The titanium 48-inch last stage blade that has world’s largest class exhaust annulus area and tip speed for 60Hz steam turbines has been developed. Concept of this blade is to achieve high performance and compact design of steam turbine for 1000MW thermal power plant and 300MW combined cycle plant. In the design of this blade, the optimization design has been done by using the recent analysis technologies, three dimensional CFD in aerodynamic design and FEA in mechanical design. The blade has curved axial fir-tree dovetail, snubber cover both at the tip and at the mid-span. To achieve superior vibration characteristics, continuously coupled structure was adopted for blade connection. To confirm the validity of design, first, sub-scale model blades were provided and tested in model steam turbine test facilities. Second, one row of actual size blades were assembled on the wheel of test rotor and were exposed rotating vibration test in a wheel box. Finally, these blades were tested at actual steam conditions in a full scale steam turbine test facility. In this paper, aerodynamic and mechanical design features will be introduced, and the test results of both sub-scale and actual size blades under real steam turbine operating conditions will be presented.
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ASME 2011 Power Conference collocated with JSME ICOPE 2011
July 12–14, 2011
Denver, Colorado, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-4459-5
PROCEEDINGS PAPER
Development of 60Hz Titanium 48-Inch Last Stage Blade for Steam Turbine
Yoriharu Murata,
Yoriharu Murata
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Naoki Shibukawa,
Naoki Shibukawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Itaru Murakami,
Itaru Murakami
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Joji Kaneko,
Joji Kaneko
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Kenichi Okuno
Kenichi Okuno
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Yoriharu Murata
Toshiba Corporation, Yokohama, Kanagawa, Japan
Naoki Shibukawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
Itaru Murakami
Toshiba Corporation, Yokohama, Kanagawa, Japan
Joji Kaneko
Toshiba Corporation, Yokohama, Kanagawa, Japan
Kenichi Okuno
Toshiba Corporation, Yokohama, Kanagawa, Japan
Paper No:
POWER2011-55465, pp. 695-700; 6 pages
Published Online:
February 28, 2012
Citation
Murata, Y, Shibukawa, N, Murakami, I, Kaneko, J, & Okuno, K. "Development of 60Hz Titanium 48-Inch Last Stage Blade for Steam Turbine." Proceedings of the ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASME 2011 Power Conference, Volume 1. Denver, Colorado, USA. July 12–14, 2011. pp. 695-700. ASME. https://doi.org/10.1115/POWER2011-55465
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