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Influence of aerodynamic characteristics optimization of exhaust passage on heat transfer of condenser in steam turbine

机译：排气道空气动力学特性优化对汽轮机冷凝器传热的影响

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In the previous research, static pressure recovery coefficient (SPRC) and total pressure loss coefficient (TPLC) were used to evaluate the aerodynamic characteristics of exhaust passage of steam turbine. In this paper, the heat transfer performances of condenser are used to evaluate the aerodynamic characteristics of exhaust passage. The aerodynamic characteristics of exhaust passage are optimized through installing guide devices considering the influence of the whole last stage. The computational fluid dynamics software is applied to numerically solve N-S equation and k-epsilon equation in three dimensions. Then the flow field and the heat transfer performances of condenser were simulated, which using porous medium model and UDF condensation program. The results show that the heat transfer performances of condenser are improved obviously after the flow field of exhaust passage is optimized. The heat transfer coefficient of condenser increases by about 37.5% and the vacuum (VAC) increases by about 0.9 kPa. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在以前的研究中，静压力恢复系数（SPRC）和总压力损失系数（TPLC）被用于评估汽轮机排气通道的空气动力特性。本文利用冷凝器的传热性能评估排气通道的空气动力学特性。考虑到整个最后阶段的影响，可通过安装导向装置来优化排气通道的空气动力学特性。运用计算流体力学软件对三维NS方程和kε方程进行三维数值求解。然后利用多孔介质模型和UDF冷凝程序模拟了冷凝器的流场和传热性能。结果表明，优化排气通道的流场后，冷凝器的传热性能得到明显改善。冷凝器的传热系数增加约37.5％，而真空（VAC）则增加约0.9 kPa。 （C）2019 Elsevier Ltd.保留所有权利。

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