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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Figure 3-37 presents the 3-D velocity streamlines within the nozzle and rotor passages and illustrates the smooth velocity as well as the tip leakage flow. Additionally, Figure 3-38 illustrates the final 3-D geometry of the rotor and nozzle imported into a CAD package. For this final configuration the key results from the mean-line model were compared against the CFD results as summarized in Table 3-5 where the stage efficiency increased from 81.3% to 84.54% by improving the flow dynamics of the turbine. As can be seen from the Table 3-5, majority of the results are in close proximity when comparing the mean-line with CFD. This confirms that the developed mean-line model can fairly accurately predict the turbine performance and flow features of small-scale RITs and it can provide reliable results in the absence of CFD simulation. Table 3-5 Comparison of the mean-line model and CFD results for the final rotor geometry Parameter Tt,4 (K) Pt,4 (kPa) T4 (K) P4 (kPa) C4 (m/s) W4 (m/s) α4 (degree) β4 (degree) Ma4 (-) Tt,5 (K) Pt,5 (kPa) T5 (K) P5 (kPa) C5 (m/s) W5,RMS (m/s) α5 (degree) β5,RMS (degree) Ma5,rel (-) 𝑚̇ (kg/s) Power (kW) 𝜂𝑠𝑡𝑎𝑔𝑒,𝑡𝑠 (%) Mean-line model 323 194.12 301.4 152.38 199.1 -49.82 78.6 -39.61 0.599 275.9 102.21 274.2 100 58.7 -140.6 0 -60.62 0.417 0.09 4.152 81.3 CFD 322.89 192.7 298.11 145.18 223.9 -47.26 78.906 -20.74 0.658 273.92 102.13 272.16 100 56.42 102.64 13.63 -57.55 0.398 0.0887 4.363 84.54 108 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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