2008
Rubechini, Filippo; Marconcini, Michele; Arnone, Andrea; Maritano, Massimiliano; Cecchi, Stefano
The Impact of Gas Modeling in the Numerical Analysis of a Multistage Gas Turbine Journal Article
In: ASME Journal of Turbomachinery, vol. 130, pp. 021022, 2008, ISSN: 0889-504X.
@article{RMAMC08,
title = {The Impact of Gas Modeling in the Numerical Analysis of a Multistage Gas Turbine},
author = {Filippo Rubechini and Michele Marconcini and Andrea Arnone and Massimiliano Maritano and Stefano Cecchi},
url = {http://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=1467704},
doi = {10.1115/1.2752187},
issn = {0889-504X},
year = {2008},
date = {2008-04-01},
journal = {ASME Journal of Turbomachinery},
volume = {130},
pages = {021022},
abstract = {In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows, and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp, and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel/air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at the inlet/outlet of each row and total temperature at the turbine exit.},
keywords = {},
pubstate = {published},
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In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows, and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp, and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel/air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at the inlet/outlet of each row and total temperature at the turbine exit.
Rubechini, Filippo; Marconcini, Michele; Arnone, Andrea
A CFD Model for Real Gas Effects in Turbomachinery Conference
8th World Congress on Computational Mechanics (WCCM8), 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008), 2008, (Venezia, Italy, June 30 - July 5, 2008).
@conference{RMA08,
title = {A CFD Model for Real Gas Effects in Turbomachinery},
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year = {2008},
date = {2008-01-01},
booktitle = {8th World Congress on Computational Mechanics (WCCM8), 5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008)},
note = {Venezia, Italy, June 30 - July 5, 2008},
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Marconcini, Michele; Rubechini, Filippo; Arnone, Andrea; Ibaraki, Seiichi
Numerical Investigation of a Transonic Centrifugal Compressor Journal Article
In: ASME Journal of Turbomachinery, vol. 130, pp. 011010, 2008, ISSN: 0889-504X.
@article{MRAI08,
title = {Numerical Investigation of a Transonic Centrifugal Compressor},
author = {Michele Marconcini and Filippo Rubechini and Andrea Arnone and Seiichi Ibaraki},
url = {http://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=1467613},
doi = {10.1115/1.2752186},
issn = {0889-504X},
year = {2008},
date = {2008-01-01},
journal = {ASME Journal of Turbomachinery},
volume = {130},
pages = {011010},
abstract = {A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high-pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vaned diffuser. The inlet flow to the open shrouded impeller is transonic, thus giving rise to interactions between shock waves and boundary layers and between shock waves and tip leakage vortices. These interactions generate complex flow structures which are convected and distorted through the impeller blades. Detailed laser Doppler velocimetry flow measurements are available at various cross sections inside the impeller blades highlighting the presence of low-velocity flow regions near the shroud. Particular attention is focused on understanding the physical mechanisms which govern the flow phenomena in the near shroud region. To this end numerical investigations are performed using different tip clearance modelizations and various turbulence models, and their impact on the computed flow field is discussed.},
keywords = {},
pubstate = {published},
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A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high-pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vaned diffuser. The inlet flow to the open shrouded impeller is transonic, thus giving rise to interactions between shock waves and boundary layers and between shock waves and tip leakage vortices. These interactions generate complex flow structures which are convected and distorted through the impeller blades. Detailed laser Doppler velocimetry flow measurements are available at various cross sections inside the impeller blades highlighting the presence of low-velocity flow regions near the shroud. Particular attention is focused on understanding the physical mechanisms which govern the flow phenomena in the near shroud region. To this end numerical investigations are performed using different tip clearance modelizations and various turbulence models, and their impact on the computed flow field is discussed.
2007
Marconcini, Michele; Rubechini, Filippo; Arnone, Andrea; Ibaraki, Seiichi
Numerical Analysis of the Vaned Diffuser of a Transonic Centrifugal Compressor Proceeding
ASME, Montreal, Canada, May 14–17, 2007, vol. 6: Turbo Expo 2007, Parts A and B, 2007, ISBN: 0-7918-4795-0, (Paper No. GT2007-27200).
@proceedings{955,
title = {Numerical Analysis of the Vaned Diffuser of a Transonic Centrifugal Compressor},
author = {Michele Marconcini and Filippo Rubechini and Andrea Arnone and Seiichi Ibaraki},
url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1602887&resultClick=1},
doi = {dx.doi.org/10.1115/GT2007-27200},
isbn = {0-7918-4795-0},
year = {2007},
date = {2007-05-01},
journal = {ASME Turbo Expo 2007: Power for Land, Sea, and Air},
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abstract = {A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vaned diffuser. Particular attention is focused on the analysis of the vaned diffuser, designed for high subsonic inlet conditions. The diffuser is characterized by a complex three-dimensional flow field, and influenced by the unsteady interaction with the impeller. Detailed Particle Image Velocimetry (PIV) flow measurements within the diffuser are available for comparison purposes.},
note = {Paper No. GT2007-27200},
keywords = {},
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A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vaned diffuser. Particular attention is focused on the analysis of the vaned diffuser, designed for high subsonic inlet conditions. The diffuser is characterized by a complex three-dimensional flow field, and influenced by the unsteady interaction with the impeller. Detailed Particle Image Velocimetry (PIV) flow measurements within the diffuser are available for comparison purposes.
