NDLI: Numerical study and control method of interaction of nucleation and boundary layer separation in condensing flow

Content Provider	Springer Nature Link
Author	An, Liansuo Wang, Zhi Han, Zhonghe
Copyright Year	2009
Abstract	The spontaneous nucleation flow in turbine cascade was numerically studied. The model was implemented within a full Navier-Stokes viscous flow solution procedure and the process of condensation was calculated by the quadrature method of moments that shows good accuracy with very broad size distributions. Results were presented for viscous and inviscous flow, showing the influence of boundary layer separation and wake vortices on spontaneous nucleation. The results show that the degree of flow separation in wet steam flow is greater than that in superheated steam flow due to condensation shock and that the loss cannot be neglected. Furthermore, the impact of boundary layer separation and wake vortices on velocity profiles and its implications for profile loss were considered. The calculations showed that layer separation and wake vortices influence nucleation rate, leading to different droplet distributions. A method for controlling homogeneous nucleation and for reducing degree of flow separation in high-speed transonic wet steam flow was presented. The liquid phase parameter distribution is sensitive to the suction side profile of turbine cascade, which impacts the nucleation rate distribution leading to different droplet distributions and affects the degree of flow separation. The numerical study provides a practical design method for turbine blade to reduce wetness losses.
Starting Page	254
Ending Page	261
Page Count	8
File Format	PDF
ISSN	16737393
Journal	Frontiers of Energy and Power Engineering in China
Volume Number	3
Issue Number	3
e-ISSN	16737504
Language	English
Publisher	SP Higher Education Press
Publisher Date	2009-06-26
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	wet steam two-phase flow spontaneous condensation numerical simulation flow separation profile loss Energy Technology
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology

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