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Performance evaluation of a Terry GS-2 steam impulse turbine with air-water mixtures
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2021-02-18 , DOI: 10.1016/j.applthermaleng.2021.116636
Joshua Vandervort , Gavin Lukasik , Burak Ayyildiz , Matthew Solom , Adolfo Delgado , Karen Vierow Kirkland , Abhay Patil

Terry steam turbines are widely used in various industries because of their robust design. Within the nuclear power generation industry, they are used in the Reactor Core Isolation Cooling System to remove decay heat during reactor isolation events. During the Fukushima Daiichi nuclear power station disaster in Japan in 2011, the Reactor Core Isolation Cooling System and associated Terry turbine operated for over 70 hours in Unit 2; this runtime is well beyond the expected operating duration. Theories suggest the turbine was subjected to a two-phase inlet flow, which could degrade the turbine performance. In this work, an experimental test rig was constructed to test a full-scale Terry model GS-2 steam turbine under two-phase air/water flows. Steady-state efficiency and torque performance maps of the turbine were developed over a range of turbine inlet pressures (1.38–4.83 bar or 20–70 psia), air mass fractions (0.05–1.0) and rotational speeds up to 4000 RPM. Turbine performance followed expected trends with torque varying linearly and efficiency varying quadratically with rotational speed. In addition, high-speed images of the two-phase flow entering the turbine were also analyzed to understand how changes in inlet pressure and air mass fraction affect the flow regime and homogenization. The present tests with air–water two-phase mixtures are an important step towards providing an understanding of the full-scale Terry turbine’s behavior and performance curves under two-phase conditions. The results of this work will be combined with air/water and steam/water data gathered using a small-scale Terry ZS-1 steam turbine in order to understand the scaling relationship between large and small size Terry turbines and fluid pairs. The combined data set will enable further development of analytical models over a wide range of conditions and may be used to provide technical justification for expanded use of the Terry turbines in nuclear power plant safety systems and other systems.



中文翻译:

带有空气-水混合物的Terry GS-2蒸汽脉冲涡轮的性能评估

特里蒸汽轮机由于其坚固的设计而被广泛用于各种行业。在核能发电行业中,它们被用于反应堆堆芯隔离冷却系统中,以消除反应堆隔离事件期间的衰变热。在2011年日本福岛第一核电站灾难期间,反应堆堆芯隔离冷却系统和相关的Terry涡轮机在2号机组中运行了70多个小时;该运行时间远远超出了预期的运行时间。理论表明,涡轮机受到两相进气流的影响,这可能会降低涡轮机的性能。在这项工作中,建造了一个实验测试台,以在两相空气/水流下测试全尺寸的Terry GS-2型蒸汽轮机。涡轮的稳态效率和扭矩性能图是在一系列涡轮入口压力(1.38–4.83 bar或20–70 psia),空气质量分数(0.05–1.0)和转速高达4000 RPM的范围内绘制的。涡轮机性能遵循预期趋势,扭矩随转速线性变化,效率随转速呈二次方变化。此外,还对进入涡轮机的两相流的高速图像进行了分析,以了解入口压力和空气质量分数的变化如何影响流态和均质化。当前的空气-水两相混合物测试是迈向了解全尺寸Terry涡轮在两相条件下的性能和性能曲线的重要一步。这项工作的结果将与使用小型Terry ZS-1蒸汽轮机收集的空气/水和蒸汽/水数据相结合,以了解大型和小型Terry涡轮机与流体对之间的比例关系。合并的数据集将能够在广泛的条件下进一步开发分析模型,并可用于为在核电厂安全系统和其他系统中扩展使用Terry涡轮机提供技术依据。

更新日期:2021-04-08
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