Rubechini, Filippo; Marconcini, Michele; Arnone, Andrea; Cecchi, Stefano; `a, Federico Dacc
Some Aspects of CFD Modeling in the Analysis of a Low-Pressure Steam Turbine Proceeding
AMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA, Montreal, Canada, May 14–17, vol. 6: Turbomachinery, Parts A and B, 2007, ISBN: 0-7918-4795-0, (ASME paper GT2007-27235).
@proceedings{RMACD07,
title = {Some Aspects of CFD Modeling in the Analysis of a Low-Pressure Steam Turbine},
author = {Filippo Rubechini and Michele Marconcini and Andrea Arnone and Stefano Cecchi and Federico Dacc `a},
url = {http://link.aip.org/link/abstract/ASMECP/v2007/i47950/p519/s1},
doi = {10.1115/GT2007-27235},
isbn = {0-7918-4795-0},
year = {2007},
date = {2007-01-01},
journal = {ASME Turbo Expo},
volume = {6: Turbomachinery, Parts A and B},
pages = {519–526},
publisher = {AMER SOC MECHANICAL ENGINEERS, THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA},
address = {Montreal, Canada, May 14–17},
abstract = {A three-dimensional, multistage, Navier-Stokes solver is applied to the numerical investigation of a four stage low-pressure steam turbine. The thermodynamic behavior of the wet steam is reproduced by adopting a real-gas model, based on the use of gas property tables. Geometrical features and flow-path details consistent with the actual turbine geometry, such as cavity purge flows, shroud leakage flows and partspan snubbers, are accounted for, and their impact on the turbine performance is discussed. These details are included in the analysis using simple models, which prevent a considerable growth of the computational cost and make the overall procedure attractive as a design tool for industrial purposes. Shroud leakage flows are modeled by means of suitable endwall boundary conditions, based on coupled sources and sinks, while body forces are applied to simulate the presence of the damping wires on the blades. In this work a detailed description of these models is provided, and the results of computations are compared with experimental measurements.},
note = {ASME paper GT2007-27235},
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pubstate = {published},
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A three-dimensional, multistage, Navier-Stokes solver is applied to the numerical investigation of a four stage low-pressure steam turbine. The thermodynamic behavior of the wet steam is reproduced by adopting a real-gas model, based on the use of gas property tables. Geometrical features and flow-path details consistent with the actual turbine geometry, such as cavity purge flows, shroud leakage flows and partspan snubbers, are accounted for, and their impact on the turbine performance is discussed. These details are included in the analysis using simple models, which prevent a considerable growth of the computational cost and make the overall procedure attractive as a design tool for industrial purposes. Shroud leakage flows are modeled by means of suitable endwall boundary conditions, based on coupled sources and sinks, while body forces are applied to simulate the presence of the damping wires on the blades. In this work a detailed description of these models is provided, and the results of computations are compared with experimental measurements.
2006
Rubechini, Filippo; Marconcini, Michele; Arnone, Andrea; Maritano, Massimiliano; Cecchi, Stefano
The Impact of Gas Modeling in the Numerical Analysis of a Multistage Gas Turbine Proceeding
ASME, Barcelona, Spain, May 8–11, 2006, vol. 6: Turbomachinery, Parts A and B, 2006, ISBN: 0-7918-4241-X.
@proceedings{956,
title = {The Impact of Gas Modeling in the Numerical Analysis of a Multistage Gas Turbine},
author = {Filippo Rubechini and Michele Marconcini and Andrea Arnone and Massimiliano Maritano and Stefano Cecchi},
url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1587534&resultClick=1},
doi = {dx.doi.org/10.1115/GT2006-90129},
isbn = {0-7918-4241-X},
year = {2006},
date = {2006-05-01},
journal = {ASME Turbo Expo 2006: Power for Land, Sea, and Air},
volume = {6: Turbomachinery, Parts A and B},
pages = {531-539},
publisher = {ASME},
address = {Barcelona, Spain, May 8–11, 2006},
abstract = {In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp , and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel/air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at inlet/outlet of each row and total temperature at the turbine exit.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
In this work a numerical investigation of a four stage heavy-duty gas turbine is presented. Fully three-dimensional, multistage, Navier-Stokes analyses are carried out to predict the overall turbine performance. Coolant injections, cavity purge flows and leakage flows are included in the turbine modeling by means of suitable wall boundary conditions. The main objective is the evaluation of the impact of gas modeling on the prediction of the stage and turbine performance parameters. To this end, four different gas models were used: three models are based on the perfect gas assumption with different values of constant cp , and the fourth is a real gas model which accounts for thermodynamic gas properties variations with temperature and mean fuel/air ratio distribution in the through-flow direction. For the real gas computations, a numerical model is used which is based on the use of gas property tables, and exploits a local fitting of gas data to compute thermodynamic properties. Experimental measurements are available for comparison purposes in terms of static pressure values at inlet/outlet of each row and total temperature at the turbine exit.
