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Energy efficiency prediction model and energy characteristics of subsea disc pump based on velocity slip and similarity theory

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  • Pei, Yingju
  • Liu, Qingyou
  • Wang, Chuan
  • Wang, Guorong

Abstract

The variable-speed energy efficiency prediction model (EEPM) of subsea disc pump is the key to achieve double gradient in deepwater drilling, and it has also been the difficulty of pressure control matching and energy conservation. In this paper, the radial slip vortices are fully considered, and average slip method of circumferential velocity, relative velocity and absolute velocity at impeller outlet is proposed. Based on hydraulic energy loss and mechanical energy loss, the calculation method of theoretical head and similar parabola in similarity theory is improved, and EEPM is established. In addition, a new multifunctional test system and data processing model are designed to reduce the error. The experimental results show that the accuracy of EEPM is increased by about 4% when deviating from the rated speed by more than 20%, and the accuracy is about 99% within 20%. From the simulation, the flow passage is mainly a mixed-type movement, such as S-type double vortex and O-type single vortex. The turbulence kinetic energy near the volute tongue is the largest. The study improves the energy efficiency of drilling pressure regulation, and also provides a new perspective to the energy efficiency optimization and energy conservation of similar centrifugal pump and vortex pump.

Suggested Citation

  • Pei, Yingju & Liu, Qingyou & Wang, Chuan & Wang, Guorong, 2021. "Energy efficiency prediction model and energy characteristics of subsea disc pump based on velocity slip and similarity theory," Energy, Elsevier, vol. 229(C).
    • Handle: RePEc:eee:energy:v:229:y:2021:i:c:s0360544221009385
    DOI: 10.1016/j.energy.2021.120690
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    2. Wang, Chaoyue & Wang, Benhong & Wang, Fujun & Wang, Hao & Hong, Yiping & Wu, Jie & Li, Dianji & Shao, Chunbing, 2024. "On the scale effect of energy conversion in large-scale bulb tubular pump: Characteristics, mechanisms and applications," Energy, Elsevier, vol. 292(C).

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