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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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Figure 26: Viscous performance of minimal-drag airfoils stemming from inviscid optimization. 4.3.1.2. Performance Optimization for a Lifting Airfoil The shape representation retained for the complete airfoil derives from that adopted in the study of a half profile. The upper part of the airfoil is represented as described in the previous subsection; the lower part is described in a similar way using a Bezier curve based on 8 control points, including the fixed leading and trailing edges, as well as a point on the negative part of the y-axis in order to ensure the airfoil leading edge is tangent to the y-axis. Once the whole airfoil is generated, the thickness distribution is normalized to yield a 12% thickness-to-chord ratio. The computation of the dense gas flow at M ∞ = 0.85 and α = 1° is considered. The dense gas is modeled using MAH equation of state with coefficients corresponding to PP10. The UGS is used to simulated. Two operation points of interest are selected : the freestream t h e r mo d y n a mi c c o n d i t i on s ( p ∞ / p c = 1. 0 0 8 , ρ ∞ / ρ c = 0. 676 , Γ∞ = 0 . 168 ) denoted OP#1, yield significant BZT effects, whereas the choice ( p∞ / pc = 1.079 , ρ∞ / ρc = 0.882 , Γ∞ =1.312), denoted OP#2, leads to higher values of the fundamental derivative throughout the flow, and thus to much reduced BZT effects. By considering a flow past a 80

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