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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Start Input Read mean-line input/output data 1-Operating conditions 2-Inlet and exit blade angles 3-Inlet and exit radii 4-Inlet and exit blade heights End Yes Satisfactory performance? No The obtained fluid pressure distribution across the blade surface area together with the blade rotational speed are imported from the ANSYSR15 CFX to ANSYSR15 Mechanical to conduct FEA and assess the mechanical integrity of rotor blade in terms of stress and displacement and if unsatisfactory, this procedure will be repeated by updating the blade geometry. It should be noted that the mean-line modelling still remains as a key part of the proposed approach since it can converge as closely as possible to an optimum configuration (Figure 3-4). If this stage is not accomplished effectively, long time may be spent by making trial CFD and FE analyses that are far from the optimum design. Hence, a combination of both approaches was utilized for effective design of the RIT. 3.6.2. 3-D CAD modelling of rotor and nozzle geometries By employing the BladeGen software three-dimensional geometry of the nozzle and rotor blades are created using pressure/suction and angle/thickness modes respectively. Apart from the mean-line data (Table 3-2) that define the meridional blade profile, it is required to set the blade angle and thickness distribution between the rotor inlet and exit and the stagger and metal wedge angles and the throat area for the nozzle. Figure 3-15 Blade 3D geometry generation (ANSYS BladeGen) Grid generation (ANSYS TurboGrid) CFD & FEA Analyses (ANSYS CFX & Mechanical) 1- Blade angles 2-Blade thickness 3-Number of blades 4-Blade angle distribution 1-Topology generation 2- Mesh resolution 3-Boundary layer resolution (Yplus) Figure 3-14 Schematic diagram of the detailed phase (CFD & FEA) 1- Pre-processing 2- Solver setting 3-Post-processing Updating Design 86 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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