Smooth diversion and side wall pressurization characteristics of curved side holes in muzzle brake
To address the current issue of low recoil reduction efficiency in muzzle brakes,a design proposal is introduced that incorporates U-shaped curved side ports within the brake.This design aims to smoothly guide the propellant gas flow towards the rear side,thereby significantly reducing the recoil impulse by increasing the pressure on the curved port sidewalls and prolonging the effect of the high-pressure gas.Using a 30 mm aircraft cannon muzzle brake as a case study,and taking the internal gas flow state at the moment the projectile reaches the muzzle as the initial condition,a calculation method involving polyhedral meshing for stationary regions and hexahedral meshing for dynamic regions is employed.A comparison is made between the U-shaped curved side port brake and the straight-slanted side port brake,analyzing the gas flow characteristics and pressure distribution within the brake and side ports when the projectile passes through the curved side port.Results show that,compared to the straight-slanted side port,the U-shaped curved side port more smoothly introduces high-pressure propellant gas into the muzzle and increases the exit velocity to 2 500 m/s.The maximum recoil force of the curved side port is 11.8%higher than that of the slanted side port,as the curved port sidewall provides increased and more uniform pressure distribution,and extends the duration of high-pressure gas action,thereby improving the recoil reduction by 10.8%.
intermediate trajectorymuzzle brakecurved side holedynamic meshthree-dimensional flow fieldbraking force
万方数据
维普
