A4 Conference proceedings

Quantification of stator blade shape influence on non-equilibrium condensation in low-pressure steam turbine

Publication Details

Authors: Patel Giteshkumar, Patel Yogini, Turunen-Saaresti Teemu, Grönman Aki

Publication year: 2017

Language: English

Related journal or series: ASME Turbo Expo

Title of parent publication: Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition

Volume number: 8

ISBN: 978-0-7918-5095-4

JUFO level of this publication: 1

Digital Object Identifier (DOI): http://dx.doi.org/10.1115/GT2017-64278

Open Access: Not an Open Access publication


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 a reference for this study. Various modifications including blade trailing edge shapes, blade shape modification via blade pressure and suction surfaces’ tapering, and the 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.

Last updated on 2018-19-10 at 07:55