Partial Admission Stages of High Efficiency for a Microturbine

Krzysztof Kosowski; Robert Stępień; Wojciech Włodarski; Marian Piwowarski; Łukasz Hirt

Partial Admission Stages of High Efficiency for a Microturbine

Abstract

The paper presents the results of a design analysis of a microturbine for a cogeneration micro-power plant working in accordance with organic Rankine cycle. The heat power of the plant is assumed equal to 20kW and the corresponding available electric output is estimated to be about 3 kW. After the design analysis, the axial turbine with partial admission in all stages was built and tested experimentally. Special attentionwas paid to the design of the nozzle cascades forming partial admission arcs. The results showed that, for example, remarkable flow separation zones appeared in the nozzle flow channels placed at the edge of the admission segments. The modifycations of these channels reduced the undesirable effect. All the stages were equipped with movable blade shields for reducing windage losses. The effect of the angular position of the shields in the succeeding stages was investigated numerically and experimentally. The examples of the results are shown and discussed in the paper. The proposed micro-turbine has a relatively high efficiency (80%) and the rotor speed of about 8000 rpm which seems to be a low value compared with the other considered variants.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: Advances in Vibration Engineering no. 2, pages 441 - 448,
ISSN: 0972-5768
Language:: English
Publication year:: 2014
Bibliographic description:: Kosowski K., Stępień R., Włodarski W., Piwowarski M., Hirt Ł.: Partial Admission Stages of High Efficiency for a Microturbine// Advances in Vibration Engineering. -Vol. 2, nr. 5 (2014), s.441-448
Verified by:: Gdańsk University of Technology

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