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3. Oct. 05, 2015 Won-Seok Heo Turbo System & Control Laboratory Institute of Advanced Machines and Design(IAMD) School of Mechanical and Aerospace Engineering Seoul National University Design and Performance Prediction of Centrifugal Compressor Mech – Aero 2015 - Aerodynamics -

4. Turbo System and Control Laboratory, Seoul National University 3  Introduction  Research Objective and Numerical Method  Validation of CFD calculation results  Analysis & Prediction model  Conclusions Contents

5. Turbo System and Control Laboratory, Seoul National University 4 Centrifugal compressor

6. Turbo System and Control Laboratory, Seoul National University 5 Research subject 01 2 4 3 5 Volute exit 8 Diffuser vane Impeller blade Shroud Hub 1.1

7. Turbo System and Control Laboratory, Seoul National University 6 Simulation Condition Type Tool Single PassageFull Passage Grid CFX Turbo Grid CFX Turbo Grid / ICEM Total nodes120k2200k Solver ToolANSYS CFX 11.0 Turbulence modelk-ε RANS Simulation typeSteady Boundary condition Inlet Total pressure Total temperature Flow angle OutletMass flow rate InterfaceMixing plane

8. Turbo System and Control Laboratory, Seoul National University 7 Validation of CFD result

9. Turbo System and Control Laboratory, Seoul National University 8 Performance map ●

10. Turbo System and Control Laboratory, Seoul National University 9 Impeller choking near shroud(0.9span) ; Mu=1.10, ϕ =0.158 Shock wave 1.1 1.45

11. Turbo System and Control Laboratory, Seoul National University 10 Impeller Performance ; Work coefficient

12. Turbo System and Control Laboratory, Seoul National University 11 Flow chart ; Work coefficient Prediction model

13. Turbo System and Control Laboratory, Seoul National University 12 Flow angle function of flow coefficient at impeller exit

14. Turbo System and Control Laboratory, Seoul National University 13 Flow angle function of flow coefficient at impeller exit

15. Turbo System and Control Laboratory, Seoul National University 14 1D equation for predicting work coefficient

16. Turbo System and Control Laboratory, Seoul National University 15 Flow angle function of flow coefficient at impeller exit

17. Turbo System and Control Laboratory, Seoul National University 16 Flow angle function of flow coefficient at impeller exit

18. Turbo System and Control Laboratory, Seoul National University 17 1D equation for predicting work coefficient

19. Turbo System and Control Laboratory, Seoul National University 18

20. Turbo System and Control Laboratory, Seoul National University 19 Reynolds number function of flow angle at impeller exit

21. Turbo System and Control Laboratory, Seoul National University 20 MuA(Intercept)BC 0.8428304.923436.26-94.0204 0.9-6.42E+0559452.49-330.27 1.03113249-7.01E+06247965.3-1636.95 1.1-1.59E+07500285.9-3371.06 1.15-2.46E+07737054.4-4953.38 Reynolds number function of flow angle at impeller exit

22. Turbo System and Control Laboratory, Seoul National University 21 Reynolds number function of flow angle at impeller exit

23. Turbo System and Control Laboratory, Seoul National University 22 Flow coefficient correlation & Prediction of work coefficient

24. Turbo System and Control Laboratory, Seoul National University 23 Reynolds number function of flow angle at impeller exit

25. Turbo System and Control Laboratory, Seoul National University 24 MuA(Intercept)BC 0.8-57763.37738278.95-208.191 0.9-1.26E+0677309.94-460.208 1.03113249-7.16E+06249087.7-1623.32 1.1-1.34E+07421370.7-2771.21 1.15-1.76E+07532723-3461.57 Reynolds number function of flow angle at impeller exit

26. Turbo System and Control Laboratory, Seoul National University 25 Reynolds number function of flow angle at impeller exit

27. Turbo System and Control Laboratory, Seoul National University 26 Flow coefficient correlation & Prediction of work coefficient

28. Turbo System and Control Laboratory, Seoul National University 27  Centrifugal compressor - Centrifugal compressor(Z v =12) data analysis - Imp.-diff. matching correlation of the number of vanes  Vaned diffuser - Calculation of diverse vaned diffusers( ξ =70 ° ) by CFD - Investigation of design parameters  Accumulation of data base : CFD(by SNU), test(by STW)  Development of the in-house program(by MATLAB) - 1D aerodynamic design model - Performance prediction model conclusion

29. Turbo System and Control Laboratory, Seoul National University 28 Thank you for your attention.

30. Turbo System and Control Laboratory, Seoul National University 29 Solidity