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Research Papers: Multiphase Flows

Improvement of Hydrodynamic Performance of a Multiphase Pump Using Design of Experiment Techniques

[+] Author and Article Information
Joon-Hyung Kim, Him-Chan Lee

Department of Mechanical Engineering,
Hanyang University,
222 Wangsimri-ro,
Seongdong-gu, Seoul 113-791, South Korea
Thermal & Fluid System R&BD Group,
Korea Institute of Industrial Technology,
89 Yangdaegiro-gil, Ipjang-myeon,
Seobuk-gu,
Cheonan-si, Chungcheongnam-do 331-822,
South Korea

Jin-Hyuk Kim

Thermal & Fluid System R&BD Group,
Korea Institute of Industrial Technology,
89 Yangdaegiro-gil, Ipjang-myeon,
Seobuk-gu,
Cheonan-si, Chungcheongnam-do 331-822,
South Korea
Advanced Energy and Technology,
University of Science and Technology,
217 Gajeong-Ro,
Yuseong-Gu, Daejeon 305-350, South Korea
e-mail: jinhyuk@kitech.re.kr

Young-Seok Choi

Thermal & Fluid System R&BD Group,
Korea Institute of Industrial Technology,
89 Yangdaegiro-gil, Ipjang-myeon,
Seobuk-gu,
Cheonan-si, Chungcheongnam-do 331-822,
South Korea
Advanced Energy and Technology,
University of Science and Technology,
217 Gajeong-Ro, Yuseong-Gu,
Daejeon 305-350, South Korea

Joon-Yong Yoon

Department of Mechanical Engineering,
Hanyang University,
222 Wangsimri-ro,
Seongdong-gu, Seoul 113-791, South Korea

Il-Soo Yoo, Won-Chul Choi

Department of Extreme Energy Systems,
Korea Institute of Machinery & Material,
156, Gajeongbuk-Ro, Yuseong-Gu,
Daejeon 305-343, South Korea

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 2, 2014; final manuscript received February 15, 2015; published online March 27, 2015. Assoc. Editor: Mark R. Duignan.

J. Fluids Eng 137(8), 081301 (Aug 01, 2015) (15 pages) Paper No: FE-14-1548; doi: 10.1115/1.4029890 History: Received October 02, 2014; Revised February 15, 2015; Online March 27, 2015

Multiphase pumps for offshore plants must perform at high pressure because they are installed on deep-sea floors to pressurize and transfer crude oil in oil wells. As the power for operating pumps should be supplied to deep sea floors using umbilicals, risers, and flow lines (URF), which involve a higher cost to operate pumps, the improvement of pump efficiency is strongly emphasized. In this study, a design optimization to improve the hydrodynamic performance of multiphase pumps for offshore plants was implemented. The design of experiment (DOE) techniques was used for organized design optimization. When DOE was performed, the performance of each test set was evaluated using the verified numerical analysis. In this way, the efficiency of the optimization was improved to save time and cost. The degree to which each design variable affects pump performance was evaluated using fractional factorial design, so that the design variables having a strong effect were selected based on the result. Finally, the optimized model indicating a higher performance level than the base model was generated by design optimization using the response surface method (RSM). How the performance was improved was also analyzed by comparing the internal flow fields of the base model with the optimized model. It was found that the nonuniform flow components observed on the base model were sharply suppressed in the optimized model. In addition, due to the increase of the pressure performance of the optimized model, the volume of air was reduced; therefore, the optimized model showed less energy loss than the base model.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

Meridional plane of the base model

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Fig. 2

Computational fluid dynamics (CFD) methods according to the analysis target (a) performance evaluation of impeller and (b) performance evaluation of impeller and diffuser

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Fig. 3

Conceptual diagram of an element-based finite volume method [14]

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Fig. 4

Schematic diagram of experimental apparatus

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Fig. 5

Algorithm for the optimization procedure

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Fig. 6

Initial design variables of the impeller: (a) variables for the meridional plane and (b) variables for the blade angle

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Fig. 7

Design variables of the diffuser

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Fig. 8

Performance curve for the base model: (a) static pressure rise and (b) static efficiency

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Fig. 9

Isovolumes with the air volume fraction above 0.5: (a) GVF: 5%, (b) GVF: 10%, and (c) GVF: 20%

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Fig. 10

Main effect plot on design variable: (a) effect of total pressure rise (single-phase flow, (b) effect of total pressure rise (multiphase flow), (c) effect of total efficiency (single-phase flow), and (d) effect of total efficiency (multiphase flow)

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Fig. 11

Optimization result of the impeller

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Fig. 12

Performance curve for the optimized impeller (single phase flow): (a) total pressure rise and (b) total efficiency

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Fig. 13

Pressure contour at midspan (single-phase flow): (a) base impeller and (b) optimized impeller

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Fig. 14

Performance curve for the optimized impeller (multiphase flow): (a) total pressure rise and (b) total efficiency

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Fig. 15

Air volume fraction on the meridional plane at GVF 20%: (a) base impeller and (b) optimized impeller

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Fig. 16

Optimization result of the diffuser

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Fig. 17

Performance curve for the optimized model (single-phase flow): (a) static pressure rise and (b) static efficiency

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Fig. 18

Stream line on the blade-to-blade plane at 10% spanwise (single-phase flow): (a) base model and (b) optimized model

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Fig. 19

Performance characteristics according to GVF (Q: 100 m3/h, rotational speed: 3600 rpm): (a) static pressure rise and (b) static efficiency

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