The expansion of steam flow and the condensation phenomena in an LP turbine depend on both the flow passage shape and the operating conditions. This paper presents the quantification of the influence of local geometrical details of the steam turbine blade including blade surface tapering, dimple inclusion and trailing edge shapes on flow expansion and condensation phenomena. For this purpose, the wet-steam model of ANSYS FLUENT, based on the Eulerian-Eulerian approach, was used. The mixture of vapor and liquid phases was solved by compressible Reynolds-averaged Navier-Stokes equations. The low inlet superheat case of White et al. [1] which is conducted with planar stator cascade was used as reference for this study. Various modifications including blade trailing edge shapes, blade shape modification via blade pressure and suction surfaces’ tapering, and addition of dimple feature to the blade pressure surface were applied to the blade profile. The presented results revealed that the applied blade shape modifications affected nucleation and droplet growth processes, shock wave structures and entropy generation rates. The influence of blade shape on loss generation was presented by calculating the Markov energy loss coefficients. The presented analysis exhibits that the blade shape alteration influences the overall loss generation that occur due to the irreversible heat and mass transfer during the condensation process.
ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5095-4
PROCEEDINGS PAPER
Quantification of Stator Blade Shape Influence on Non-Equilibrium Condensation in Low-Pressure Steam Turbine
Giteshkumar Patel
,
Giteshkumar Patel
Lappeenranta University of Technology, Lappeenranta, Finland
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Yogini Patel
,
Yogini Patel
Lappeenranta University of Technology, Lappeenranta, Finland
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Teemu Turunen-Saaresti
,
Teemu Turunen-Saaresti
Lappeenranta University of Technology, Lappeenranta, Finland
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Aki Grönman
Aki Grönman
Lappeenranta University of Technology, Lappeenranta, Finland
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Author Information
Giteshkumar Patel
Lappeenranta University of Technology, Lappeenranta, Finland
Yogini Patel
Lappeenranta University of Technology, Lappeenranta, Finland
Teemu Turunen-Saaresti
Lappeenranta University of Technology, Lappeenranta, Finland
Aki Grönman
Lappeenranta University of Technology, Lappeenranta, Finland
Paper No:
GT2017-64278, V008T29A028; 11 pages
Published Online:
August 17, 2017
Citation
Patel, Giteshkumar, Patel, Yogini, Turunen-Saaresti, Teemu, and Grönman, Aki. "Quantification of Stator Blade Shape Influence on Non-Equilibrium Condensation in Low-Pressure Steam Turbine." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines. Charlotte, North Carolina, USA. June 26–30, 2017. V008T29A028. ASME. https://doi.org/10.1115/GT2017-64278
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