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Performance of non-equilibrium condensation flow in wet steam zone of steam turbine based on modified model

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  • Hu, Pengfei
  • Zhao, Pu
  • Li, Qi
  • Hou, Tianbo
  • Wang, Shibo
  • Cao, Lihua
  • Wang, Yanhong

Abstract

In order to accurately describe the homogeneous nucleation process of wet steam two-phase flow and improve the reliability of steam condensation flow calculation, in this paper the classical homogeneous nucleation theory is deduced and summarized based on the theory of thermodynamic free energy of molecular condensation, and a more accurate modified homogeneous nucleation model is proposed based on the Kantrowitz non-isothermal modified nucleation model. Firstly, the non-equilibrium condensation flow in Moses-Stein nozzle is calculated using presented modified model. It is found that the simulated results by the modified model are in good agreement with the previous experimental results, and the minimum supercooling degree required for nucleation is about 17 K. In addition, the effect of steam expansion rate on nucleation of Dykas cascade is also investigated. It is found that increasing inlet steam superheat and decreasing expansion rate can reduce the non-equilibrium condensation flow loss. Finally, the non-equilibrium condensation flow in three-dimensional turbine cascade is numerically studied. The results indicate that the values of expansion rate, nucleation rate, droplet number and wetness will decrease with the increase of blade height.

Suggested Citation

  • Hu, Pengfei & Zhao, Pu & Li, Qi & Hou, Tianbo & Wang, Shibo & Cao, Lihua & Wang, Yanhong, 2023. "Performance of non-equilibrium condensation flow in wet steam zone of steam turbine based on modified model," Energy, Elsevier, vol. 267(C).
    • Handle: RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034582
    DOI: 10.1016/j.energy.2022.126571
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    References listed on IDEAS

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    1. Hoseinzade, Davood & Lakzian, Esmail & Hashemian, Ali, 2021. "A blackbox optimization of volumetric heating rate for reducing the wetness of the steam flow through turbine blades," Energy, Elsevier, vol. 220(C).
    2. Yang, Yan & Zhu, Xiaowei & Yan, Yuying & Ding, Hongbing & Wen, Chuang, 2019. "Performance of supersonic steam ejectors considering the nonequilibrium condensation phenomenon for efficient energy utilisation," Applied Energy, Elsevier, vol. 242(C), pages 157-167.
    3. Wróblewski, Włodzimierz & Dykas, Sławomir, 2016. "Two-fluid model with droplet size distribution for condensing steam flows," Energy, Elsevier, vol. 106(C), pages 112-120.
    4. Aliabadi, Mohammad Ali Faghih & Lakzian, Esmail & Khazaei, Iman & Jahangiri, Ali, 2020. "A comprehensive investigation of finding the best location for hot steam injection into the wet steam turbine blade cascade," Energy, Elsevier, vol. 190(C).
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