Marconcini, Michele; Rubechini, Filippo; Arnone, Andrea; Ibaraki, Seiichi
Numerical Investigation of a Transonic Centrifugal Compressor Proceeding
ASME, Barcelona, Spain, May 8–11, 2006, vol. 6: Turbomachinery, Parts A and B, 2006, ISBN: 0-7918-4241-X.
@proceedings{957,
title = {Numerical Investigation of a Transonic Centrifugal Compressor},
author = {Michele Marconcini and Filippo Rubechini and Andrea Arnone and Seiichi Ibaraki},
url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1587685&resultClick=1},
doi = {dx.doi.org/10.1115/GT2006-90098},
isbn = {0-7918-4241-X},
year = {2006},
date = {2006-05-01},
journal = {ASME Turbo Expo 2006: Power for Land, Sea, and Air},
volume = {6: Turbomachinery, Parts A and B},
pages = {1005-1012},
publisher = {ASME},
address = {Barcelona, Spain, May 8–11, 2006},
abstract = {A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vane diffuser. The inlet flow to the open shrouded impeller is transonic, thus giving rise to interactions between shock waves and boundary layers and between shock waves and tip leakage vortices. These interactions generate complex flow structures which are convected and distorted through the impeller blades. Detailed Laser Doppler Velocimetry (LDV) flow measurements are available at various cross sections inside the impeller blades highlighting the presence of low velocity flow regions near the shroud. Particular attention is focused on understanding the physical mechanisms which govern the flow phenomena in the near shroud region. To this end numerical investigations are performed using different tip clearance modelizations and various turbulence models, and their impact on the computed flow field is discussed.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed by a vane diffuser. The inlet flow to the open shrouded impeller is transonic, thus giving rise to interactions between shock waves and boundary layers and between shock waves and tip leakage vortices. These interactions generate complex flow structures which are convected and distorted through the impeller blades. Detailed Laser Doppler Velocimetry (LDV) flow measurements are available at various cross sections inside the impeller blades highlighting the presence of low velocity flow regions near the shroud. Particular attention is focused on understanding the physical mechanisms which govern the flow phenomena in the near shroud region. To this end numerical investigations are performed using different tip clearance modelizations and various turbulence models, and their impact on the computed flow field is discussed.
2004
Boncinelli, P; Rubechini, Filippo; Arnone, Andrea; Cecconi, M; Cortese, C
Real Gas Effects in Turbomachinery Flows: a CFD Model for Fast Computations Journal Article
In: ASME Journal of Turbomachinery, vol. 126, no. 2, pp. 268–276, 2004, ISSN: 0889-504X.
@article{BRACC04,
title = {Real Gas Effects in Turbomachinery Flows: a CFD Model for Fast Computations},
author = {P Boncinelli and Filippo Rubechini and Andrea Arnone and M Cecconi and C Cortese},
url = {http://link.aip.org/link/?JTM/126/268/1},
doi = {10.1115/1.1738121},
issn = {0889-504X},
year = {2004},
date = {2004-01-01},
journal = {ASME Journal of Turbomachinery},
volume = {126},
number = {2},
pages = {268–276},
abstract = {A numerical model was included in a three-dimensional viscous solver to account for real gas effects in the compressible Reynolds averaged Navier-Stokes (RANS) equations. The behavior of real gases is reproduced by using gas property tables. The method consists of a local fitting of gas data to provide the thermodynamic property required by the solver in each solution step. This approach presents several characteristics which make it attractive as a design tool for industrial applications. First of all, the implementation of the method in the solver is simple and straightforward, since it does not require relevant changes in the solver structure. Moreover, it is based on a low-computational-cost algorithm, which prevents a considerable increase in the overall computational time. Finally, the approach is completely general, since it allows one to handle any type of gas, gas mixture or steam over a wide operative range. In this work a detailed description of the model is provided. In addition, some examples are presented in which the model is applied to the thermo-fluid-dynamic analysis of industrial turbomachines.},
keywords = {},
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tppubtype = {article}
}
A numerical model was included in a three-dimensional viscous solver to account for real gas effects in the compressible Reynolds averaged Navier-Stokes (RANS) equations. The behavior of real gases is reproduced by using gas property tables. The method consists of a local fitting of gas data to provide the thermodynamic property required by the solver in each solution step. This approach presents several characteristics which make it attractive as a design tool for industrial applications. First of all, the implementation of the method in the solver is simple and straightforward, since it does not require relevant changes in the solver structure. Moreover, it is based on a low-computational-cost algorithm, which prevents a considerable increase in the overall computational time. Finally, the approach is completely general, since it allows one to handle any type of gas, gas mixture or steam over a wide operative range. In this work a detailed description of the model is provided. In addition, some examples are presented in which the model is applied to the thermo-fluid-dynamic analysis of industrial turbomachines.