Creating Impeller blade
Creating Impeller blade
(OP)
Greetings everyone.
Does anybody tried making an impeller blade. Just want to know what's the best approach or command in UG on the swerling shape of the blade. I only have angle input on the 2d for the blade, I still figuring out how these angle be applied in UG to get the shape. I would be very grateful to somebody who can share their experty.
Thanks in advance guys.
lang, cge
Does anybody tried making an impeller blade. Just want to know what's the best approach or command in UG on the swerling shape of the blade. I only have angle input on the 2d for the blade, I still figuring out how these angle be applied in UG to get the shape. I would be very grateful to somebody who can share their experty.
Thanks in advance guys.
lang, cge





RE: Creating Impeller blade
I'm sure we've modelled a few but it is often the case that they don't contain a twist as it usually makes them exceedingly difficult to manufacture. Anyway a sweep with an angular law and linear function allows you to induce a twist about the guide curve as an axis by a set angle.
If you post your version of NX and some of the material or CAD files then we'd probably get closer to figuring an appropriate response.
Cheers
Hudson
RE: Creating Impeller blade
Once again, thank you so much.
Regards,
lang, cge
RE: Creating Impeller blade
Best regards
Simon (NX4.0.4.2 MP4 - TCEng 9.1.3.6.c)
www.jcb.com
Life shouldn't be measured by the number of breaths you take, but rather how many times it's taken away...
RE: Creating Impeller blade
thanks for sharing; that's a cool part.
RE: Creating Impeller blade
Just out of curiosity: I think the 2D blade chape normally is a volute, but how do you determine the angle of the blade (from a geometric point of view, not a UG modeling point of view)?
regs,
Gieter,
RE: Creating Impeller blade
Al
RE: Creating Impeller blade
RE: Creating Impeller blade
Cheers
Hudson
RE: Creating Impeller blade
Or, by analyzing the faces using the reflection option (you can pic from a variety of pictures to use as the reflection).
RE: Creating Impeller blade
For your information, the reflection mapping is more of an industrial design tool for people who model class A surfaces such as car body panels. It anables the designer to identify irregularities in the surfaces, such as non-tangency or inflections as these will distort the light and show them up very easily.
For us non felt-tip fairy type design engineers, the reflection mapping is a nice way to get some decent looking images for presentations etc. ;)
Best regards
Simon (NX4.0.4.2 MP4 - TCEng 9.1.3.6.c)
www.jcb.com
Life shouldn't be measured by the number of breaths you take, but rather how many times it's taken away...
RE: Creating Impeller blade
Al
RE: Creating Impeller blade
They obey to very strict fluid-dynamics laws and generally end up with double-curvature shapes. The design parameters, however, are leading-edge angles and trailing-edge angles, plus various other such as angular span etc...
There is no simple way to model such a blade with a CAD, in the case you want to keep the design parameters "as they are". Most of the time appropriate routines generate points-clouds, very seldom the parametric model uses the exact same parameters used in the calculation / design of the blade profile.
With Pro/Engineer, something like 10 years ago, I found a way to do this.
With UG, this seems far more difficult though various workarounds DO exist (where I work, a particular method is used but it is obviously top secret !).
For my own pleasure, I made a model of a Francis turbine using the parametric definitions of Hermite curves. Thanks to this, the "piloting" parameters are exactly the ones an hydraulic engineer uses when he defines the blade. But the math underlying is a bit complicated... I described it in an old thread dated 2005 or so... I even can't remember the exact title.
Sorry for not being more precise,
Regards
RE: Creating Impeller blade
GE and others have created in-house functions as well to do these things. We machine turbine products and I can tell you every customer has there own way of doing things. Most come to us as ugly patches. Very few actually model the variable fillets at the hub area properly.
--
Bill
RE: Creating Impeller blade
Once again thanks.
Lang, cge