• Title/Summary/Keyword: LP Exhaust Hood

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Flow Characteristics of a LP Exhaust Hood for USC Steam Turbines (USC 증기터빈용 LP Exhaust Hood 유동특성)

  • Lee, Byeong E.;Kim, Jin W.;Park, Koo H.;Nah, Un H.;Lee, Soo E.
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.297-302
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    • 2004
  • CFD analysis has been performed to investigate flow behavior in LP exhaust hood of steam turbines and evaluate exhaust loss, which is directly related to the steam turbine performance, in it. Development of the optimum shape of LP exhaust hood has been done with an improved shape of steam guide, which plays a key role in terms of cost as well as performance. The newly developed LP exhaust hood will be applied for a large USC steam turbine having a capacity of 1,000 MW.

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Numerical investigation of LP turbine-exhaust hood interaction in the steam turbine exhaust system (스팀터빈 Exhaust System에서 LP터빈과 Exhaust Hood 사이의 간섭에 대한 수치해석적 연구)

  • Im, Ji-Hyun;Joo, Won-Gu;Kim, Young-Sang;Im, Hong-Sik
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.291-294
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    • 2006
  • Exhaust system of steam turbines consists of an annular diffuser and a collector and connects the last stage turbine and the condenser. The system is used to transfer the turbine leaving kinetic energy to potential energy while guiding the flow from turbine exit plane to the downstream condenser. In the steam turbine exhaust system, distorted pressure profile is arisen by the nonaxisymmetric collector structure at the diffuser outlet, and this distorted pressure is propagated to the last stage LP turbine exit plane through the diffuser, then the last stage LP turbine experiences asymmetric back pressure. It is known that the pressure recovery performance of diffuser is strongly influenced by diffuser inflow condition. In this study, the effect of exhaust system due to the changing of inlet flow condition is observed by using CFD, and the interaction of last stage LP turbine and exhaust system is investigated by using actuator disk model as modeling of turbine blade row of exhaust hood inlet.

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