Help with fan test setup 1

[JakeMontag]

So I am hoping this is the right forum to post this in but i have a question regarding the set up for a test series I want to conduct on a number of different fan models.

I am interested in conducting acoustic testing for a number of different fan models at a constant cfm rate and at different sp (inH2O) values in order to find a maximum acoustic signature at each data point.

For example: I want to test a fan at 250 cfm and then scale the SP rise from say 2.0" to 3.5" (by 0.1" increments) using an airflow damper upstream of the fan as well as varying the fan speed in order to find the noise level at each SP value.

My question is: Is there a way to analytically determine the SP stall value for the fan at a given cfm before testing so that I can narrow the range of values of SP i am testing in? I have the fan curve provided by the manufacturer but I am not sure how to best utilize it for this scenario and i would like to justify the results to myself as well.

Thanks in advance for any help!

 

[ione]

Rely on fan performance curve. Establish your system curve and find the working point of the fan. Try to build your system curve attentively to be sure you will operate your fan in a region far from the stall region indicated on the fan performance curve. With axial fans, which I tend to think is your case due to low static pressure involved, even small changes in the system curve can lead to big changes in flow rate.

 

[ione]

Jake,

The file in the attachment can give you further insights