A shutdown operation of a large size steam turbine could possibly cause flashing phenomena of the pooled drain water in low-pressure heaters. The boiled steam is sometimes in the same amount as the main flow in the case where shutdown is executed during low load conditions, and returns to the steam flow path through the extraction lines. A series of experimental work with a subscale model turbine facility has been carried out to investigate the vibration stress behavior, and the steady and unsteady pressures under the flashing back (FB) conditions. It was observed that the blades of the two stages before the last stage (L-2) and a stage before the last stage (L-1) presented their peak vibration stresses immediately after the flash-back flow reached the turbine. In the meantime, the vibration stresses of the last stage (L-0) blades were reduced for a few tens of seconds. It can be thought that the flash-back flow pushed out the reverse flow region around the L-0 blades and allow the blades to be more stable. A detailed examination with measured data of the L-2 blade explained that, as long as the flash-back flow has small wetness, the blade is excited in its specific vibration modes in larger than eighth harmonic of rotational speed, but once the flash-back flow carries water droplets, the fluid force in random frequencies remarkably increases and excites the blade in less than seventh harmonic range.
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An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines
Naoki Shibukawa,
Naoki Shibukawa
Rotating Machine Technology R&D Department,
Power and Industrial Systems Research
and Development Center,
e-mail: naoki.shibukawa@toshiba.co.jp
Power and Industrial Systems Research
and Development Center,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
e-mail: naoki.shibukawa@toshiba.co.jp
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Takao Fukushima,
Takao Fukushima
International Project Engineering Department,
Nuclear Energy Systems & Services Division,
e-mail: takao1.fukushima@toshiba.co.jp
Nuclear Energy Systems & Services Division,
Toshiba Corporation Power Systems Company
,72-34, Horikawa-Cho, Saiwai-ku
,Kawasaki 212-8585
, Japan
e-mail: takao1.fukushima@toshiba.co.jp
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Yoshifumi Iwasaki,
Yoshifumi Iwasaki
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
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Yoshiaki Takada,
Yoshiaki Takada
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
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Itaru Murakami,
Itaru Murakami
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
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Takashi Suzuki
Takashi Suzuki
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
Search for other works by this author on:
Naoki Shibukawa
Rotating Machine Technology R&D Department,
Power and Industrial Systems Research
and Development Center,
e-mail: naoki.shibukawa@toshiba.co.jp
Power and Industrial Systems Research
and Development Center,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
e-mail: naoki.shibukawa@toshiba.co.jp
Takao Fukushima
International Project Engineering Department,
Nuclear Energy Systems & Services Division,
e-mail: takao1.fukushima@toshiba.co.jp
Nuclear Energy Systems & Services Division,
Toshiba Corporation Power Systems Company
,72-34, Horikawa-Cho, Saiwai-ku
,Kawasaki 212-8585
, Japan
e-mail: takao1.fukushima@toshiba.co.jp
Yoshifumi Iwasaki
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
Yoshiaki Takada
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
Itaru Murakami
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
Takashi Suzuki
Turbine Design and Assembling Department,
Keihin Product Operations,
Keihin Product Operations,
Toshiba Corporation Power Systems Company
,2-4, Suehiro-Cho, Tsurumi-ku
,Yokohama 230-0045
, Japan
Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 14, 2014; final manuscript received August 30, 2014; published online November 18, 2014. Editor: David Wisler.
J. Eng. Gas Turbines Power. May 2015, 137(5): 052601 (10 pages)
Published Online: May 1, 2015
Article history
Received:
July 14, 2014
Revision Received:
August 30, 2014
Online:
November 18, 2014
Citation
Shibukawa, N., Fukushima, T., Iwasaki, Y., Takada, Y., Murakami, I., and Suzuki, T. (May 1, 2015). "An Experimental Investigation of the Influence of Flash-Back Flow on Last Three Stages of Low Pressure Steam Turbines." ASME. J. Eng. Gas Turbines Power. May 2015; 137(5): 052601. https://doi.org/10.1115/1.4028674
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