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CHAPTER 3: Methodology for Developing Radial Inflow Turbine (RIT) Figure 3-31 Absolute flow velocity at the rotor outlet for the original and modified profile "Dā 3.6.3.5. Effect of rotor blade number The minimum number of rotor blades is a critical parameter that affects the performance, blade loading and the rotating inertia of the turbine. Despite a number of empirical correlations such as the one shown in Equation 3-26, accurate estimation of the minimum number of rotor blades that leads to best performance can be reliably obtained with CFD analysis. The flow field behaviour, blade loading and the global performance parameters were examined for different number of rotor blades (Zrotor) to select the appropriate value. Profile āDā with modified thickness and LE shape (section 3.6.3.4) was investigated with lower number of blades as Zrotor =11, Zrotor =13 and Zrotor =15 compared to the original value of Zrotor=16. Figure 3-32 to 3.35 show the blade loading and Mach number distribution contour plots at half span for rotor blade numbers 11, 13, 15 and 16 respectively. As it is evident from the results, there is an optimum number of blades with the maximum efficiency of 84.54% obtained with Zrotor=15, though the results for the other cases were also competitive. 103 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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