Design, construction and performance evaluation of a variable pitch axial flow pump

Canbaz, Özgür
The need for high capacity pumps is increasing in Türkiye. Meeting these type of demands with our national industry will become an important development for the future. In this thesis, a variable pitch axial flow pump, having capacity in the range of 500-700 l/s with the head in the range of 4.2-4.8 m at the rotational speed of 1000 rpm is designed, manufactured and tested in Layne Bowler Pumps Company. This thesis is a part of a work of TÜBİTAK-TEYDEB project. A design procedure is developed and impeller blades are designed by using the special airfoils. Pump geometry is constructed as variable pitch blades which provides a large operational range by changing the stagger angle of the blades. After the design calculations of the pump, the CFD (Computational Fluid Dynamics) analyses are performed. CFD is a valuable tool to predict the performance characteristics of the pumps with an easy and economical way. CFD is tried to be integrated into the design procedure and the improvement studies are performed. The experimental and the numerical results of the manufactured pump are compared to calibrate the CFD code to use for the future works. Also, the partload and the cavitation characteristics of the axial flow pumps are investigated. The cavitation performance, including the NPSHR and the cavitation inception of the designed axial flow pump is obtained with the help of CFD. The instability problems that are inevitable for axial flow pumps, which are caused by the presence of recirculation and secondary flows, are studied.


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Citation Formats
Ö. Canbaz, “Design, construction and performance evaluation of a variable pitch axial flow pump,” M.S. - Master of Science, Middle East Technical University, 2013.