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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) 3.5.5. Parametric studies and selection of the candidate turbine The developed mean-line code was employed to perform parametric studies in order to investigate the effect of input variables on the turbine critical performance parameters (i.e. power and efficiency) and turbine size (i.e. rotor inlet diameter). Such parametric studies are based on simultaneous variation of two input parameters in a defined range (with other inputs kept constant) and plotting their effects on the performance parameters mentioned above. Such plots are then examined to determine the values of these two parameters that give the best performance. Such values will be fixed in the next run where two other variables will be changed and this process will be repeated until the best values will be identified for all the input parameters. The mean-line code input parameters and their variation ranges are shown in Table 3-1. The results of the parametric studies are presented in Figure 3-9 to 3.13. Table 3-1 Mean-line code input parameters and their range Parameter Unit Operating parameters Inlet total temperature (Tt,1) K Inlet total pressure (Pt,1) kPa Expansion ratio (ERts) (-) Mass flow rate (𝑚̇ ) kg/s Turbine design parameters Velocity ratio (νts) (-) Rotational speed (ω) rpm Rotor inlet absolute flow angle (α4) degree Rotor exit absolute flow angle (α5) degree Rotor exit hub to inlet radii ratio (-) (r5,hub/r4) Rotor exit tip to inlet radii ratio (r5,tip/r4) (-) Range 323 - 473 150 - 400 1.5-3 2 0.03 - 0.1 0.09 0.6 - 0.9 0.68 Selected value 40000 - 60000 60 - 80 78.6 -10 - 10 0 0.15 - 0.45 0.2 0.5 - 0.8 0.55 323 200 55000 Power, stage total-to-static efficiency and rotor diameter were plotted versus inlet total pressure (Pt,1) at various inlet total temperature (Tt,1) as shown in Figure 3-9. It is clear from Figure 3-9(a) and (c) that the effect of Tt,1 is more significant on the power output and the rotor inlet diameter than Pt,1. 75 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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