Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method
The rotor is the core component of a gas turbine, and more than 80% of the failures in gas turbines occur in the rotor system, especially during the start-up period. Therefore, the safety assessment of the rotor during the start-up period is essential for the design of the gas turbine. In this paper...
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2018/1029520 |
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| _version_ | 1849307083860606976 |
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| author | Yang Liu Qi Yuan Guangyu Zhu Pu Li |
| author_facet | Yang Liu Qi Yuan Guangyu Zhu Pu Li |
| author_sort | Yang Liu |
| collection | DOAJ |
| description | The rotor is the core component of a gas turbine, and more than 80% of the failures in gas turbines occur in the rotor system, especially during the start-up period. Therefore, the safety assessment of the rotor during the start-up period is essential for the design of the gas turbine. In this paper, the transient equivalent stress of a gas turbine rotor under the cold start-up condition is investigated and the novel tie rod structure is introduced to reduce the equivalent stress. Firstly, a three-dimensional finite element model of the gas turbine rotor is built, and nonlinear contact behaviors such as friction are taken into account. Secondly, the convective heat transfer coefficients of the gas turbine rotor under the cold start-up condition are calculated using thermal dynamic theory. The transient analysis of the gas turbine rotor is conducted considering the thermal load, the centrifugal load, and the pretightening force. The temperature and stress distributions of the rotor under the cold start-up condition are shown in detail. In particular, the generation mechanism of maximum equivalent stress for tie rods and the change tendency of the pretightening force are illustrated in detail. The tie rod holes of the rear shaft and the turbine tie rod are the dangerous locations during the start-up period. Finally, a novel tie rod is proposed to reduce the maximum equivalent stress at the dangerous location. The maximum equivalent stress at this location is decreased by 15%. This paper provides some reference for the design of the gas turbine rotor. |
| format | Article |
| id | doaj-art-2468740d900d473cb45cd1df86a9efe0 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-2468740d900d473cb45cd1df86a9efe02025-08-20T03:54:52ZengWileyShock and Vibration1070-96221875-92032018-01-01201810.1155/2018/10295201029520Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical MethodYang Liu0Qi Yuan1Guangyu Zhu2Pu Li3School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaSchool of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaThe rotor is the core component of a gas turbine, and more than 80% of the failures in gas turbines occur in the rotor system, especially during the start-up period. Therefore, the safety assessment of the rotor during the start-up period is essential for the design of the gas turbine. In this paper, the transient equivalent stress of a gas turbine rotor under the cold start-up condition is investigated and the novel tie rod structure is introduced to reduce the equivalent stress. Firstly, a three-dimensional finite element model of the gas turbine rotor is built, and nonlinear contact behaviors such as friction are taken into account. Secondly, the convective heat transfer coefficients of the gas turbine rotor under the cold start-up condition are calculated using thermal dynamic theory. The transient analysis of the gas turbine rotor is conducted considering the thermal load, the centrifugal load, and the pretightening force. The temperature and stress distributions of the rotor under the cold start-up condition are shown in detail. In particular, the generation mechanism of maximum equivalent stress for tie rods and the change tendency of the pretightening force are illustrated in detail. The tie rod holes of the rear shaft and the turbine tie rod are the dangerous locations during the start-up period. Finally, a novel tie rod is proposed to reduce the maximum equivalent stress at the dangerous location. The maximum equivalent stress at this location is decreased by 15%. This paper provides some reference for the design of the gas turbine rotor.http://dx.doi.org/10.1155/2018/1029520 |
| spellingShingle | Yang Liu Qi Yuan Guangyu Zhu Pu Li Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method Shock and Vibration |
| title | Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method |
| title_full | Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method |
| title_fullStr | