A comparison of axial turbine loss models for air, sCO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e3771" altimg="si141.svg"><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> and ORC turbines across a range of scales

Loss models are used to evaluate the aerodynamic performance of axial turbines at preliminary design stage. The commonly loss were derived for air and steam have not been sufficiently investigated working with non-conventional fluids, relevant new power systems, such as organic fluids supercritical CO2 (sCO2). Thus, aim this study is explore deviation between predictions different models, namely Dunham Came, Kacker Okapuu, Craig Cox Aungier, where may differ in operation than conventional or turbines. Additionally, paper aims investigate effect turbine scale on trends these models. Three case-studies defined air, Rankine cycle (ORC) sCO2 each one evaluated two scales. It found that selected resulted varying predictions; particularly predicting losses due clearance gap all small designs. Furthermore, large variations flow regime