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CHAPTER 6: Three-Dimensional CFD Optimization of the Dual-Stage Organic RIT The contours of total pressure in the same figure depicts that the total pressure was almost constant around the volute with the value of about 10bars as needed. Such results indicate that the volute has very good aerodynamic performance with minimal losses. Also the section planes with velocity streamlines in the same figure confirm the uniformity of the total pressure with preferential flow in the volute. 6.8. Modelling and CFD analysis of the return channel Figure 6-30 presents a schematic of the return channel employed between the two stages. It consists of an inlet 90Β° turn, a vane-less channel and a 180Β° crossover bend which redirects the flow back to the inlet of the second stage. The choice of the contours (i.e. circular or elliptical) for the inlet turn and crossover are followed by the recommendations of (Aungier 2000). The systematic construction of the return channel provides a straightforward design with high aerodynamic performance. Designing such component requires the specification of r5,hub and r5,tip from stage one and b1 (equal to b3 in Figure 6-30) and r2 (equal to r3 in Figure 6-30) from stage two. For the inlet bend itβs required to specify Aturn and rturn together with Zrc. Then the centre point for both the hub elliptical arc and the shroud circular arc is located at z=Zrc and r= rturn+ r1,tip while the hub elliptical contour were determined as below: π΅π‘π’ππ = π1,π‘ππ β π1,hπ’π + ππ‘π’ππ π = π + π β π΅ β1 β (π§ β πππ)2 Equation 6-6 Equation 6-7 1,π‘ππ π‘π’ππ π‘π’ππ π΄π‘π’ππ 2 252 | P a g ePDF Image | SMALL-SCALE RADIAL INFLOW TURBINE FOR WHR ORC
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