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P. Colonna, S. Rebay, J. Harinck and A. Guardone (4) were optimized for siloxanes to perform the thermodynamic optimization of ORCs15 and their parameters were recently refined.16 Parameters for SW-type EoS (5) for siloxanes were also recently optimized16 and specific results regarding MDM will soon be reported in the open literature. For the PIG EoS model (1), a constant ratio of specific heats of γ = 1.0173346 is adopted, which is calculated from the isobaric and isochoric ideal gas specific heats evaluated at the critical temperature, as it is close to the total inlet temperature (cf. Table 1). It should be noted that the Euler solver used in this work permits to investigate the main inviscid features of the flow field through the stator passage, which are the focus of this paper. Viscous phenomena such as boundary layers and a turbulent wake, which are present in the real flow field, can not be taken into account. All flow solutions have converged up to at least six orders of magnitude measured in the L2-norm of all the conserved variables. 3.1 Grid convergence study The periodic grid is generated in a transformed domain, in which periodic boundaries are mapped into internal curves to simplify the task of obtaining periodic nodes.17 In the transformed space the grid is generated by the front-advancing/Delaunay method18 and then transformed back into the physical space of XY -coordinates by introducing a suitable cut, which translates into the saw-like edge of the periodic boundaries shown in Fig. 1(a). It is noted that in Fig. 1(a) the aspect ratio is distorted, because the turbine design is confidential property of the manufacturer. (a) (b) Figure 1: (a) Coarse grid. The figure aspect ratio is distorted, since the turbine design is confidential property of the manufacturer. (b) Mach number distribution on the fine grid ( ), the medium grid ( ) and the coarse grid ( ). 7 2 1.5 1 0.5 Ma 0 0.5 1 S/CPDF Image | REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS
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