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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Figure 3-35 Blade loading (left) and Mach number (right) for Zrotor =16 The case with Zrotor=11 suffered from strong secondary flow and flow separation on the suction surface (SS) starting from downstream of the LE and propagating to about 65% of the stream-wise passage length. Such effect is clearly visible from the blade loading chart (Figure 3.32) with excessive diffusion levels and almost negative loading. For the other cases there is no evidence of negative loading. Since the aim of the rotor blade is to increase the relative Mach number as close as possible to the design value, both cases with Zrotor =11 and 13 are unable to accelerate the flow relative velocity and therefore the relative Mach number to as high as 0.417 (Table 3-2) compared to Zrotor =15 and 16. As can be seen from Figures Figure 3-34 and 3.35, a major part of the rotor passage near the trailing edge (TE) is occupied with Mach number contour of about 0.4 compared to the two other cases. Since the maximum efficiency is obtained by Zrotor=15 and it provided smooth expansion on both SS and PS with uniform velocity vectors and even slightly larger power output compared to Zrotor =16, such value was selected. Moreover, Zrotor =15 assures that the number of rotor and nozzle blades are odd and even respectively in order to avoid the possible resonances due to the blades interaction. It is clear from the above results that, CFD analysis can be used to predict a more realistic 105 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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