A Study of the Three-Dimensional Unsteady Real-Gas Flows Within a Transonic ORC Turbine

A Study of the Three-Dimensional Unsteady Real-Gas Flows Within a Transonic ORC Turbine
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DOI：
10.1115/gt2014-25475
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发表时间：
2014-06
期刊：
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影响因子：
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通讯作者：
Andrew P. S. Wheeler;J. Ong
Andrew P. S. Wheeler;J. Ong
中科院分区：
其他
文献类型：
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作者：
Andrew P. S. Wheeler;J. Ong

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本文研究了有机朗肯循环（ORC）涡轮机内的三维非定常真实气体流动。采用包含真实气体效应的RANS解算器模拟了在超音速导叶出口流（M = 1.4）下运行的径向入流涡轮机级。稳态CFD模拟表明，由于转子中超音速流的发展，诱导轮形状的微小变化会对涡轮机效率产生显著影响。非定常预测显示出与定常CFD相同的趋势，但是叶片后缘激波和转子前缘之间的强烈相互作用导致效率显著下降。Copyright © 2014 by ASME
In this paper we investigate the three-dimensional unsteady real-gas flows which occur within Organic Rankine Cycle (ORC) turbines. A radial-inflow turbine stage operating with supersonic vane exit flows (M ≈ 1.4) is simulated using a RANS solver which includes real-gas effects. Steady CFD simulations show that small changes in the inducer shape can have a significant effect on turbine efficiency due to the development of supersonic flows in the rotor. Unsteady predictions show the same trends as the steady CFD, however a strong interaction between the vane trailing-edge shocks and rotor leading-edge leads to a significant drop in efficiency.Copyright © 2014 by ASME