Sound Generation from Fluid Flow

[klippen88]

Hi guys,

I am involved in some research on modelling sound from fluids through mirco annuli and i have been trying to get some of the basic fundamentals on generation of sounds from turbulent flow. Unfortunately most of the online literature do not give much details on the physics of such mechanism.

I hope you guys could provide me with some principels:

From my understanding, turbulence generate sound due to vortex shedding and micro vortices which generates pressure fluctuation within the fluid (i am not sure if this is correct) - these will transmittet through the structure and be recorded by the reciver on the other side of the annuli. (my model is a cement cylindre with a mirco annuli in the centre, where we throttle fluid across the cylindre - receiver is placed on the outside of the cylindre in liquid)

However, our case is to modelling the noise which is generated as the fluid is accelerated through the micro annuli.Thank you all so much for you help!

 

[Baluncore]

Is the fluid an incompressible liquid, or a compressible gas?
Is the fluid pure, or are there lumps in the fluid that will change the flow rate?

Fluid-Structure Interactions In Acoustics -1999- Edited By Dominique Habault. Springer-Verlag Wein.

Oscillations and Waves in Linear and Nonlinear Systems -2012- MI Rabinovich, DI Trubetskov. Kluwer Academic Publishers.

 

[klippen88]

Is the fluid an incompressible liquid, or a compressible gas?
Is the fluid pure, or are there lumps in the fluid that will change the flow rate?

I am sorry for not stressing this issue in my previous thread!

Both! I.e., I will model a case with incompressible liquid (oil) and one case with compressible fluid (gas).

Pure fluid with an decrease in the "leak" rate, in this manner you could considere the system as a system with overpressure which is bleed of to allow migration of the fluid through the micro annulus.

Hope this helps!

 

[Baluncore]

OK. See also; Acoustics of Fluid-Structure Interactions -1998- MS Howe, Cambridge Monographs on Mechanics, ISBN 0521633206, 9780521633208

 

[klippen88]

Thank you! :-)