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Int. J. Turbomach. Propuls. Power 2020, 5, 19 13 of 17 Figure 13. Mesh quality before refinement. Figure 14. Mesh quality after refinement. Figure 14. Mesh quality after refinement. The above settings led to an acceptable number of nodes for an accurate two-dimensional study The above settings led to an acceptable number of nodes for an accurate two-dimensional study (200,862 nodes and 387,202 elements) and a y+ from 40 to 150 along the blade surfaces. By the same (200,862 nodes and 387,202 elements) and a y+ from 40 to 150 along the blade surfaces. By the same line of reasoning, we obtained 2.6 million hexahedral elements for the 3D study. line of reasoning, we obtained 2.6 million hexahedral elements for the 3D study. −5 After a satisfactory convergence was obtained with a residual norm of the order of 10 , different After a satisfactory convergence was obtained with a residual norm of the order of 10−5, different thermodynamic quantities were extracted from the numerical solution and compared with the analytic thermodeyln,amssihcowqunaintiFtigeusrew1e5r.eTehxetroaucttpeudttforroqmuetwhaesncaulmcuelaritceadlastoelaucthiotinmeanstdepcofmthpeartwedo-wanitdh the Int. J. Turbomach. Propuls. Power 2019, 4, x FOR PEER REVIEW 13 of 16 analythtriceem-doimdeln,saiosnsahloswimnuilnatFioingsu,rteo 1co5m. Tphaereotuhteppuotwtoerqouetpwutaws citahlcthuelamteodealtperaecdhicttiimone. step of the two- and three-dimensional simulations, to compare the power output with the model prediction. (a) (b) FFigiguurere1155. .CCoonntotouurrssooffsstatatitciceennththaalplpyyfoforraasisninggleletitmimeestsetepp: :(a(a))22Dmooddeel;l;(b(b))33DDmooddeel.l. Figure 16 shows the output power for both rows in all the analyzed cases. The continuous Figure 16 shows the output power for both rows in all the analyzed cases. The continuous lines lines represent the model prediction, while the dashed lines represent the 2D configuration and the represent the model prediction, while the dashed lines represent the 2D configuration and the dotted dotted lines are their averages. The asterisks represent the 3D configuration which was analyzed in a lines are their averages. The asterisks represent the 3D configuration which was analyzed in a single single frame. frame.PDF Image | Optimal Design of a Ljungstrom Turbine for ORC Power
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