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CHAPTER 6: Three-Dimensional CFD Optimization of the Dual-Stage Organic RIT Evidently, the formation of the secondary flows in the blade-to-blade plane has been propagated to the meridional plane of the baseline designs at various spans as illustrated in Figures Figure 6-18 and 6.19. The entropy generation has occupied majority of the meridional channel of the baseline designs with greater intensity in stage one compared to stage two. Such phenomena has been amplified further by the rotor tip leakage flow travelling away from the SS and mixed out with the secondary flows and hence increased the entropy generation even more. In contrast, for the optimized geometries the intensity of the entropy generation and losses has been relaxed and only accumulated near the rotor tip region. Apparently, the optimizer was unable to further improve the meridional passage to completely remove the entropy generation as it was not possible due to the requirement of the running clearance between the blade and casing and inevitable tip leakage flows and consequent losses. Mach number contours in the meridional channel for the baseline and optimized designs for both stage one and two are presented in FiguresFigure 6-20 and 6.21 respectively. As it is evident, the highest Mach number is obtained at the interspace between nozzle and rotor in all cases. Although from mean-line modelling it was assured to avoid Mach numbers in excess of unity, due to the inclusion of the interspace and its detailed design through CFD (slight variation in its length) the Mach number is slightly higher than unity. But such feature has no significant effect on the performance of the turbine as was shown previously from the optimization results. The final three-dimensional geometry of the optimized rotors and their corresponding nozzle rings are shown in Figure 6-22 for both stages. 241 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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