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The blade loading was checked to make sure that the flow is not forced to reverse direction near the trailing edge. Figure 17 shows the blade loading through the rotor passage at 50 % span. The red circle is the region where the flow is usually forced to reverse direction because the pressure at suction surface becomes larger than that on the pressure surface. This pressure reversal causes losses in the turbine, so in this design this reversal in the pressure has been avoided. Figure 17: Rotor wheel blades loading chart 3.3 STRUCTURAL ANALYSIS RESULTS: A Finite Element Analysis was conducted in order to assess the stress distribution for the turbine wheel. The FEA was performed using ANSYS Workbench. A static structural analysis was carried out. This is necessary because of the high rotational speed and high flow temperature experienced by the impeller. The alloy Inconel 718 was selected because of its high-quality mechanical properties under extreme temperatures. To ensure safe behaviour under working conditions, the Von Mises yield criterion needs to be satisfied. This criterion states that a material is said to start yielding when its Von Mises stress reaches a critical value known as the Yield strength. The Yield strength is defined as the stress at which a material begins to deform plastically. Inconel 718 0.2% Yield strength for different temperatures is presented in table 7. Table 7: Inconel 718 0.2% Yield strength. Temperature (°C) 93 204 316 427 538 649 760 0.2% Yield strength (MPa) 1172 1124 1096 1076 1069 1027 758 17PDF Image | Optimised Radial Turbine Design D1.8
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