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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) the aforementioned material are summarized in Table 3-6 and was used for the FEA. The maximum tolerable temperature for such material is about 50 ̊C before deformation as it is specified by the glass transition temperature. Table 3-6 Material properties of Objet FullCure 720TM Parameter Tensile strength (MPa) Modulus of elasticity (MPa) Flexural strength (MPa) Flexural modulus (MPa) Density (kg/m3) Poisson’s ratio (-) Glass transition temperature (°C) Manufacturer values 60 2870 76 1718 1185 0.27 50 3.6.4.2. FEA modelling strategy, grid generation and setup The final rotor blade 3-D geometry defined by the CFD studies in section 3.6.3 was investigated further to assess its mechanical integrity using FEA. The FE analyses involved investigation of the blade stress and displacement under both the fluid pressure on the blade surface and also centrifugal forces due to the rotational speed. Since the rotor is the critical component amongst all, FEA are merely conducted for this part. All the FEA simulations were performed with ANSYSR15 Mechanical, part of the ANSYSR15 workbench to ease the transfer of information between the CFD and FEA modules. The objet FullCure720TM material properties (Table 3-6) were defined in ANSYSR15 Mechanical and assigned to the rotor blade. The rotor blade hub surface was specified as a fixed support (Figure 3-47) for both FEA due to the fluid pressure and due to the rotational speed. For the former, the blade surface was selected and the imported pressure from the CFD simulation was applied to it. For the latter the rotation axis was defined based on the rotor configuration and the design speed (55000rpm) and direction were assigned to it (Figure 3-47). 115 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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