how to define the K-value for the connection between a pipe and sphere bottle

[jichai]

Hi all, I tried to model the connection between a pipe and sphere bottle in a Recip compressor package, but don't know how to define the k-value for this fitting?
Can anyone give some hints? Thanks

 

[GregLocock]

This sounds a bit like a Helmoltz resonator, but frankly there isn't much to go on. Are you sure acoustics is the right forum?

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[hacksaw]

Are you referring to the flexibility of the bottle connection or the accoustic resonance condition?

 

[jichai]

Hi hacksaw, thanks for the reply. yes, the sphere bottle is used for pulsation control, and I am trying to model the connection between the bottle and the pipes. No idea how much the K value I should define for it.

 

[jichai]

Hi GregLocock, thanks for the reply, and where should I go for the acoustics questions?

 

[GregLocock]

Good, we've established that it's acoustic and it sounds as if you are talking about a Helmholtz resonator.

In the normal equation k is the stiffness of the gas spring (the big volume) and m is the mass of the slug of air in the neck.

Wiki is your friend.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[btrueblood]

Or are you referring to the loss coefficient for the fitting?