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CHAPTER 5: Mean-line Modelling and Optimization of Organic RIT and Integration with Cycle Analysis Programme 5.6.1. Optimization constraints Some of the critical turbine geometry parameters, flow features and ORC properties were constrained during the optimization. These constraints were required to be satisfied simultaneously to ensure high aerodynamic performance, feasibility of the optimized turbine design and high cycle efficiency. α4 < 82o. This value was set to achieve reasonable Zrotor, Equation 3-26, and minimize the associated tip clearance and friction losses (EquationsEquation 3-37 and 3.45). β5,tip > -75o: This value was set to compromise between the rotor exit kinetic loss and the rotor passage loss (summation of secondary and friction losses) (Baines 2003) and manufacturing limitations. β4,blade <70o. This value was set as an upper limit for manufacturing. Ma5tip,rel < 1. This value was set to prevent supersonic loss (shock waves) at the rotor exit. d5,hub/d5,tip > 0.4. This value was set to avoid the possibility of flow blockage due to closely spaced vanes, as suggested in (Rohlik et al. 1968). d4>0.01 (m). This value was selected as the minimum threshold size for manufacturability. r5tip /r4 < 0.7. This limit was set to both accommodate the expanding fluid with significant decrease in density and to avoid excessive tip curvature and the associated secondary loss. Qin<16kW. Limit of heat source for future laboratory testing. 174 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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