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FLOW CHARACTERISTICS IN A VOLUTE-TYPE CENTRIFUGAL PUMP USING LARGE EDDY SIMULATION

Beomjun Kye
Department of Mechanical & Aerospace Engineering Seoul National University 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Keuntae Park
Department of Mechanical & Aerospace Engineering Seoul National University 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Haecheon Choi
Department of Mechanical & Aerospace Engineering Seoul National University 1, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea

Myungsung Lee
Intelligent Mechatronics Research Center Korea Electronics Technology Institute 388, Songnae-daero, Bucheon 14502, Gyeonggi-do, Korea

Joo-Han Kim
Intelligent Mechatronics Research Center Korea Electronics Technology Institute 388, Songnae-daero, Bucheon 14502, Gyeonggi-do, Korea

Sinopsis

In a centrifugal pump, due to its complicated geometry and flow phenomena, an accurate prediction of flow features is a challenging task. To accurately capture the complex flow physics in turbo pumps, eddy-resolving techniques like large eddy simulations (LES) have attracted much attention. However, there have been a few LES on flow in a centrifugal pump, especially in a volute-type centrifugal pump. In the present study, LES is performed to investigate the flow in a centrifugal volute pump operating at design (Qdesign = 35 m3/h) and off-design conditions (Qoff-design = 20 m3/h). A dynamic global model (Lee et al., 2010) is used for a subgrid-scale model, and an immersed boundary method is adopted in a non-inertial reference frame (Kim & Choi, 2006) to impose the no-slip boundary condition on stationary and rotating surfaces. The pump performances computed are in good agreements with those by experiments. The instantaneous flow fields indicate that separation bubbles, with relative negative azimuthal velocity components in rotating reference frame, are generated locally on the pressure and suction surfaces of impeller blades, respectively. Also, notable amounts of leakage flow are observed at a radial gap between the impeller and the volute casing at the off-design condition. These flow losses exhibit unsteady features which are strongly influenced by the impellervolute interaction, especially at the off-design condition.