I would like to learn how to calcul

[Kifkhitam]

I would like to learn how to calculate the back pressure in an industrial grade cylindrical silencer with one baffle.

 

[JStephen]

That sounds like the kind of information you'd get from the manufacturer of said item.

 

[IRstuff]

I think that a silencer is not something that's calculable by hand, and probable requires CFD to come close. Even then, it's possible that there's only empirical results

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[MrBTU]

It may be possible to get pretty close by hand, using velocity heads. See

https://www.chemicalprocessing.com/articles/2012/get-your-head-around-velocity-head/