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Wet steam flow and condensation loss in turbine blade cascades

Wen, Chuang; Yang, Yan; Ding, Hongbing; Sun, Chunqian; Yan, Yuying

Authors

Chuang Wen

Yan Yang

Hongbing Ding

Chunqian Sun

YUYING YAN YUYING.YAN@NOTTINGHAM.AC.UK
Professor of Thermofluids Engineering



Abstract

This study develops a wet steam modelling to solve the phase change process inside the blade cascade of a steam turbine. The comparative study is carried out to understand the impact of the dry gas model and wet steam model on predicting the flow behaviours in a steam turbine. The effect of the cutback of the trailing edge on the flow structure and nonequilibrium condensation is evaluated in blade cascades. The results show that the dry gas assumption without considering the phase change process predicts fraudulently flow separations near the trailing edge to induce oblique waves. The maximum liquid fraction can reach approximately 0.051 based on the wet steam flow modelling. The condensation-evaporation processes in the blade cascades cause a condensation loss of 0.118 MW. The stronger expansion flow is obtained to induce the earlier onset of the homogeneous nucleation process with an increasing cutback of the trailing edge. The 21% cutback of the trailing edge leads to strong flow separations on the suction side to severely deteriorate the flow condition in blade cascades. It suggests that the cutback of the trailing edge by 14% is acceptable to repair damaged blades considering the flow structure, nonequilibrium phase change and condensation loss.

Citation

Wen, C., Yang, Y., Ding, H., Sun, C., & Yan, Y. (2021). Wet steam flow and condensation loss in turbine blade cascades. Applied Thermal Engineering, 189, https://doi.org/10.1016/j.applthermaleng.2021.116748

Journal Article Type Article
Acceptance Date Feb 14, 2021
Online Publication Date Feb 20, 2021
Publication Date 2021-05
Deposit Date Mar 2, 2021
Publicly Available Date Feb 21, 2022
Journal Applied Thermal Engineering
Print ISSN 1359-4311
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 189
Article Number 116748
DOI https://doi.org/10.1016/j.applthermaleng.2021.116748
Keywords Industrial and Manufacturing Engineering; Energy Engineering and Power Technology
Public URL https://nottingham-repository.worktribe.com/output/5362841
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S1359431121002039
Additional Information This article is maintained by: Elsevier; Article Title: Wet steam flow and condensation loss in turbine blade cascades; Journal Title: Applied Thermal Engineering; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.applthermaleng.2021.116748; Content Type: article; Copyright: © 2021 Elsevier Ltd. All rights reserved.