CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > CFD News and Announcements > Message Display

CFD News and Announcements - Message DisplayCFD-Wiki

Post Response | Return to Index | Read Prev Msg | Read Next Msg

Design High Performance Centrifugal Compressor Vaned Diffusers

Posted By: Darshan Patel
Date:Sat, 3 Jun 2017, 2:05 p.m.

The design of the vaned diffuser of a centrifugal compressor is still based on a considerable amount of empiricism in its design methodology. Parameters such as area ratio and blockage, which are more relevant to conical diffusers, are used in conventional design practice.

vane.jpg

The particle paths predicted by a 3D CFD code for a conventionally designed vaned diffuser are presented. The particles are colour coded depending on their point of origin, varying from blue at the hub to red at the tip as shown by the legend. The particle paths indicate a complicated 3D flow pattern in the diffuser, and in particular the presence of a corner separation at the hub. This is due to the accumulation of low momentum fluid at the hub pressure surface corner, which then undergoes a strong positive pressure gradient. In order to improve the pressure recovery in the diffuser, TURBOdesign1 was used to re-design the vanes using the loading distribution.

The flow leaving the (conventionally designed) impeller is non-uniform with a high velocity at the hub and a low (almost stagnant) velocity near the shroud wall. In the TURBOdesign1, predicted particle paths for the conventionally designed impeller.

The predicted particle paths for the impeller designed by TURBOdesign1 redesign, a fore-loaded distribution is used at the hub to increase diffusion, and aft-loading at the shroud is employed to avoid any flow separation. Download the publication to read in full.

Download the full application publication > http://blog.adtechnology.co.uk/design-high-performance-centrifugal-compressor-vaned-diffusers

http://blog.adtechnology.co.uk/design-high-performance-centrifugal-compressor-vaned-diffusers


Post Response

Your Name:
Your Email Address:
Subject:
Message:
If you'd like to include a link to another page with your message,
please provide both the URL address and the title of the page:
Optional Link URL:
Optional Link Title:
If you'd like to include an image (picture) with your message,
please provide the URL address of the image file:
Optional Image URL:
If you'd like email notification of responses, please check this box:
 
Post Response | Return to Index | Read Prev Msg | Read Next Msg
Go to top Go to top
CFD-Wiki