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3.2 CFD RESULTS: As mentioned previously the CFD has been done using ANSYS. The computational domain for the radial turbine consists of one stator vane and one rotor blade. Structured meshes were generated using ANSYS TurboGrid. To ensure mesh independence, a grid independence study has been performed. Three different parameters (mass flow rate, turbine total to total efficiency and) were calculated from CFD. Six grids of increasing refinement have been used to calculate theses parameters, starting with a coarse grid of 20000 elements and ending with a grid of 1366922 elements. Results shows that increasing number of mesh elements will not affect the results starting from 600000 elements distributed between the rotor and stator domains, hence the stator passage required ~ 250,000 elements and the rotor passage required ~ 350,000 elements. The total number of elements was 621230 elements. Figure 12 shows the computational domain at ANSYS CFX, the figure shows the surface grid for the computational domain. Coarser mesh is presented for better visualisation. Figure 12: Surface grid for the computational domain. The numerical calculations were performed using ANSYS CFX. The boundary conditions used for the design are listed in table 5: Table 5: boundary conditions used in CFD calculations. Total temperature at domain inlet (Kelvin) Total pressure at domain inlet (bar) Flow angle at domain inlet (degree) Rotational speed (rpm) Exit static pressure (bar) 1073 2.919 0 (Radial direction) 130,000 1.033 13PDF Image | Optimised Radial Turbine Design D1.8
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