Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge
The nozzle guide vane, which is a stationary part of a gas turbine, is a critical component of gas turbine engines because it must operate under harsh conditions with high pressure and temperature. Unfortunately, when a gas turbine runs for a long time, the turbine vane is subjected to repeated ther...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2024-03-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/19/2/19_2024jfst0006/_pdf/-char/en |
| _version_ | 1797230144779190272 |
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| author | Siwanart KHUMHAENG Thitapa SUKSA Nutcha LAOHALERTCHAI Benyapa CHAIPRASIT Prasert PRAPAMONTHON Bo YIN |
| author_facet | Siwanart KHUMHAENG Thitapa SUKSA Nutcha LAOHALERTCHAI Benyapa CHAIPRASIT Prasert PRAPAMONTHON Bo YIN |
| author_sort | Siwanart KHUMHAENG |
| collection | DOAJ |
| description | The nozzle guide vane, which is a stationary part of a gas turbine, is a critical component of gas turbine engines because it must operate under harsh conditions with high pressure and temperature. Unfortunately, when a gas turbine runs for a long time, the turbine vane is subjected to repeated thermal load. This increases the possibility of fatigue damage and crack failure, thereby reducing the vane material's lifespan. In practice, the risk of failure at the trailing edge (TE) of a turbine vane is very high due to the reasons of shape configuration and cooling performance. The TE damage disturbs the flow physics of compressible air passing the vane TE, resulting in flow phenomena and heat convection. The study aims to numerically investigate the effects of damaged surfaces at the TE of a turbine vane on its flow behavior using computational fluid dynamics (CFD) with the SST k-w turbulence model. To simplify the simulation, the effects of the TE failure are presented by using two basic patterns, i.e., long (continuous) cutback damage, and two-short (discrete) cutback damage. To complete the investigation, a further study on the effects of repaired surfaces is included as well. The numerical results show the effects of damaged and repaired surfaces on flow behavior, particularly the vortex formation and the level of turbulent kinetic energy (TKE) in the TE region. Specifically, the damaged vane surface significantly increases the TKE level in the TE region, particularly the two-short damaged surface, which TKE shoots up to 7000-8000 m2/s2. Meanwhile, TKE in the normal and long damaged case is around 1500 and 4000 m2/s2. With the restoration of the vane surfaces, it can reduce the TKE level in the TE region. For instance, TKE is uniformly around 1750 m2/s2 for the long repaired surface. |
| first_indexed | 2024-04-24T15:23:49Z |
| format | Article |
| id | doaj.art-c2cb5008c6374584b17c3b7346be2806 |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-24T15:23:49Z |
| publishDate | 2024-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-c2cb5008c6374584b17c3b7346be28062024-04-02T07:08:56ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582024-03-01192JFST0006JFST000610.1299/jfst.2024jfst0006jfstNumerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edgeSiwanart KHUMHAENG0Thitapa SUKSA1Nutcha LAOHALERTCHAI2Benyapa CHAIPRASIT3Prasert PRAPAMONTHON4Bo YIN5Key Laboratory for Computational Mechanics & Heat Transfer Applications, Department of Aeronautical Engineering, International Academy of Aviation Industry, King Mongkut’s Institute of Technology LadkrabangKey Laboratory for Computational Mechanics & Heat Transfer Applications, Department of Aeronautical Engineering, International Academy of Aviation Industry, King Mongkut’s Institute of Technology LadkrabangKey Laboratory for Computational Mechanics & Heat Transfer Applications, Department of Aeronautical Engineering, International Academy of Aviation Industry, King Mongkut’s Institute of Technology LadkrabangKey Laboratory for Computational Mechanics & Heat Transfer Applications, Department of Aeronautical Engineering, International Academy of Aviation Industry, King Mongkut’s Institute of Technology LadkrabangKey Laboratory for Computational Mechanics & Heat Transfer Applications, Department of Aeronautical Engineering, International Academy of Aviation Industry, King Mongkut’s Institute of Technology LadkrabangKey Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of SciencesThe nozzle guide vane, which is a stationary part of a gas turbine, is a critical component of gas turbine engines because it must operate under harsh conditions with high pressure and temperature. Unfortunately, when a gas turbine runs for a long time, the turbine vane is subjected to repeated thermal load. This increases the possibility of fatigue damage and crack failure, thereby reducing the vane material's lifespan. In practice, the risk of failure at the trailing edge (TE) of a turbine vane is very high due to the reasons of shape configuration and cooling performance. The TE damage disturbs the flow physics of compressible air passing the vane TE, resulting in flow phenomena and heat convection. The study aims to numerically investigate the effects of damaged surfaces at the TE of a turbine vane on its flow behavior using computational fluid dynamics (CFD) with the SST k-w turbulence model. To simplify the simulation, the effects of the TE failure are presented by using two basic patterns, i.e., long (continuous) cutback damage, and two-short (discrete) cutback damage. To complete the investigation, a further study on the effects of repaired surfaces is included as well. The numerical results show the effects of damaged and repaired surfaces on flow behavior, particularly the vortex formation and the level of turbulent kinetic energy (TKE) in the TE region. Specifically, the damaged vane surface significantly increases the TKE level in the TE region, particularly the two-short damaged surface, which TKE shoots up to 7000-8000 m2/s2. Meanwhile, TKE in the normal and long damaged case is around 1500 and 4000 m2/s2. With the restoration of the vane surfaces, it can reduce the TKE level in the TE region. For instance, TKE is uniformly around 1750 m2/s2 for the long repaired surface.https://www.jstage.jst.go.jp/article/jfst/19/2/19_2024jfst0006/_pdf/-char/enflow behaviorgas-turbine vanedamagetrailing edgecomputational fluid dynamics (cfd) |
| spellingShingle | Siwanart KHUMHAENG Thitapa SUKSA Nutcha LAOHALERTCHAI Benyapa CHAIPRASIT Prasert PRAPAMONTHON Bo YIN Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge Journal of Fluid Science and Technology flow behavior gas-turbine vane damage trailing edge computational fluid dynamics (cfd) |
| title | Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| title_full | Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| title_fullStr | Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| title_full_unstemmed | Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| title_short | Numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| title_sort | numerical investigation of effects of damaged and repaired surfaces on flow behavior of nozzle vane trailing edge |
| topic | flow behavior gas-turbine vane damage trailing edge computational fluid dynamics (cfd) |
| url | https://www.jstage.jst.go.jp/article/jfst/19/2/19_2024jfst0006/_pdf/-char/en |
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