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Research Papers: Energy Systems Analysis

Numerical Study on the First Stage Head Degradation in an Electrical Submersible Pump With Population Balance Model

[+] Author and Article Information
Yiming Chen

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: yimingchen.ok@gmail.com

Abhay Patil

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: abhyapatil@tamu.edu

Yi Chen

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: bagecy@gmail.com

Changrui Bai

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: baichangrui@gmail.com

Yintao Wang

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: yintao2012@gmail.com

Gerald Morrison

Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77843-3127
e-mail: gmorrison@tamu.edu

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 6, 2018; final manuscript received August 31, 2018; published online September 26, 2018. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(2), 022003 (Sep 26, 2018) (11 pages) Paper No: JERT-18-1256; doi: 10.1115/1.4041408 History: Received April 06, 2018; Revised August 31, 2018

Based on previous experiment result, an assumption is made to explain the abnormal head degradation in the first stage of an electrical submersible pump (ESP): the bubbles' breaking up and coalescence effect with compressibility is the main reason of this phenomenon. To investigate the head degradation problem inside the ESP, a series of numerical simulations are performed on the first stage of the split-vane impeller pump commonly employed for gas handling purpose. These three-dimensional transient Eulerian multiphase simulations are divided into two groups: one group with the traditional fixed bubble size method and the other with the ANSYS population balancing model (PBM) allowing the bubbles to break up and coalesce. The simulation result with the changing bubble size matches well with the experiment data, which supports the previous assumption. The flow field based on PBM simulation is visualized and analyzed. Also the separation of phases is discovered with large volume of gas accumulating at the suction side of the impeller trailing blades, which is also supported by experimental observation.

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References

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Figures

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Fig. 3

Unstructured mesh in the main flow path

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Fig. 1

The split-vane impeller

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Fig. 4

Pressure distribution on blades and hubs of the first stage at 20% GVF

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Fig. 5

Pressure distribution on the section plane of the first stage at 20% GVF

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Fig. 6

Pressure distribution on blades and hubs of the first stage at 10% GVF

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Fig. 7

Pressure distribution on the section plane of the first stage at 10% GVF

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Fig. 8

Bin fraction distribution for first stage of 10% GVF simulation

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Fig. 9

Bin fraction distribution for first stage of 20% GVF simulation

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Fig. 10

Air volume fraction in first stage of various GVF tests (left 10% GVF; right 20%GVF)

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Fig. 11

Example of large bubble (4 mm) existence in simulation

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Fig. 12

Three-dimensional streamlines of water inside first impeller at 20% GVF without PBM

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Fig. 13

Three-dimensional streamlines of water inside first impeller at 20% GVF with PBM

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Fig. 14

Three-dimensional streamlines of air inside first impeller at 20% GVF (left: no PBM; right: with PBM)

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Fig. 15

Experiment support of the PBM result

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Fig. 16

Three-dimensional streamlines of water in the first impeller at various GVFs

Tables

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