Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine
A simulation strategy is developed for the computation of the time-accurate flow through low pressure turbines with periodically impinging wakes generated by moving cylinder rods. For the simulations, different time steps and turbulent inflow conditions and their impact on the laminar separation on...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Wiley
2007-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2007/10940 |
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| _version_ | 1832559106538340352 |
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| author | Romuald Skoda Rudolf Schilling Meinhard T. Schobeiri |
| author_facet | Romuald Skoda Rudolf Schilling Meinhard T. Schobeiri |
| author_sort | Romuald Skoda |
| collection | DOAJ |
| description | A simulation strategy is developed for the computation of the time-accurate flow through low pressure turbines with periodically impinging wakes generated by moving cylinder rods. For the simulations, different time steps and turbulent inflow conditions and their impact on the laminar separation on the suction side are considered. A realizable cubic low-Reynolds number k-ɛ turbulence model and a linear V2F model are utilized to capture transitional effects, in particular the laminar separation bubble at the suction side. For comparison with experimental data, published in a companion paper, pressure distribution and boundary layer profiles of the mean and fluctuation RMS velocity are considered. While the periodically disturbed flow is predicted with a reasonable accuracy by each model, for the undisturbed flow, an additional realizability condition based on a turbulent time scale bound is incorporated into the cubic model in order to capture the reattachment of the flow. |
| format | Article |
| id | doaj-art-e88f23c70bd440298234bb2419575dac |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2007-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-e88f23c70bd440298234bb2419575dac2025-02-03T01:30:52ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342007-01-01200710.1155/2007/1094010940Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure TurbineRomuald Skoda0Rudolf Schilling1Meinhard T. Schobeiri2Institute of Fluid Mechanics, Munich University of Technology, Garching 85747, GermanyInstitute of Fluid Mechanics, Munich University of Technology, Garching 85747, GermanyTurbomachinery Performance and Flow Research Laboratory, Texas A&M University, College Station, TX 77843-3123, USAA simulation strategy is developed for the computation of the time-accurate flow through low pressure turbines with periodically impinging wakes generated by moving cylinder rods. For the simulations, different time steps and turbulent inflow conditions and their impact on the laminar separation on the suction side are considered. A realizable cubic low-Reynolds number k-ɛ turbulence model and a linear V2F model are utilized to capture transitional effects, in particular the laminar separation bubble at the suction side. For comparison with experimental data, published in a companion paper, pressure distribution and boundary layer profiles of the mean and fluctuation RMS velocity are considered. While the periodically disturbed flow is predicted with a reasonable accuracy by each model, for the undisturbed flow, an additional realizability condition based on a turbulent time scale bound is incorporated into the cubic model in order to capture the reattachment of the flow.http://dx.doi.org/10.1155/2007/10940 |
| spellingShingle | Romuald Skoda Rudolf Schilling Meinhard T. Schobeiri Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine International Journal of Rotating Machinery |
| title | Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine |
| title_full | Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine |
| title_fullStr | Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine |
| title_full_unstemmed | Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine |
| title_short | Numerical Simulation of the Transitional and Unsteady Flow through a Low Pressure Turbine |
| title_sort | numerical simulation of the transitional and unsteady flow through a low pressure turbine |
| url | http://dx.doi.org/10.1155/2007/10940 |
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