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ANALYSIS AND OPTIMIZATION OF DENSE GAS FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES

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ANALYSIS AND OPTIMIZATION OF DENSE GAS FLOWS: APPLICATION TO ORGANIC RANKINE CYCLES TURBINES ( analysis-and-optimization-dense-gas-flows-application-to-org )

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course finite, although high values. In the low-pressure transonic BZT regime the differences become more significant. Namely, the suction peak at the airfoil upper surface is dramatically smoothed out because of viscous effects, and the location of the upper shock wave moves upstream because of interactions with the boundary layer: nevertheless, the flow remains attached. Also note that in this regime the skin friction (see Figure 13) significantly grows with chordwise distance up to x/c ≈ 0.25, due to the very strong favorable pressure gradient acting on the boundary layer. Finally, in the third regime strong shock/boundary layer interactions lead to flow separation at both airfoil surfaces: nonetheless, separation is delayed and separated regions are smaller than in perfect gas flow. In summary, the preceding results suggest that DG effects mainly affect the inviscid flow behavior, whereas the viscous behavior is influenced indirectly according to the distributions of the external pressure and Mach number characterizing flows at different operating conditions. Concerning system efficiency, the use of dense gases working at proper operating conditions has a definitely beneficial effect on system efficiency, not only because of significant reductions in wave drag, but also because losses due to shock/boundary layer interaction are completely suppressed or strongly attenuated. 61

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