Great to see the latest paper from one of our PhD students in our group that I co-supervise published after a long publishing journey! A nice paper exploring the resulting differences when different loss models are applied to the design of axial turbines operating with different working fluids.

Download the open-access article for free here.

A comparison of axial turbine loss models for air, sCO2 and ORC turbines across a range of scales

Loss models are used to evaluate the aerodynamic performance of axial turbines at the preliminary design stage. The commonly used loss models were derived for air and steam turbines and have not been sufficiently investigated for turbines working with non-conventional working fluids, relevant to new power systems, such as organic fluids and supercritical CO (sCO2). Thus, the aim of this study is to explore the deviation between the performance predictions of different loss models, namely Dunham and Came, Kacker and Okapuu, Craig and Cox and Aungier, for non-conventional working fluids where turbines may differ in design and operation than conventional air or steam turbines. Additionally, this paper aims to investigate the effect of the turbine scale on the trends in the performance predictions of these models. Three different case-studies are defined for air, organic Rankine cycle (ORC) and sCOO2 turbines and each one is evaluated at two different scales. It is found that the selected loss models resulted in varying loss predictions; particularly for predicting the losses due to the clearance gap for all small scale designs. Furthermore, large variations were found in predicting the effect of the flow regime on the turbine performance for all models.

Acknowledgement

The SCARABEUS project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 814985.