![]() The rapidity of such expansion produces an undesirable blast effect which is even further intensified by the forwardly moving rare-faction wave returning from the breech end of the gun tube. ![]() ![]() However, once such jet emerges from the forward end of the muzzle brake, the resulting pressure drop in the shock bottle area triggers a sudden collapse thereof which frees the shock waves for an extremely rapid expansion thereof in all directions. The area of high turbulency, commonly termed "a shock bottle" due to the particular shape of its boundaries, tends to assume a relatively steady state during the passage therethrough of the high pressure jet of discharge gases. At the same time, the rapid emergence of the hot jet of gas from the muzzle end of the gun tube produces a rarefaction wave which travels down the bore of the gun tube and is reflected from the closed breech to return to the muzzle end of the tube. ![]() The expansion of these gases proceeds with such rapidity that the resulting shock waves overtake the similar but relatively slower waves formed by the forward travel of the projectile and produce an extremely turbulent concentration of shock waves within the interior of the muzzle brake. Various studies of the blast effect produced by existing muzzle brakes have shown that it is initiated by the extremely rapid expansion of the jet of hot, high pressure gases exiting from the muzzle end of the gun tube immediately following the emergence therefrom of the projectile. However, in order to minimize the hazardous blast effect on the personnel in the vicinity of the breech end of the gun, muzzle brakes are generally designed to function at a small fraction of their maximum efficiency. In those guns which utilize muzzle brakes to reduce the recoil forces produced during firing, the efficiency of the braking action is largely dependent on the angle at which the discharge gases exiting from the muzzle end of the gun tube are deflected to the rear. This invention relates to muzzle brakes for guns and is more particularly directed to a brake for a large caliber gun capable of substantially reducing the blast effect usually transmitted to the breech end of the gun without necessitating a corresponding reduction in the efficiency of the braking action imparted thereto. The invention defined in claim 4 including means for adjusting the position of said nozzle relative to said baffle plate comprising, The invention defined in claim 4 wherein the exterior contour of said baffle plate is shaped to limit the deflecting surface thereof to the areas against which the flow of the discharge gases is directed by the configuration of the openings between said first pair of bars.ħ. The invention defined in claim 4 wherein said second pair of bars are shorter and spaced apart to a lesser extent than said first pair of bars.Ħ. In a muzzle brake secured to a gun tube for reducing the recoil forces produced during the firing of the gun, means for controlling the discharge of gases from the muzzle brake comprising,ĥ. The muzzle brake of claim 1 wherein the circumference of said baffle plate is coextensive with the opening in the forward end of said nozzle.Ĥ. The muzzle brake of claim 1 including means for adjustably locking said nozzle to said cylindrical end portion.ģ. A muzzle brake for reducing the recoil forces imparted to a gun during the firing thereof, comprising,Ģ.
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