蒸気タービンの湿り損失評価法の開発

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概要

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• This paper describes physics-based moisture loss models for designing wet-steam turbines. Steam turbines in wet-steam conditions experience thermodynamic and mechanical losses caused by the presence of moisture. The developed moisture loss models are composed of six categories : supersaturation loss, condensation loss, accelerating loss, braking loss, capturing loss and pumping loss. These losses are calculated according to the wetness levels in the nozzle & bucket rows, and defined by the functions of steam properties and design factors of turbine stages. The supersaturation loss produced by the non-equilibrium expansion of the wet steam is modeled using the pressure ratio and the isentropic exponent in the supersaturated steam. The loss models are applied to the full-size test turbine data for the prediction of the overall moisture losses. As a result, the developed loss models are found to be very effective for estimating the moisture losses of turbine stages.

著者

• 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

• 小野田 昭博

  （株）東芝 電力・社会システム技術開発センター

• 川岸 裕之

  （株）東芝 電力・社会システム技術開発センター

• 渋川 直紀

  （株）東芝 電力・社会システム技術開発センター

関連論文

• 蒸気タービンの湿り損失評価法の開発
• 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

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