Nozzle Design Questions

[Fredd3039]

This is a Muzzle Brake for a rifle barrel that uses rocket nozzle type porting that reduces felt recoil. The "Nozzles" are machined at a 30 deg slant towards the rear. The explosive pressure behind the bullet gets vented into the nozzles as the bullet passes them. The nozzle venting seriously dampens the recoil effect. I guess my question would be, Since this is drilled into a metal rifle barrel with a hollow core, the 30 deg angle reduces some of the throat volume or area, does this effect the function of the nozzle in a negative way? Oh I am an absolute beginner with Nozzle design so please go easy on me.
Thanks

 

[Baluncore]

Oh I am an absolute beginner with Nozzle design so please go easy on me.

Comments.

Drilling those diagonal nozzle holes will be difficult and expensive. The differences in machining and metallurgy, between a barrel and a brake, suggest it would be easier to make the brake separately, then attach it to the end of the barrel.

Very little gas will change direction, to escape backwards. I expect those small diameter holes will draw in more air, than they vent gas. There needs to be a reflector step internally to direct the propellent gas, backwards through the jets.

Better to have several axial discs with holes, like flat or conical washers. The projectile passes cleanly through the hole, while most of the gas pushes on the annulus, pulling the barrel forwards, countering the recoil. Gas that remains in the cavities between washers, may be released backwards through ports.

It is important that the operator not be blinded by the backward jets, and that dust is not raised from the ground when operating prone, that could make the operation dangerous to the operator.