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首页> 外文会议>ASME Turbine Technical Conference and Exposition >FLOW INTERACTIONS BETWEEN SHROUDED POWER TURBINE AND NONAXISYMMETRIC EXHAUST VOLUTE FOR MARINE GAS TURBINES
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FLOW INTERACTIONS BETWEEN SHROUDED POWER TURBINE AND NONAXISYMMETRIC EXHAUST VOLUTE FOR MARINE GAS TURBINES

机译：海洋燃气轮机罩罩动力涡轮机与非共振排气蜗壳的流动相互作用

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The marine gas turbine exhaust volute is an important component that connects a power turbine and an exhaust system, and it is of great importance to the overall performance of the gas turbine. Gases exhausted from the power turbine are expanded and deflected 90 degrees in the exhaust volute, and then discharge radially into the exhaust system. The flows in the power turbine and the nonaxisymmetric exhaust volute are closely coupled and inherently unsteady. The flow interactions between the power turbine and the exhaust volute have a significant influence on the shrouded rotor blade aerodynamic forces. However, the interactions have not been taken into account properly in current power turbine design approaches. The present study aims to investigate the flow interactions between the last stage of a shrouded power turbine and the nonaxisymmetric exhaust volute with struts. Special attention is given to the coupled aerodynamics and pressure response studies. This work was carried out using coupled computational fluid dynamics (CFD) simulations with the computational domain including a stator vane, 76 shrouded rotor blades, 9 struts and an exhaust volute. Three-dimensional (3D) unsteady and steady Reynolds-averaged Navier-Stokes (RANS) solutions in conjunction with a Spalart-Allmaras turbulence model are utilized to investigate the aerodynamic characteristics of shrouded rotors and an exhaust volute using a commercial CFD software ANSYS Fluent 14.0. The asymmetric flow fields are analyzed in detail; as are the unsteady pressures on the shrouded rotor blade. In addition, the unsteady total pressures at the volute outlet is also analyzed without consideration of the upstream turbine effects. Results show that the flows in the nonaxisymmetric exhaust volute are inherently unsteady; for the studied turbine-exhaust configuration the nonaxisymmetric back-pressure induced by the downstream volute leads to the local flow varying for each shrouded blade and low frequency fluctuations in the blade force. Detailed results from this investigation are presented and discussed in this paper.
机译：海洋燃气轮机排气蜗壳是连接动力涡轮机和排气系统的重要组成部分，并且对于燃气轮机的整体性能非常重要。从动力涡轮机排出的气体在排气蜗壳中膨胀并偏转90度，然后径向排出到排气系统中。动力涡轮机中的流动和非共振排气速度紧密耦合，本身不稳定。动力涡轮机和排气蜗壳之间的流动相互作用对罩转子叶片空气动力具有显着影响。但是，在当前的发电机涡轮机设计方法中尚未考虑相互作用。本研究旨在研究笼罩的动力涡轮机的最后阶段与带支柱的非共振排气蜗壳之间的流动相互作用。特别注意耦合的空气动力学和压力响应研究。这项工作进行了使用耦合计算流体动力学（CFD）模拟与包括定子叶片，76个笼罩转子叶片9米的支柱和排气蜗壳计算域。利用了与Spalart-Allmaras湍流模型结合使用的三维（3D）不稳定和稳定的雷诺瓦尔平均 - 平均Navier-Stokes（RANS）解决方案，用于研究使用商业CFD软件ANSYS FLUENT 14.0的商业CFD软件ANSYS的笼罩转子和排气蜗壳的空气动力学特性。详细分析非对称流场;由于笼罩的转子叶片上的不稳定压力是。此外，还分析了蜗壳出口处的不稳定总压力而不考虑上游涡轮机效应。结果表明，非开缩排气蜗壳中的流动本质上是不稳定的;对于所研究的涡轮 - 排气构造，下游蜗壳引起的非共激反应导致局部流动，对于每个罩叶片和叶片力中的低频波动。本文提出和讨论了这篇调查的详细结果。

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