REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS

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REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS ( real-gas-effects-in-orc-turbine-flow-simulations )

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P. Colonna, S. Rebay, J. Harinck and A. Guardone 1 0.95 0.9 0.85 0.8 0.75 0.7 0 0.5 1 S/C (a) Compressibility factor 35 30 25 20 15 10 5 0 0 0.5 1 S/C (b) Velocity magnitude, relative to the SW EoS 5 0 -5 -10 0 0.5 1 S/C (c) Mach number, relative to the SW EoS (d) Density, relative to the SW EoS Figure 4: Blade surface distributions at design-point (continuous line) and at part-load (dashed line) based on SW ( ), PRSV ( ) and PIG ( ). The compressibility factor, denoted by Z, serves as a measure for the deviation from ideal gas behavior. Its distribution in Fig. 4(a) puts into evidence that only the first part (approximately S/C < 0.5) of the expansion process is very nonideal (0.65 < Z < 0.8). Consequently, in this initial part the fluid dynamic parameters (Mach, velocity, density) computed based on the PIG EoS have the largest deviation with respect to the SW EoS. As the fluid rapidly expands toward lower pressure states the nonideality is reduced to only Z = 0.94 (near ideal gas). The absolute magnitude of the velocity, based on the accurate SW EoS, increases from almost zero at the leading edge (S/C = 0) to 253 m/s at S/C = 1. The relative difference 12 5 0 -5 -10 -15 -20 -25 -30 -350 0.5 1 S/C (Ma-MaSW)/MaSW · 100% Ζ (ρ-ρSW)/ρSW · 100% (U-USW)/USW · 100%

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