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P. Colonna, S. Rebay, J. Harinck and A. Guardone For the simulation and design of this type of ORC expansion process, which operates partly in the nonideal gas thermodynamic region characterized by a compressibility factor of 0.69 < Z < 0.95, the use of the PRSV EoS appears well suited, since the fluid dynamic results are very similar for the SW and PRSV EoS. The use of the PIG EoS, on the other hand, leads to appreciable errors in the predicted aerodynamic performance parameters and flow features. For potentially more efficient supercritical ORC cycles, the use of the PRSV in the simulation of the turbine flow might also lead to relevant inaccuracies, since in this case a larger portion of the expansion process occurs in a highly nonideal thermodynamic region. Viscous simulations of similar turbines are planned, for which the zFlow program will be extended to the numerical solution of the Reynolds-averaged Navier-Stokes equations. References [1] J. Hoffren, T. Talonpoika, J. Larjola, and T. Siikonen. Numerical Simulation of Real-Gas Flow in a Supersonic Turbine Nozzle Ring. J. Eng. Gas Turbine Power, 124:395–403, 2002. [2] M. Cirri, P. Adami, and F. Martelli. Development of a CFD Real Gas Flow Solver for Hybrid Grid. Int. J. Numer. Methods Fluids, 47(8-9):931–938, March 2005. [3] A. Arnone M. Cecconi P. Boncinelli, F. Rubechini and C. Cortese. Real Gas Ef- fects in Turbomachinery Flows - A Computational Fluid Dynamics Model for Fast Computations. In Transactions of the ASME, volume 126, pages 268–276, 2004. [4] C. Cravero and A Satta. A CFD Model for Real Gas Flows. In ASME Turbo Expo, Munich, Germany, pages 1–10, New York, May 2000. ASME, ASME. [5] P. Colonna and S. Rebay. Numerical simulation of dense gas flows on unstructured grids with an implicit high resolution upwind Euler solver. Int. J. Numer. Meth. Fluids, 46(7):735–765, 2004. [6] V. Selmin. The node-centred finite volume approach: bridge between finite differences and finite elements. Comp. Meths. Appl. Mech. Eng., 102:107–138, 1993. [7] P. L. Roe. Approximate Riemann solvers, parameter vectors, and difference schemes. J. Comput. Phys., 43:357–372, 1981. [8] M. Vinokur and J. L. Montagn ́e. Generalized flux-vector splitting and Roe average for an equilibrium real gas. J. Comput. Phys., 89:276, 1990. [9] P. Colonna, A. Guardone, J. Harinck, and S. Rebay. Numerical Investigation of Dense Gas Effects in Turbine Cascades. In Proceedings of the 15th U.S. National Congress on Theoretical and Applied Mechanics, 2006. (in press). 17PDF Image | REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS
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