Investigation on the Blast Wave Structures of a High-speed Projectile Flying Through Different Muzzle Brakes.

The processes of a high-speed projectile flying away from the bores through different muzzle brakes were numerically simulated by using the high resolution Roe scheme and the structured dynamic mesh techniques based on the two-dimensional unsteady Euler equation. The calculated results describe the evolution process of muzzle blast wave structures of different muzzle brakes (without muzzle brake, a three-way muzzle brake and a multi-cavity muzzle brake), and the interaction and evolution processes of them and the projectile are visualized clearly in the computational schlieren images. The numerical results agree well with our previous corresponding experimental shadowgraphs. Moreover, the reducing mechanism of recoil impulse of muzzle brake and the distribution of overpressure areas around the muzzle were discussed in detail, which can praide important guidance for improving the muzzle brake design. [ABSTRACT FROM AUTHOR]