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3.2. Compressor Norman Holaind et al. / Energy Procedia 123 (2017) 313–320 319 Norman Holaind et al./ Energy Procedia 00 (2017) 000–000 7 Since the outlet pressure in a compressor is higher than the inlet pressure, the pressure should not be imposed at both the outlet and the inlet like for the turbine. Therefore, for stability reasons the static pressure is imposed at the outlet, and the mass flow is imposed at the inlet. The pressure ratio is an output of the simulation not an input, allowing it to be established during the simulation and limiting reversed flows. Similar to the turbine, this simulation is also split into two different domains, the first is composed of the wheel which has been designed to give the energy to the fluid and the second one which is composed of the diffuser and the volute, which are designed to limit flow rotation and increase the pressure [15]. As shown in Fig. 4, the simulation confirms that the chosen design for the compressor gives the required pressure ratio for the nominal rotational speed. For this design, the predicted compressor efficiency is 76%. (a) beige – mass flow rate inlet, orange – pressure outlet, grey – wall (b) streamlines (c) pressure field (d) absolute velocity field Fig. 4. Compressor CFD design: (a) boundary conditions, (b-d) results 4. Conclusions The paper presented theoretical and CFD studies on the turbomachinery design for small scale supercritical CO2 systems. With reference to a simple regenerative Brayton cycle layout, thermodynamic modelling and parametricPDF Image | Design of Radial Turbomachinery for S CO2 CFD
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