The Gasdynamics of Perforated Muzzle Brakes
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
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In a study of perforated muzzle brakes, Nagamatsu, Choi, Duffy, and Carofano calculated the three-dimensional steady flow of a perfect gas through one vent hole and used the results to predict overall brake performance. The importance of the gas covolume is considered here by using the Abel equation of state. The brake performance calculations in the above study were limited to sets of holes of a single diameter. The merit of using sets of varying diameters is explored with particular emphasis on enhancing the structural integrity of the brake. In studies of conventional muzzle brakes, the gasdynamic efficiency, beta, has been found useful for comparing various brake designs and for scaling. A simple formula is presented which represents the efficiency of a wide variety of axisymmetric perforated brakes.