蒸気タービンの湿り流量係数計算法の構築
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概要
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This paper describes a calculation method of moisture flow discharge coefficient for designing wet-steam turbines. The flow discharge coefficient in wet-steam conditions is different from that in dry-steam conditions, because the former is affected by supersaturation phenomenon and wetness fraction. An accurate prediction of the flow discharge coefficient is required for flow-pattern design in turbine stages. The developed calculation method is divided four models according to the wetness levels in the nozzle & bucket rows, and defined by the functions of wet-steam properties, such as saturated & supersaturated isentropic exponents, wetness fraction, and pressure ratio in the nozzle & bucket rows. The calculation method is applied to a full-size & a model test turbine data for the prediction of the moisture flow discharge coefficient. As a result, the developed calculation method is found to be very effective for estimating the moisture flow discharge coefficient in a wide range of wetness fractions.
著者
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新関 良樹
(株)東芝 電力システム社 電力・社会システム技術開発センター
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小野田 昭博
(株)東芝 電力・社会システム技術開発センター
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川岸 裕之
(株)東芝 電力・社会システム技術開発センター
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渋川 直紀
(株)東芝 電力・社会システム技術開発センター
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手島 智博
(株)東芝 電力・社会システム技術開発センター
関連論文
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- 蒸気タービンの湿り流量係数計算法の構築
- Velocity Measurement and Particle Size Estimation for Two-Phase Flows in a Steam Turbine
- 蒸気タービンの低圧段落の湿り損失特性