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P. Colonna, S. Rebay, J. Harinck and A. Guardone Ma 2.0 1.8 1.5 1.3 1.0 0.8 0.5 0.3 0.0 Figure 6: Flow field Mach number including isobars and streamlines at part-load operation. The figure aspect ratio is distorted, since the turbine design is confidential property of the manufacturer. to a larger deviation of sound speed, fundamental derivative, velocity magnitude and density if the PIG model is compared to the SW and PRSV models. For the relative difference in Mach number (Fig. 3(a)), this deviation is not uniformly higher, but rather differently distributed. At the blade trailing edge and at the outflow boundary (Fig. 5(b)) the difference in Mach number between the PIG and SW EoS is smaller (even in relative terms) than for design-point operation. A similar phenomenon can be observed for the outflow angle in Fig. 5(a). This is surprising, since, for part-load, the final part of the expansion is more nonideal than for design-point, so that a larger deviation would be expected. The larger and steeper variation (i.e. less uniform) in Mach number (Fig. 5(b)) and flow angle (Fig. 5(a)) along the outflow boundary for the PIG EoS shows that the simu- lation based on the PIG EoS exhibits stronger shock waves, as was noted earlier. This is confirmed by the total pressure loss coefficient (Table 2), which is 6% higher for the PIG EoS. The deviation of the outflow Mach number based on the PRSV model with respect to SW model is negligible. The total pressure loss coefficient based on PRSV (Table 2) is only 1% lower than the one of the SW model. The choked conditions for both design-point and part-load can also be concluded from the equal mass flows as stated in Table 2. Consequently, the same differences in mass flow are observed between all the EoS models as happens for the design-point case. 4 CONCLUSIONS The novel zFlow program is used to investigate the influence of the polytropic ideal gas (PIG) equation of state (EoS), the Peng-Robinson-Stryjek-Vera (PRSV) cubic EoS and 15PDF Image | REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS
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