Conical Diffuser Calculation 1

[gr888]

Dear All,

Could anyone tell me if there are any metric tables or graphs describing pressure gains for air flowing in a pipe of increasing diameter (i.e. a conical diffuser) at various flow rates.

I'm concerned with small diameters - 10mm to 100mm.
And flow rates upto about 0.25kg/s

Further to that, what is the effect of a swirling air flow?

Failing that, can anyone point me in the direction of a way of calculating it accurately?

Thanks for any advice at all.

 

[JStephen]

Seems like my Fluids textbook had a chart of pressure recovery versus cone angle for diffusers. In non-dimensional form, equally applicable to metric or other. Based on incompressible flow, which might or might not be applicable to your case.

 

[gr888]

Thanks for the reply, that would be the sort of thing i'm looking for, but for a compressible flow.

 

[JStephen]

My compressible flow textbook has a several-page discussion of flows and shock waves and all in diffusers- apparently, it's not a simple topic. But no helpful charts or graphs.