Impeller in Product Code Identification for Axial Rosenberg fans

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Fluid Flow Rules Of Operation For Fans

Speed variation at constant fan size and constant density :

The volume flow changes proportional to speed All pressures (static, dynamic and total) change square

of the speed

The power requirement changes cube to the speed

Changes in the density at constant speed (or change of the kelvin temperature at a constant flow medium):

The volume flow is not affected

All pressures change proportionately to the density *

The power requirement changes proportionately to the

Density

In the case of changes in the wheel diameter of geometrically similar wheels at constant speed:

The volume flow changes cube to the wheel diameter

All pressures (static, dynamic and total) change proportion to the square of the wheel diameter.

The power requirement changes proportionately to the fifth power of the wheel diameter

V1 / V2 = n1 / n2

p1/ p2 = ( n1 / n2 )2 = ( V1 / V2)2

p1/ p2 = ( n1 / n2 )3 = ( V1 / V2)3

V = const.

p1/ p2 = α1 / α2 = T2 / T1

P1/ P2 = α1 / α2 = T2 / T1

* T1 = To + t1 = 273.15 K + t1

T2 = To + t2 = 273.15 K + t2

V1/ V2 = ( D1 / D2 )3

p1/ p2 = ( D1 / D2)2

P1/ P2 = ( D1 / D2)5

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