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318 Norman Holaind et al. / Energy Procedia 123 (2017) 313–320 6 Norman Holaind et al./ Energy Procedia 00 (2017) 000–000 appropriate. The Peng-Robinson equation which has been shown to offer good accuracy near the critical point was employed. 3.1. Turbine The simulation is split in two different domains; the first one is composed of the volute and diffuser which are designed to distribute the flow into the wheel. They have been optimized in a way that half of the expansion takes place in them. The second domain is composed of the wheel which is designed to convert the energy of the expansion into mechanical energy [14]. This domain is considered as a rotating reference and both centrifugal and Coriolis forces are included in the simulations. Since the velocity of the flow is subsonic at the interface between the two domains, a mixing plane interface is used. As the efficiency of a Turbine for compressible flow is dependent on the pressure ratio, the pressure is imposed at both the inlet and outlet of the domain. As shown in Fig. 3, the simulation confirms that the chosen design of the Turbine allows for the expansion to happen half in the diffusor and half in the wheel, minimizing the pressure drop in the volute and allowing pressure to power conversion in the wheel. The simulation shows efficiency of the turbine in the region of 70% at the nominal point. (a) purple – stagnation inlet, orange – pressure outlet, grey – wall (b) streamlines (c) pressure field (d) absolute velocity field Fig. 3. Turbine CFD design: (a) boundary conditions, (b)-(d) resultsPDF Image | Design of Radial Turbomachinery for S CO2 CFD
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