Vibrations due to pressure drop over orifice
Vibrations due to pressure drop over orifice
(OP)
Hello everybody!
Do any of you have any tips on how to calculate vibrations caused by pressuredrop over an orifice?
It now seems that higher backpressure leads to heavier vibrations.
The flow is also fluctuating, reprociating pump.
Any tips on litterature would also be welcome!
Cheers,
Sai
Do any of you have any tips on how to calculate vibrations caused by pressuredrop over an orifice?
It now seems that higher backpressure leads to heavier vibrations.
The flow is also fluctuating, reprociating pump.
Any tips on litterature would also be welcome!
Cheers,
Sai





RE: Vibrations due to pressure drop over orifice
RE: Vibrations due to pressure drop over orifice
This is an unstable oscillatory flow condition set up when flow is interrupted by a blunt unstreamlined body in the flow path. It is what causes flags to wave or flutter in a breeze.
The faster the flow, the higher the frequency created in the wake. Some commercial fluid flow meters operate on this principle.
http://en.wikipedia.org/wiki/Vortex_shedding
RE: Vibrations due to pressure drop over orifice
A trick you see sometimes is to add a small amount of air after the plate.
An orifice program should be able to calculate the noise (vibration) for you.
Roy
RE: Vibrations due to pressure drop over orifice
Do you have any good orifice programs to recommend Roy?
Br,
Sai
RE: Vibrations due to pressure drop over orifice
I just had a look at one suggested by Mark Hill. It looks OK
Click on the blue button "Start Calculator"
h
Faiing that most instrument suppliers have one for free e.g. Emmerson
Good Luck
Roy
RE: Vibrations due to pressure drop over orifice
Gonna check it out now!
Br,
Sai