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CHAPTER 6: Three-Dimensional CFD Optimization of the Dual-Stage Organic RIT Such Meta-model was employed by the GA to optimize the efficiency of each stage separately by variation of the blade geometry. The optimization results showed that the efficiencies of stage one and stage two were increased by 9.2% and 10.5% respectively compared to the baseline designs. Such improvements were explained by comparing the rotor flow field for both stages in terms of velocity vectors and entropy distribution both in blade-to-blade and meridional planes. In addition, off-design CFD simulations of each stage were conducted individually to investigate their performance at various rotational speeds and expansion ratios which can be used for performance estimation of the ORC systems that are mostly operating at off-design conditions (especially those that the heat source is supplied by renewables). The volute and return channel were designed and simulated using CFD to assure high aerodynamic performance with minimal losses. Eventually, the CFD analysis of the complete dual-stage organic RIT including the volute, nozzles and rotors in both stages and return channel were carried out both at the design point and many off-design points with the maximum relative improvement of 10.46% in the cycle thermal efficiency at the design point. Such results provide a reliable estimation of the developed organic RIT performance under various operating conditions and can be integrated with the ORC analysis code to determine the cycle thermal efficiency at various off-design conditions. 264 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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