Title: Experimental investigation on performance of a control stage turbine under partial admission
Authors: Berger, Antonio 
Polklas, Thomas
Brunn, Oliver
Joos, Franz 
Language: eng
Keywords: Partial Admission;Steam Turbine
Subject (DDC): DDC - Dewey Decimal Classification::600 Technik::620 Ingenieurwissenschaften
Issue Date: Apr-2019
Document Type: Article
Pages: 1-12
Conference: 13th European Turbomachinery Fluid Dynamics and Thermodynamics 2019
Operation of industrial steam turbines under partial admission is usually implemented in order to cope with fluctuations in demand while maintaining a high efficiency. Subject of the article presented is the experimental investigation of the performance and efficiency of a control stage operated with air, under partial admission. Furthermore, the steady state blade loading distribution on the stator in a free passage and at the entry into a not admitted passage is observed.
For the experiment, the single-staged axial-flow turbine is operated with varying shaft speed, pressure ratio and admission rate, realized by flow blockaging. Two rotationally symmetric stator endwall designs are tested: a plane and a contoured endwall.
Reducing the admission rate at part load decreases the efficiency, especially at high circumferential velocities as precedent investigations showed. Pumping and mixing loss behaviour shows a different scale across the performance map. To prove CFD Simulations, results of the blade loading distribution on the stator are acquired.
Organization Units (connected with the publication): Strömungsmaschinen in der Energietechnik 
Bundesministerium für Wirtschaft und Energie (BMWi)
Publisher DOI: 10.29008/ETC2019-135
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