Hi every body,
I need a trend for design a industrial ventilator, which works on in incomprehensible air flow.
I know that these steps should be considered:
1- Calculation of Y:
Y = g*H - H is the ventilator head
2- Calculation of specific velocity:
Ns = n*Q^0.5/H^0.75
3- Calculation of needed power of fan using:
PQ = rho*g*Q*H
4- Calculation of outer diameter of fan using:
D2 = 6/(pi*n)*(2*Y/sai)^0.5 ---> how can I find the sai??
5- I saw a relation for diameter ratio in CFTurbo tutorial as following:
D1/D2 = 1.25*(sai/etaV)^0.5*sigma^(5/6) ---> how can I find the sigma??
using the calculated sigma in CFTurbo, I obtained D1/D2 = 0.762, but the software obtained that 0.725.
In addition, I didn't find any relation for calculation of velocities.
Thanks
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