Centrifugal pump impellers for wastewater applications have to be designed to meet additional requirements compared to clearwater pumps. Therefore these impellers usually have only one to three relatively thick blades and large width to diameter ratios. The presented study deals with the effect of trailing edge modifications, especially under-filing, to this class of impellers. Two wastewater pump impellers with different specific speeds have been investigated numerically and a detailed loss analysis has been made for the impellers with default and modified trailing edge configurations. In case of the impeller with lower specific speed the head but not the efficiency could be increased by trailing edge under-filing. For the impeller with higher specific speed, under-filing resulted in an significant increase in head and efficiency. The analysis of the losses showed how the losses in different sections of the impeller are affected by the trailing edge modifications and how and under what circumstances the efficiency can be increased in this way. Experiments on the test rig confirmed the numerical results and stated an increase in head of 7.7 percent at no increase in efficiency for the impeller with the lower specific speed and an increase in head of 11.7 percent at an efficiency gain of 1.7 percent at the design flow-rate and even 4.4 percent increase in maximum efficiency for the impeller with higher specific speed.
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ASME 2017 Fluids Engineering Division Summer Meeting
July 30–August 3, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5804-2
PROCEEDINGS PAPER
Numerical and Experimental Investigation of Trailing Edge Modifications of Centrifugal Wastewater Pump Impellers Available to Purchase
Oliver Litfin,
Oliver Litfin
Institute of Fluid Mechanics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
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Antonio Delgado,
Antonio Delgado
Institute of Fluid Mechanics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
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Kais Haddad,
Kais Haddad
Sulzer Pump Solutions Germany GmbH, Lohmar, Germany
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Horst Klein
Horst Klein
Sulzer Pump Solutions Germany GmbH, Lohmar, Germany
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Oliver Litfin
Institute of Fluid Mechanics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
Antonio Delgado
Institute of Fluid Mechanics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
Kais Haddad
Sulzer Pump Solutions Germany GmbH, Lohmar, Germany
Horst Klein
Sulzer Pump Solutions Germany GmbH, Lohmar, Germany
Paper No:
FEDSM2017-69123, V01AT05A008; 15 pages
Published Online:
October 24, 2017
Citation
Litfin, O, Delgado, A, Haddad, K, & Klein, H. "Numerical and Experimental Investigation of Trailing Edge Modifications of Centrifugal Wastewater Pump Impellers." Proceedings of the ASME 2017 Fluids Engineering Division Summer Meeting. Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery. Waikoloa, Hawaii, USA. July 30–August 3, 2017. V01AT05A008. ASME. https://doi.org/10.1115/FEDSM2017-69123
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