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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Increasing α4 results in larger absolute circumferential velocity at rotor inlet (Cθ,4) as shown in Figure 3-6 and based on Equation 3-19 it enhances the actual enthalpy drop and consequently power and efficiency (with fixed expansion ratio and isentropic enthalpy drop). Figure 3-13 presents the variation of the rotor radii ratios and it is only the stage efficiency that is noticeably affected by such variation. With fixed r5,hub/r4 ratio, increasing r5,tip/r4 results in larger flow area at rotor exit (A5) based on Equation 3-15 and according to the conservation of mass, the exit flow absolute velocity (C5) is reduced resulting in smaller exit kinetic losses and consequently increases the efficiency. However, at the same time increasing r5,tip/r4, increases the secondary losses (Equation 3-44) and the combination of these two effects offset the increase in efficiency curve at high r5,tip/r4 values. Based on the above parametric studies the best values for all of the investigated input parameters are selected and summarized in Table 3-1. Table 3-2 shows the mean-line modelling results obtained by running the code using the selected values of Table 3-1. As can be seen from the performance parameter results the values of the Ns, ds, φ and ψ are in the favouring operating region of the RIT based on Figure 3-1 and underlines the rationale selection of this configuration of turbomachinery in this chapter. Although this approach is effective for systematic investigation of the key input parameters, it strongly depends on the experience and doesn’t necessarily assure that the optimum combination of the inputs is achieved. Moreover, outputs are required to be manually checked against the application and geometrical constraints. These deficiencies have been addressed in chapter five in which the mean-line code has been integrated with an optimization method to perform true analytical optimization of the performance subjected to various constraints. 83 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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