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Experimental study of the effects of temperature variation on droplet size and wetness fraction in a low-pressure model steam turbine

Eberle, T and Schatz, M and Starzmann, J and Grübel, M and Casey, M (2014) Experimental study of the effects of temperature variation on droplet size and wetness fraction in a low-pressure model steam turbine. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 228. pp. 97-106. ISSN 0957-6509

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Abstract

The three-stage low-pressure model steam turbine at the Institute of Thermal Turbomachinery and Machinery Laboratory (ITSM) was used to study the impact of three different steam inlet temperatures on the homogeneous condensation process and the resulting wetness topology. The droplet spectrum as well as the particle number concentration were measured in front of the last stage using an optical-pneumatic probe. At design load, condensation starts inside the stator of the second stage. A change in the steam inlet temperature is able to shift the location of condensation onset within the blade row up- or downstream and even into adjoining blade passages, which leads to significantly different local droplet sizes and wetness fractions due to different local expansion rates. The measured results are compared to steady three-dimensional computational fluid dynamics calculations. The predicted nucleation zones could be largely confirmed by the measurements. Although the trend of measured and calculated droplet size across the span is satisfactory, there are considerable differences between the measured and computed droplet spectrum and wetness fractions. © IMechE 2013 Reprints and permissions: sagepub.co.uk/ journalsPermissions.nav.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 03 Aug 2017 03:04
DOI: