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Research Papers: Flows in Complex Systems

Comparison of Flow Fields in a Centrifugal Pump Among Different Tracer Particles by Particle Image Velocimetry

[+] Author and Article Information
Yalin Li

National Research Center of Pumps,
Jiangsu University,
Zhenjiang,
Jiangsu 212013, China
e-mail: yuanfangfriend@126.com

Shouqi Yuan

National Research Center of Pumps,
Jiangsu University,
Zhenjiang,
Jiangsu 212013, China
e-mail: Shouqiy@ujs.edu.cn

Xikun Wang

Maritime Research Centre,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
e-mail: cxkwang@ntu.edu.sg

Soon Keat Tan

Maritime Research Centre,
Nanyang Technological University,
50 Nanyang Avenue,
Singapore 639798
e-mail: ctansk@ntu.edu.sg

Jieyun Mao

National Research Center of Pumps,
Jiangsu University,
Zhenjiang,
Jiangsu 212013, China
e-mail: ujsmjy@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 15, 2015; final manuscript received January 14, 2016; published online March 24, 2016. Assoc. Editor: Peter Vorobieff.

J. Fluids Eng 138(6), 061105 (Mar 24, 2016) (14 pages) Paper No: FE-15-1030; doi: 10.1115/1.4032562 History: Received January 15, 2015; Revised January 14, 2016

This paper presents an experimental investigation of the flow fields in a centrifugal pump by particle image velocimetry (PIV) technique with two different tracer particles, all designed for the same operating point. In order to systematically analyze the tracking characteristics of tracer particles once used in centrifugal pump by Basset–Boussinesq–Oseen (BBO) equation, aluminum powder (AP, with high density ratio and small diameter) and hollow glass spheres (HGS, with neutral density and large diameter) were selected. The velocity fields obtained for AP and HGS were presented and compared, in order to enhance the understanding of their tracking properties in rotating impeller. The results show that AP and HGS give nearly the same phase-averaged velocity fields except at two small regions. BBO extended equation by the phase average theory in a centrifugal pump was applied to explain the first difference, namely, why the velocity of HGS is higher than that of AP in the low-speed zone. In addition, the mean vorticity distributions for AP and HGS show high strength velocity micelles with different directions of development and dissemination, which causes the second difference in energy exchange. As a consequence, HGS tends to conglomerate closer to the pressure side (PS) near the impeller outlet than AP

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Figures

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Fig. 1

Sketch of the experimental setup

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Fig. 2

Test model of DBCP. (a) The geometry of impeller meridional plane (zy), (b) left view form −z axis, and (c): 3D solid model.

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Fig. 3

Performance curves of DBCP at 750 rpm. The tested condition is highlighted by a dashed line.

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Fig. 4

PIV test plane and velocity triangle in centrifugal impeller passage

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Fig. 5

Amplitude ratio (a) and phase angle (b) for different seeding particles

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Fig. 6

Amplitude ratio (a) and phase angle (b) for particles selected in DBCP

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Fig. 7

Photograph of the two tracer particles used (a) AP and (b) HGS

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Fig. 8

Relative velocity fields in two-blade impeller at Qsep, (a)for AP, (b) for HGS, (c) velocity contour lines for three zonesbetween AP and HGS, “A” is the high-speed region where the velocity magnitude is greater than 3 m/s; “B” is the intermediate-speed zone where the velocity magnitude is between 1 m/s and 3 m/s; and “C” is the low-speed zone where the velocity magnitude is less than 1 m/s

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Fig. 9

Comparison of phase-averaged relative velocities at Φ = 19 deg and r/r2 = (a) 0.55, (b) 0.65, (c) 0.75, and (d) 0.85

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Fig. 10

Comparison of mean phase-averaged relative velocities at Φ = 19 deg

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Fig. 11

Comparison of phase-averaged relative velocity contour at Φ = 19 deg between AP (a) and HGS (b)

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Fig. 12

Schematic diagram of external force on particles in a rotating impeller

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Fig. 13

Slip velocity of AP (a) and HGS (b) in centrifugal impeller calculated by Eq. (14)

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Fig. 14

Slip velocity error (W¯slip/W¯f) of AP (a) and HGS (b) in the centrifugal impeller

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Fig. 15

Vorticity distributions in DBCP: (a) for AP and (b) for HGS

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Fig. 16

Backflow position and velocity comparison between AP and HGS: backflow position of AP (a) and HGS (b) at radial stations of r/r2 = {0.45,0.55,0.70,0.90}; (c) velocity comparison on ideal flow lines and (d) velocity triangles between AP and HGS

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