Axial fan blade

Hi folks,
did someone of you ever design an axial fan blade.
My problem is that i can only sweep alone a line, but
this does not help me in that special case.
The blade should get thinner towards the OD
and the stagger angle should get smaller.
I want to use an air foil profile from a data base in .iges
format.
Mit freundlichem Gruß / kind regards
Dr.-Ing. Haiko Adolf
Siemens AG
Deutschland

 

Do you mean that the section is progresively smaller (but with the same
proportions), and you add a torsion in the profile ??

If this is the case, probably you can make a blend (I can not remember but
there is an option for doing not parallel sections)

 

<snip>
: If this is the case, probably you can make a blend (I can not remember but
: there is an option for doing not parallel sections)
:
I agree with using a blend. Copy the iges section with 'use edge' for the first
blend section. Save this as a .sec file. Reuse this saved section for the second
section ('Sketch>Data from File'). It is placed with drag, scale and rotate
handles so that you can position it anyway you want. If you wish the trajectory
curved, do a smooth blend, three sections, placing them in relation to each other
to achieve a curved leading edge. I think this is what pitosYflautas referred to
when he mentioned the rotational blend (vs. the usual parallel blend) which can
also achieve the curved leading edge.

David Janes
:
:
: "Haiko Adolf" <> escribió en el mensaje
: : > Hi folks,
: > did someone of you ever design an axial fan blade.
: > My problem is that i can only sweep alone a line, but
: > this does not help me in that special case.
: > The blade should get thinner towards the OD
: > and the stagger angle should get smaller.
: > I want to use an air foil profile from a data base in .iges
: > format.
: > Mit freundlichem Gruß / kind regards
: > Dr.-Ing. Haiko Adolf
: > Siemens AG
: > Deutschland
: >
: >
:
:

 

Hello to all

Quite some time ago I designed a double curved axial fan blade for a fan of
an small home appliance. I used surfaces created from boundary curves (One
surface for convex party of the blade, second for concave part of blade and
one for closing the top at the outer dimension). With good referencing
(datums on the fly) I was able to do circular pattern.

This small fan is still in production (It's made from PA66 GF30).

And yes it was done in Pro/E version 17.

Good luck.

Barbarpapa1

 

Hi Haiko,

we used profiles calculated for several radii that we connected
afterwards using the blend function. In our case inlet and outlet angle
changed over the radius and I believe the center length ("Sehne") also
was not constant. The rotor looked quite funky (to us anyway) and that
particular design did not work ... but that was a design issue and not a
pro/e problem. The blend feature worked like a charme.
Tom