Effect of blade surface roughness on condensation process in a stator cascade
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 8 January 2020
Issue publication date: 19 June 2020
Abstract
Purpose
The flow state of wet steam will affect the thermodynamic and aerodynamic characteristics of steam turbine. The purpose of this study is to effectively control the wetness losses caused by wet steam condensation, and hence a cascade of 600 MW steam turbine was taken as the research object.
Design/methodology/approach
The influence of blade surface roughness on the condensation characteristics was analyzed, and the dehumidification mechanism and wetness control effect were obtained.
Findings
With the increase of blade surface roughness, the peak nucleation rate decreases gradually. According to the Mach number distribution on the blade surface, there is a sensitive region for the influence of roughness on the aerodynamic performance of cascade. The sensitive region of nucleation rate roughness should be between 50 and 150 µm.
Originality/value
The increase of blade surface roughness will increase the dynamic loss in cascade, but it can reduce the thermodynamic loss caused by condensation to a certain extent.
Keywords
Acknowledgements
The authors are thankful for the support provided by the Fundamental Research Funds for the Central Universities of China (grant no. 2019MS092), Science and Technology Planning Project of Guangdong Province, China (grant no. 2015B010101002) and the National Science and Technology Support Program of China (grant no. 2014BAA06B01).
Author Contributions: All authors contributed to this work. Xu Han is the main author of this work. Zhonghe Han guided the analysis and the writing of the paper. Xiangyu Liu and Yunyun Yuan assisted with the modeling.
Conflicts of Interest: The authors declare that there are no conflicts of interest regarding the publication of this paper.
Citation
Han, X., Liu, X., Yuan, Y. and Han, Z. (2020), "Effect of blade surface roughness on condensation process in a stator cascade", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 30 No. 8, pp. 4067-4081. https://doi.org/10.1108/HFF-10-2019-0736
Publisher
:Emerald Publishing Limited
Copyright © 2019, Emerald Publishing Limited