SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC

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SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC ( small-scale-radial-inflow-turbine-for-whr-orc )

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CHAPTER 6: Three-Dimensional CFD Optimization of the Dual-Stage Organic RIT manufacturing limitation such value is not feasible, therefore the volute tongue was created at θ=345° and the area was kept fixed to θ=360°. Figure 6-26 Volute 3-D geometry Due to the complexity of the volute geometry, especially at the tongue, tetrahedron elements were employed to create the volute mesh using ANSYSR15 meshing. The mesh independence study for achieving minimum total pressure drop variation and also uniform flow angle at the volute exit resulted in 1130415 elements as depicted in Figure 6-27. The CFD setup for the volute was similar to section 6.5 except for the boundary conditions. The inlet total temperature and pressure of stage one organic RIT (refer to Table 5-9) was specified at the volute inlet while the mass flow rate was set at the volute outlet as the outlet static pressure was unknown. Figure 6-28 presents the CFD setup for the volute. The results of CFD analysis are depicted in Figure 6-29. As it is clear, the volute provides a very uniform and smooth flow around its periphery without any flow reversal. The flow velocity was low as expected in majority of the volute volume except for the region near the tongue where it was accelerated due to considerably small cross sectional area. 249 | P a g e

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