Analysis of an existing double-suction fan stage including inlet ducts, connecting channels, impeller and volute and redesign of fan impeller for improved aerodynamic efficiency.
Redesigned impeller geometry.
The stage efficiency was improved 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 TURBOdesign1 in order to improve the aerodynamic performance.
The impeller and casing geometry of the existing double-suction fan was provided by our client. In the first part of the project ADT performed a complete CFD analysis of the fan stage in order to obtain a clear understanding of the flow field in the double-suction fan stage; including the suction ducts, fan impeller and exhaust volutes therefore identifying major sources of aerodynamic loss which could be improved in the redesign. A parametric study was performed using TURBOdesign1 in order to find the effects of the design parameters on the fan performance.