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Effect of Operating Conditions on the Performance of Gas–Liquid Mixture Roots Pumps

Author

Listed:
  • Qing Guo

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

  • Kai Luo

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

  • Daijin Li

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

  • Chuang Huang

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

  • Kan Qin

    (School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China)

Abstract

The performance of the gas–liquid mixture Roots pump at different operating conditions is investigated in this paper. The pump efficiency was first increased from 48% to 64%, and then decreased to 59% with the increased inlet CO 2 volume fraction (from 0.8 to 1). The increased rotational speed (from 1000 rpm to 4000 rpm) and pressure ratio (from 2 to 10) can lead to a reduction in the pump’s efficiency from 67% to 43% and from 48% to 33%, respectively. The variation in the pump’s efficiency is affected by the volumetric efficiency and the flow efficiency simultaneously. The high pressure and the CO 2 volume fraction in the outlet zone can increase the leakage, leading to a reduction in the volumetric efficiency. The flow efficiency decreases with the increase in the local pressure at the outlet zone and the backflow density. The outlet zone pressure can also affect the fluid properties by changing the density of the gas phase. Therefore, the combined effect of the outlet zone pressure and the working fluid properties is considered to be the main factor affecting the performance. This paper further explores the suitability of Roots pumps for compressing gas–liquid mixtures.

Suggested Citation

  • Qing Guo & Kai Luo & Daijin Li & Chuang Huang & Kan Qin, 2021. "Effect of Operating Conditions on the Performance of Gas–Liquid Mixture Roots Pumps," Energies, MDPI, vol. 14(17), pages 1-23, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5361-:d:624017
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    References listed on IDEAS

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    1. Wenwu Zhang & Zhiyi Yu & Muhammad Noaman Zahid & Yongjiang Li, 2018. "Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis," Energies, MDPI, vol. 11(5), pages 1-16, April.
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    3. Qiaorui Si & Gérard Bois & Minquan Liao & Haoyang Zhang & Qianglei Cui & Shouqi Yuan, 2019. "A Comparative Study on Centrifugal Pump Designs and Two-Phase Flow Characteristic under Inlet Gas Entrainment Conditions," Energies, MDPI, vol. 13(1), pages 1-25, December.
    4. Thomas Lobsinger & Timm Hieronymus & Gunther Brenner, 2020. "A CFD Investigation of a 2D Balanced Vane Pump Focusing on Leakage Flows and Multiphase Flow Characteristics," Energies, MDPI, vol. 13(13), pages 1-24, June.
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