Development of highly efficient and robust ultra-long last stage blade for high backpressure

0507454 - ÚT 2020 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Novák, O. - Bobčík, M. - Sláma, V. - Rudas, B. - Kellner, J. - Měšťánek, P. - Hlous, J. - Šimka, Z. - Luxa, Martin - Šimurda, David - Živný, A. - Macalka, A. - Ira, J.
Development of highly efficient and robust ultra-long last stage blade for high backpressure.
Proceedings of the ASME Turbo Expo: Turbomachinery Technical Conference and Exposition. New York: American Society of Mechanical Engineers (ASME), 2019, č. článku UNSP V008T29A007. 8. ISBN 978-0-7918-5871-4.
[ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. Phoenix (US), 17.06.2019-21.06.2019]
Grant CEP: GA TA ČR TH02020057
Institucionální podpora: RVO:61388998
Klíčová slova: ultra long turbine blade * last stage * transonic flow
Obor OECD: Applied mechanics

For modern steam turbines with large operating range and enhanced efficiency an ultra-long last stage rotor blade in a low pressure turbine part for high backpressure and 50 Hz fixed speed operation have been developed. An advanced design approach was used to create the blade shape with a high thermodynamic efficiency, high natural frequencies and a very high safety factor of average radial static stress in the blade span. Furthermore, the tip section of the bucket was improved to decrease a static tension and the hub section was refined to simplify the assembly. Tip and hub airfoils were experimentally validated in a supersonic wind tunnel. An advanced in-house procedure using numerical analysis to predict a potential danger of unstalled flutter was carried out for wide range of operating conditions.
Trvalý link: http://hdl.handle.net/11104/0302647