The effect of dense gas dynamics on loss in ORC transonic turbines

The effect of dense gas dynamics on loss in ORC transonic turbines
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稠密气体动力学对 ORC 跨音速涡轮机损失的影响

DOI:
10.1088/1742-6596/821/1/012021
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发表时间:
2017
期刊:
Conference Series
影响因子:
--
通讯作者:
Durá Galiana F
Durá Galiana F
中科院分区:
--
文献类型:
--
作者:
Durá Galiana F

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本文介绍了近期关于稠密气体动力学对 ORC 跨音速涡轮机性能影响的多项研究。我们描述了实验、分析和计算研究的结合,这些研究用于确定后缘损耗如何随工作流体的选择而变化。路德维格管瞬态风洞用于模拟超音速基流,模拟 ORC 涡轮叶片后缘流。使用不同工作流体对尾流轮廓和后缘基础压力进行实验测量,用于验证高阶 CFD 模拟。为了捕获基区中的正确混合,通过比较具有不同空间和时间分辨率的 LES,执行大涡模拟 (LES) 并根据实验数据进行验证。 RANS 和分离涡模拟 (DES) 也与实验数据进行了比较。然后确定不同建模方法和工作流体对混合损失的影响。目前的结果表明 LES 预测与实验结果最接近,并且一致预测稠密气体效应会增加损失。
This paper describes a number of recent investigations into the effect of dense gas dynamics on ORC transonic turbine performance. We describe a combination of experimental, analytical and computational studies which are used to determine how, in-particular, trailing-edge loss changes with choice of working fluid. A Ludwieg tube transient wind-tunnel is used to simulate a supersonic base flow which mimics an ORC turbine vane trailing-edge flow. Experimental measurements of wake profiles and trailing-edge base pressure with different working fluids are used to validate high-order CFD simulations. In order to capture the correct mixing in the base region, Large-Eddy Simulations (LES) are performed and verified against the experimental data by comparing the LES with different spatial and temporal resolutions. RANS and Detached-Eddy Simulation (DES) are also compared with experimental data. The effect of different modelling methods and working fluid on mixed-out loss is then determined. Current results point at LES predicting the closest agreement with experimental results, and dense gas effects are consistently predicted to increase loss.
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