase of the test where far field pressure measurements and blast wave shadowgraphs were obtained. This report includes the characteristics of the blast pressure wave for each muzzle device, through pressure profile data and shadowgraphs, as it travels rearward along the gun axis. The results provide quantitative information for precise comparisons to the blast models predictions. 20-mm, Blast, Overpressure, Perforated, Muzzle brakes.