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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Table 3-4 Summary of main performance parameters from CFD analyses of 4 investigated blade profiles Profile A Profile B Profile C Profile D 3.6.3.4. Stage total-to-static efficiency (%) Power (kW) Mass flow rate (kg/s) 82.15 4.366 0.0911 78.58 3.675 0.0801 82.57 4.092 0.085 83.33 4.190 0.0863 Effect of blade thickness and leading edge (LE) profiles Following the results in section 3.6.3.3, the profile “D” was selected in order to further investigate the effect of varying the thickness distribution from hub-to-tip and also the effect of the rotor LE shape. It should be noted that for all the CFD analyses in section 3.6.3.3, the thickness was kept constant with the value of about 2mm from hub-to-tip as illustrated in Figure 3-28 (a). From the aerodynamic point of view, the lower the thickness the better the performance (as will be shown in this section) subject to structural analysis that will be described in section 3.6.4. Therefore, for the modified case the rotor blade hub-to-tip thickness has been reduced linearly from about 2mm near the hub to about 1mm near the blade tip as depicted in Figure 3-28 (b). At the same time, the shape of the rotor blade LE has also changed from a square cut-off shape to a curved elliptical shape. Figure 3-29 shows the two modifications on the original profile “D” in the blade-to-blade view at half span. Conducting the CFD analysis for the modified profile “D” with the same CFD setup and mesh resolution as described in sections 3.6.3.1 and 3.6.3.2, resulted in stage efficiency, power and mass flow rate of 84.51%, 4.343kW and 0.0884kg/s respectively. Apparently the implemented modifications improved the turbine efficiency by about 1.18% while the power was increased by about 153W. 99 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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