Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


design solution needed

design solution needed

design solution needed

What curve of a centrfugal impeller vane will produce the greatest exit velocity for incompressible fluids? If the design constraint limits the vane's surface to be parallel with the rotational axis, this will produce one result. If however the width of the vane also tapers radially, other solutions are possible! Curvature in three dimensions, or a helical pitch is also a consideration.
The application will be for a device within which liquid circulates as in a liquid ring compressor - but for a different purpose.

RE: design solution needed

Greatest velocity is produced by forward curved impellers.

RE: design solution needed

Thanks, I knew that "insideman".
    Not being skilled in the art, I'm looking for an idealized optimal solution mathematically described.
I know this is a horrific problem in fluid dynamics,
but surely something close to an answer must have been

RE: design solution needed

Hydraulic design in part computer and part witchcraft - most pump companies have a few specialist who just design what you're looking for. Since each application is different it is a case by case exercise.

Velocity is really a function of impeller tip speed determined by diameter and rpm. The amount of Energy (ie head) transmitted into the fluid is determined by the vane length and shape. Twisted vanes usually have more surface (length) than straight, radial vanes thus imparting more energy into the working fluid.

Now if you could explain all those electrical mysteries to me......

Keep the wheels on the ground

RE: design solution needed

Thanks so much "sprintcar"
That does confirm my suspicion that impeller design remains
an open question. I continue to research sources in the public domain gleaned from other threads in this forum.

Electric mysteries are not much better. There is still much
debate about which model of electromagnetism is more correct
i.e. Biot-Savart, Lorentz, Grassmann, or Ampere, Weber.
Maxwell and others not withstanding.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close