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→ U → u Mean velocity vector Fluctuating velocity vector 0 * ex v θ ψ Source term τ Molecular stress tensor μt Turbulent viscosity ς Loss coefficient Subscripts Volute inlet Turbine inlet stagnation condition Exit Volute Tangential Azimuth angle position SM T Static temperature, Pulse period t Time R gas constant of air M Abidat, M K Hamidou, M Hachemi And M Hamel finite volume method is carried out to investigate the flow in the two volutes. The investigation outlined the complex flow structure downstream of the volute tongue resulting in a non uniform flow distribution on the volute exit periphery. Some features of the volute such as the total pressure loss coefficient and the averaged volute exit flow angle are also presented. The method presented in this study can be used to complete the one dimensional method, generaly applied in the design of the volute of radial and mixed flow turbines. NOMENCLATURE A Area H Mean total Enthalpy k Turbulent kinetic energy P Static pressure qm Mass flow rate qmr Reduced mass flow rate r Radius 0 u Parameter V Velocity α Flow angle REFERENCES 1. Chapple, P. M., Flynn, P. F., and Mulloy, J. M. Aerodynamic Design of Fixed and Variable Geometry Nozzle-Less Casings, ASME J. Eng. Power, 102, pp. 141–147, 1980N. 2. Lymberopoulos, N.C. Baines and N. Watson (1988). Flow in single and twin-entry radial turbine volutes. ASME, Paper 88-GT-59, 1988. 3. M.C.S. Barnard and R.S. Benson (1968). Radial gaz turbines. Proc. IMechE, Vol 183, 1968. 4. F. Gu, A. Engeda and E. Benisek. A comparative study of incompressible and compressible design approaches of radial inflow turbine volutes. Proceedings of the Institution of Mechanical Engineers, Vol 215, Part A, 2001. 5. K. R. Pullen (1991). Design and development of a small gas turbine and high speed generator. PhD thesis, Imperial College, University of London, 1991. ε Turbulent kinetic energy dissipation λ Thermal conductivity ψ Azimuth angle ρ DensityPDF Image | ANALYSIS OF RADIAL AND MIXED FLOW TURBINE VOLUTES
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