CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Radial Fan Outlet measurements

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   August 1, 2002, 10:54
Default Radial Fan Outlet measurements
Posts: n/a
Hi Forum,

I have done some initial tests to establish inlet conditions for a CFD analysis. The objective is to predict electronic and optics cooling. However when I perform velocity measurements at the outlet of the fan house, about 1/4 of fan outlet area have 'negative velocities' - which appears to be a constant recirculation. My question to the forum is (if anybody have worked with radial blowers for similar applications), does this kind of behaviour arise from a bad design or is this to be expected of any radial blower fan.

I am willing to disclose the measurements and give further details, if anyone wants to discuss this further.

  Reply With Quote

Old   August 1, 2002, 11:32
Default Re: Radial Fan Outlet measurements
Erich F.
Posts: n/a
My guess would be that if you are at 'design' flow then there is room for improvement in the housing. Otherwise, I would expect it to be somewhat typical depending on the geometry, etc. Areas of interest definitely being the wheel, cutoff, and the housing...
  Reply With Quote

Old   August 2, 2002, 03:36
Default Re: Radial Fan Outlet measurements
Posts: n/a
Hi Erich,

Thanks for your quick response. I am running the fan at the design point, so I will try to get some samples from other manufacturer to compare the measurements and pick the best solution.

Your comments are really appreciated.

  Reply With Quote

Old   August 5, 2002, 05:12
Default Re: Radial Fan Outlet measurements
jan rusĺs
Posts: n/a
I think it is standard for radial fans that there exist a region with reversed flow. I once had to look at the flow distribution in a duct system where the flow was from a radial fan. In the data from the fan there was a sketch of the flow distribution out of the fan where a recirculation zone was clearly seen. I did try to get some measurement, but either they were not available or I could not get them. But I was told that they would expect 1/3 or the section to be reversed flow and in the region with maximum velocity, would the peak velocity be around 2*mean. Have you looked into the housing is there niót an obstruction in the region with reversed flow? I do not know if this helps, but your results sounds familiar

  Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
radial fan model bc's seza FLUENT 2 December 27, 2013 04:52
Setting Pressure outlet boundary for simulation of Radial impeller Mukund Pondkule Main CFD Forum 1 April 5, 2011 09:24
radial fan model fidan FLUENT 3 March 6, 2008 21:42
Radial fan problem : Attn Razvan and all Farhath FLUENT 0 September 26, 2007 04:18
CFD v Experiment for Radial Fan Alan Davis Main CFD Forum 7 April 24, 2001 12:15

All times are GMT -4. The time now is 14:44.