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Appl. Sci. 2018, 8, 2038 14 of 16 (3) The CFD results of T-100 and T-100re turbines are examined and compared to the T-100 turbine experimental data. It shows that the total-to-static efficiency is a little higher than that of the experiment results due to ignorance of the windage loss and the flow non-uniformity at the volute outlet in the CFD simulations, but the trend of both results are in good agreement. In addition, the performance of T-100re turbine is better than that of T-100 turbine under most conditions. Author Contributions: Conceptualization, Q.-H.D.; Methodology, Q.-H.D. and S.S.; Software, L.F. and H.-F.L.; Writing-Original Draft Preparation, S.S.; Writing-Review & Editing, Q.-H.D. and Z.-P.F. Funding: This study is partially supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20130201130005). Conflicts of Interest: The authors declare no conflict of interest. Abbreviations Notation b c kf m n r r s t C Ca,Cr DH Kp, Ka, Kr, Ka,r LH Nr Re U W Zr α β ∆hc ∆he ∆hi ∆hn ∆hp ∆hte ∆hw ∆Hu ∆P0,te ε ηts ρ ρ φ ψ blade height, m chord, m friction coefficient mass flow rate, kg/s rational speed of rotor, r/min radius, m average radius, m pitch, m blade thickness, m absolute flow velocity, m/s coefficient of axial and radial direction diameter of the hydraulic, m empirical coefficient length of the hydraulic, m number of rotor blades Reynolds number blade circular velocity, m/s relative flow velocity, m/s axial width of rotor, m absolute flow angle, ◦ relative flow angle, ◦ rotor tip clearance loss, kJ/kg rotor exit energy loss, kJ/kg incidence loss at rotor inlet, kJ/kg nozzle loss, kJ/kg rotor passage loss, kJ/kg trailing edge loss, kJ/kg windage loss, kJ/kg effective enthalpy drop of radial inflow turbines, kJ/kg total pressure loss of trailing edge, Pa clearance, m total-to-static efficiency density, kg/m3 average density, kg/m3 flow coefficient loading coefficientPDF Image | Design and Optimization Approach for Radial Inflow Turbines
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