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vapor rarefaction shock wave. In [34] Colonna & Silva presents the procedure for obtaining nonconventional thermodynamic properties needed by up to date computer flow solvers. Complex equation of state for pure fluids and mixtures are treated. Peng-Robinson thermodynamic model allows reproducing with good accuracy the experimental data. Kluwick [36] investigated shock/boundary layer interaction in dense gases via the triple deck theory. Their results show that it is possible to reduce the size of the separation bubble or even to avoid the occurrence of flow separation by choosing an optimal operation thermodynamic state. In [37] Colonna & Rebay presents the numerical methods and the models implemented in a computer code for simulating inviscid dense gas flows on unstructured grids. In [38] Guardone & Al. studied the accuracy of thermodynamic models in the computation of nonclassical gasdynamic phenomena. The Soave-Redlich-Kwong and the Peng-Robinson models are compared to the Martin-Hou equation. The three models are found to exhibit a comparable accuracy for an extended range of reduced volume, and for predicting the formation of supersonic nonclassical rarefaction wave. In [39] Cinnella & Congedo presented a numerical solver for inviscid flows governed by arbitrary equations of state. In particular, the stress is put on the choice of a suitable space discretisation scheme for dense gas problems. Two different schemes are considered: the first one, uses a third-order centred approximation with addition of scalar artificial viscosity; the second one, is a second-orderaccurate upwind scheme based on Roe’s flux difference splitting. Detailed cross-comparisons of the two schemes are provided for a variety of transonic flow problems past airfoils and turbine blades. In 2004, Cinnella & Congedo [40] have investigated the influence of BZT effects on the system performance of inviscid transonic lifting flows past a NACA0012 airfoil. Numerical simulations were performed by solving the Euler equations discretized by a third-order-accurate numerical scheme on very fine meshes. The gas response was modelled by the van der Waals equation of state for polytropic gases. In contrast with previous studies, the investigation was not restricted to flows with small free-stream Γ. On the contrary, the objective of the research was to explore the possibility of keeping part of the benefits deriving from BZT behavior while enlarging the operation range. At this end, a detailed parametric investigation of the airfoil aerodynamic performance was undertaken, with specific interest in configurations providing the best trade-off between high lift and low drag. The parametric study allowed to identify three flow regimes depending on the value of Γ∞ . For 24PDF Image | ANALYSIS AND OPTIMIZATION OF DENSE GAS FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES
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