The effect of dense gas dynamics on loss in ORC transonic turbines
Durá Galiana, FJ
Journal of Physics : Conference Series
Institute of Physics (IoP)
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Durá Galiana, F., Wheeler, A., Ong, J., & Ventura, C. (2017). The effect of dense gas dynamics on loss in ORC transonic turbines. Journal of Physics : Conference Series, 821 (012021)https://doi.org/10.1088/1742-6596/821/1/012021
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.
Project supported by the EPSRC (EP/J006394/1, EP/L027437/1) and GE Global Research.
External DOI: https://doi.org/10.1088/1742-6596/821/1/012021
This record's URL: https://www.repository.cam.ac.uk/handle/1810/266744
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