Numerical Simulation on the Flow Field in a Turbine Stage with Upstream Flow Injection from the Outer Casing : Effects of the Injection Angle

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概要

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• Flow injection is being used in steam turbines for some combined or geothermal plants in order to increase its total thermal efficiency. It can be easily imagined, however, that such a flow injection is accompanied by additional aerodynamic loss due to the flow mixing or the change in local flow angle. Preliminary three-dimensional steady numerical simulations are conducted for the flow field inside the chamber from which the secondary flow is injected. The results showed a small variation of the flow velocity at the injection slot and provided useful information concerning the magnitude of the pitchwise variation of the injection angle. Further numerical simulations in a turbine stage were then performed by prescribing different injection angle distribution at the injection slot. The turbine stage computations revealed the existence of a high loss region generated from the interaction of the injected flow and the passage vortex near the tip of the nozzle vanes. It was found that injection angles orientated to the suction side of the stator provided lower loss values, while cases where flow was injected to the pressure side minimized the flow angle deviation.

• 一般社団法人日本機械学会の論文
• 2003-02-15

著者

• Favaretto Carlos

  Department Of Mechanical Engineering Iwate University

• FUNAZAKI Ken-ichi

  Department of Mechanical Engineering, Iwate University

• Tanuma Tadashi

  Steam Turbine Design Group Keihin Product Operations Toshiba Corporation

• Funazaki Ken-ichi

  Department Of Mechanical Engineering Iwate University

• KAMATA Masaya

  Department of Mechanical Engineering, Iwate University

• Kamata Masaya

  Department Of Mechanical Engineering Iwate University

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