NUMERICAL STUDY OF UNSTEADY FLOW CHARACTERISTICS IN REGENERATIVE PUMP

Document Type : Research Paper

Author

Mechanical Power Engineering Department, High Institute of Energy, South Valley University, Aswan, Egypt

Abstract

Regenerative pumps are turbomachines that achieve lower mass fluxes but higher-pressure differences than comparable pumps at the same circumferential velocity. The construction of these machines is very simple and inexpensive. On the other hand their efficiency does not exceed 45 % and they are noisy. To improve efficiency and reduce noise generation, a detailed knowledge of the unsteady flow in the machine is essential. In this work, we present unsteady flow characteristics of a typical regenerative pump based on numerical results obtained by using CFX-Tascflow code. The numerical results show highly unsteady pressure fluctuations around the stripper near both inlet and outlet ports. The lower pressure predicted near the inlet port indicates that the machine is prone to suffer cavitation problems. The amplitude of pressure fluctuation near the inlet is much higher than the outlet.

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JES. Journal of Engineering Sciences
Volume 35, No 4
July and August 2007
Pages 933-943

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