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Design High Performance Centrifugal Compressor Vaned Diffusers

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.

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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.

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About Advanced Design Technology

We provide software and services for the design and optimization of turbomachinery, based on our unique 3D Inverse Design technology. Our tools and services help customers achieve innovative “breakthrough” designs, delivering market leading solutions at dramatically reduced development costs.

ADT, headquartered in London, UK, was established in 1999 as a joint venture between University College London and The Ebara Research Co Limited of Japan. We are considered as one of the leading global turbomachinery design software providers, with our TURBOdesign Suite tool set in use across a very wide range of applications and sectors. 

Our design consultancy services deliver cutting-edge solutions to our global customers. Whether the task involves a complete solution, from concept to final design for manufacturing, or is facing challenging multi-point / multi-objective design optimization, we work closely with our customers and support them throughout the entire design process.

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