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82 6 Radial turbine design for a micro-ORC test setup Table 6.3: Nozzle simulation results. Case design point 80 % off-design 60 % off-design pin, [bar] 7.6 6.0 4.6 pin/pout, [-] 19.5 19.9 20.2 qm/qm,des, [-] 1.00 0.79 0.61 cout, [m/s] 312.0 311.3 309.3 Ma, [-] 2.36 2.37 2.39 5 x 10 5 4 3 2 1 0 02468 d/b , [−] t 100% 80% 60% 300 250 200 150 100 02468 d/b , [−] t 100% 80% 60% (a) (b) Figure 6.3: Static pressure change (a) and velocity magnitude (b) along the mean line of the nozzle divergent section at design conditions and at 80% and 60% off-design conditions. design condition. The simulated nozzle outlet velocity is slightly lower in the off-design conditions compared to the simulated result of design point. In general, the simulation results indicated that the real gas model was successfully implemented in the flow solver and uniform velocity and Mach number distribution were achieved at the nozzle outlet. 6.1.2 Stator simulations Different supersonic stator geometries were designed and simulated at the turbine design conditions and the results obtained with different geometries were compared to the results of 1D-turbine design values. The simulations were performed by using Chien’s k − ε and k − ω SST-turbulence models. The results obtained with the two different turbulence models were presented and compared. In addition, one of the designed stator geometry was studied at off-design working conditions by using k − ω SST-turbulence model in the simulations. The computational grid dependency was studied with one of the designed stator geome- tries in order to minimize the error in the simulation results due to grid spacing. The solutions were computed for the stator flow channel geometry with three different struc- Pressure, [Pa] Flow velocity, [m/s]PDF Image | WORKING FLUID SELECTION AND DESIGN OF SMALL-SCALE WASTE HEAT RECOVERY SYSTEMS BASED ON ORGANIC RANKINE CYCLES
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