Design of a double-suction fan stage to improve efficiency by up to 4 points

Our client is one of the leading turbomachinery manufacturers. In this project, they asked ADT to perform a complete stage analysis of a double suction fan stage, then redesign the fan impeller using the inverse design code in TURBOdesign1 in order to improve the aerodynamic performance.

Streamline flow in double suction fan stage

Design Targets

The design and analysis of an existing double-suction fan stage including inlet ducts, connecting channels, impeller and volute, with the redesign of fan impeller for improved aerodynamic efficiency.


Redesign of the impeller geometry.


The stage efficiency was improved by up to 4 points.

A parametric study was performed using TURBOdesign1 in order to find the effects of the design parameters on the fan



The geometrical constraints were to reduce manufacturing costs and included a constant thickness (airfoil shape was not acceptable), straight filament blade geometry and low to moderate stacking shape. Stage analysis of the double-suction fan with the final redesigned impeller showed significant improvement in the efficiency (about 4 points at design point) and improved stall performance.


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Darshan Patel

Marketing Manager

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