|April 18, 2013, 06:48||
torque shatf & power shaft
Join Date: Jun 2011
Posts: 141Rep Power: 9
Im not an air fan expert and i`d like some tips. I have a fan modeled in a closed circuit which is somewhat being constricted past the fan, hence the pressure increaeses a little more. So the pressure difference is higher than the dynamic pressure only. Inlet is atmospheric. A mrf model of my fan alone in a environment, using MRF models, shows a mass flow rate of 12-13 kg/s of air at 2500 rpm. a second modeling, without MRF, but with boundary conditions simulating the flow from the fan (w/o swirling) an average surface pressure of 3400Pa results past the fan!
With some simple formulas i have:
shaft power as : massflowrate*deltaP 12.8*3425 = 43520W shaft torque as: shaft power/ 2*pi*N , where N = revolutions per sec 60*43520/2/3.1416/2500 = 166Nm
any comments are mostly welcome!
"Elune will grant us the strength"
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