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RIFTUD [5] was used as a reference test case considering the Argon turbine, moreover, it was also used in the case of the T-100 turbine in order to validate the RTGD tool. The NASA RIFTUD [5] code turbine design is implemented in Fortran language. RIFTUD requires a detailed input related to the geometry of both rotor and stator, therefore it is more suitable for the improvement of a real turbine. This code is difficult to use in the case of a radial turbine preliminary design, as it requires 26 input parameters, some of which are not available, since are related to the turbine geometry. Real Case Comparison Between RTGD and RIFTUD This section shows the results of the RTGD tool and RIFTUD code, compared with the real T-100 turbine [9]. The results show that RTGD slightly overestimates the turbine geometry, it can be observed that outlet hub and shroud radius are about 10% higher compared to the design parameters. While, considering the efficiency calculation has been predicted with the maximum precision. In the case of the RIFTUD code the turbine overall dimensions were found very similar to the real case results. Several attempts were necessary, as the code requires the input of both inlet and outlet stator flow angles, as well as of different diameters ratio: - Stator Inlet/Rotor Inlet; - Stator Exit/Rotor Inlet; - Rotor Exit Shroud/Rotor Inlet; - Rotor Exit Hub/Rotor Exit Shroud. TABLE 2. Comparison RTGD and RIFTUD with Real Case Inlet Radius [m] Inlet Blade Height [m] Inlet Absolute Flow Angle [°] Inlet Relative Flow Angle [°] Number Blades Outlet Hub Radius [°] Outlet Shroud Radius [°] Outlet Blade Height [m] Outlet Absolute Flow Angle [°] Outlet Relative Flow Angle [°] Chord [m] Trailing Edge Thickness [m] Total to Static Efficiency Pressure Ratio Loading Coefficient Flow Coefficient T-100 0.0582 0.00635 76.80 -31.80 16 0.0152 0.0368 0.0216 0.03 57.40 0.0457 0.00076 0.86 0.91 RTGD Comparison whit RIFTUD RTGD 0.0557 0.00590 77 -31.67 15 0.0167 0.0410 0.0243 0.00 72.59 0.072 0.0011 0.86 5.69 0.95 0.23 RIFTUD 0.0587 75.93 -31.53 15 0.0153 0.0371 0.0218 0.00 73.79 0.86 5.92 This part illustrations the second test case between RTGD and RIFTUD. The table shows that both the overall turbine geometry that the performances are almost similar. The main differences are in the rotor exit geometry estimation, in particular, RTGD overestimates the outlet hub radius by about 20%, while the outlet shroud radius is about 3% higher. The Table 3 shows the validation of the RTGD tool with the Argon turbine. 020097-7PDF Image | Radial turbine preliminary design and performance prediction
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