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CHAPTER 6: Three-Dimensional CFD Optimization of the Dual-Stage Organic RIT A total of twenty design parameters were specified for the rotor in each stage in order to control the blade angle and thickness distributions and the shape of the meridional channel both at the hub and shroud. For each stage the optimization was conducted at the design operating conditions shown in Table 5-9. The turbine isentropic efficiency defined by Equation 3-34 was specified as the objective function for the GA to be maximized in both stages. Two constraints as the mass flow rate and power output were defined during the optimization. The former to avoid excessive over-prediction compared to the design value while the latter to ensure that RIT delivers the minimum required power at the design point. πΆπππ π‘πππππ‘1 = |πΜ πππππ’π‘ππ β πΜ πππ πππ| β π₯πΜ < 0 Equation 6-4 πΆπππ π‘πππππ‘2 = |πππ€πππππππ’π‘ππ β πππ€πππππ πππ| β π₯πππ€ππ < 0 Equation 6-5 6.4. Baseline geometry generation of the dual-stage organic RIT Prior to the optimization, it was required to create the initial 3-D geometry of the nozzle and rotor for each stage (called baseline design onward) based on the mean-line modelling optimization results summarized in Table 5-10. The nozzle geometry was kept fixed and only the rotor geometry was optimized for both stages. Figures Figure 6-5 and 6-6 present the baseline geometry of nozzle and rotor for stage one and two respectively. Due to the use of volute, the nozzle in the first stage was un-cambered to obtain the correct incidence angle while for the second stage it was created as cambered vane as it is followed by the return channel. 225 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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