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6.1 Design and flow analysis of the turbine 81 Figure 6.1: Velocity triangles of the designed turbine. three slightly different turbine rotor geometries at the turbine design working condition are presented and discussed. 6.1.1 Expansion in a converging-diverging nozzle The fluid expansion in one of the designed converging-diverging nozzles was studied by using turbine design and off-design conditions. These simulations were performed in or- der to study the expansion ratio over the convergent-divergent nozzle as well as the Mach number and the flow velocity at the nozzle outlet. The nozzle simulations were performed by using the k − ω SST-turbulence model. The velocity contours in the nozzle flow chan- nel are presented in Figure 6.2. The main results obtained in the nozzle simulations are presented in Table 6.3. The pressure change and flow velocity in the mean line of the nozzle flow channel from the nozzle throat to the nozzle outlet are presented in Figure 6.3a and Figure 6.3b. Figure 6.2: Velocity magnitude contours in the throat and in the diverging part of the supersonic nozzle. As presented in Table 6.3 and in Figure 6.3a and Figure 6.3b, the pressure ratio over the nozzle and the outlet Mach number are slightly higher in off-design conditions than in thePDF Image | WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES
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