Fan Simulation Problem

engineerm · June 26, 2020, 07:45

Hello guys,

I have a problem about fan simulation with MRF-frame motion at steady state on fluent.

I want to compare the techical data and CFD results.

The power of the fan motor is 250 Watt and there is to be some power loss due to mechanical components, electricity tranforming and heat. The revolution per miute of the fan is 1380 rpm.

I analyzed the fan in fluent. From the results, I have read the mass flow rate, pressure change by reading the total pressure at the fan inlet area and at the fan outlet area. Finally, I have calculated the power with Power=mdotxDeltaPressure and obtained about 50 Watt. This calculated power seems very low when compared to thecnical data.

The velocity vector on a plane at the middle zone of fan is at the attachments and there are some reverse flow. It seems very strange to me. Are there any problem that you notice? Please inform me.

engineerm · June 26, 2020, 07:47

Actually I want to obtaine the power carried to the air. I suppose it should be 110 Watt but I calculated 50 Watt.

acalado · June 26, 2020, 09:27

Power should be volume flow x dP, not mass flow

engineerm · June 29, 2020, 04:19

Quote:

Originally Posted by acalado

Power should be volume flow x dP, not mass flow

Yes, you are right. I calculated the power converting mass flow to volume flow.

June 26, 2020, 09:27		#3
acalado Senior Member André Join Date: Mar 2016 Posts: 133 Rep Power: 10	Power should be volume flow x dP, not mass flow __________________ Sapere aude!

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June 26, 2020, 07:47		#2
engineerm New Member Mehmet Join Date: Feb 2019 Location: mhmt.ozden@yandex.com Posts: 23 Rep Power: 7	Actually I want to obtaine the power carried to the air. I suppose it should be 110 Watt but I calculated 50 Watt.