10:00
Simulation and design tools: CFD
Chair: Prof. Paola Cinnella
10:00
20 mins
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ADJOINT METHOD FOR SHAPE OPTIMIZATION IN REAL GAS FLOW APPLICATIONS
Matteo Pini, Giacomo Persico, David Pasquale, Antonio Ghidoni, Stefano Rebay
Abstract: Organic Rankine Cycles (ORC) are nowadays a well-established
technology compared to steam Rankine Cycles for heat sources
characterized by low to medium temperatures.
Despite their relatively simplicity and cost-effectiveness, ORC technology
presents intrinsic difficulties connected to the design of the turbine,
due to the onset of complex real gas-dynamic phenomena.
Improvements in the fluid-dynamic design of the turbo-expanders are therefore expected to considerably enhance the performance of the overall system.
As a result the implementation of specific fluid-dynamic design procedures, which generally imply the use of advanced optimization methods coupled with accurate flow solvers, is of paramount importance for the whole ORC technology. In this
perspective this research presents a novel adjoint-based method for shape optimization of turbomachinery blades in real gas flow applications. In order to investigate the potential of the method, the optimization strategy is finally applied to the re-design of an ORC supersonic cascade.
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10:20
20 mins
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INVISCID STATOR/ROTOR INTERACTION OF A SINGLE STAGE HIGH EXPANSION RATIO ORC TURBINE
Enrico Rinaldi, Antonio Buonocore, Rene Pecnik, Piero Colonna
Abstract: see file
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10:40
20 mins
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1D AND 3D TOOLS TO DESIGN SUPERCRITICAL CO2 RADIAL COMPRESSORS: A COMPARISON
Benjamin Monje, David Sánchez, Mark Savill, Pericles Pilidis, Tomás Sánchez
Abstract: With the aim of creating an integral package for supercritical CO2 (S-CO2) centrifugal compressor design, the authors have developed a 1D tool fed with basic design parameters obtained from cycle calculations. This tool has been validated both for air and S-CO2 compressor performance, showing satisfactory agreement with published experimental results, and also combined with a simple optimisation algorithm to produce as efficient a compressor design as possible. This design has then been checked with a 3D CFD tool, at a second stage of the design process, where the following problems have been identified: (i) there is a lower than 5% difference between the 1D and 3D estimated performance of the compressor if tip and friction losses are neglected in the fully 3D analysis aiming for a low computational time; (ii) condensation of carbon dioxide is likely to take place in regions of local acceleration of the fluid, bringing about a need for a more complex simulation of the fluid properties and flow behaviour (multiphase flow).
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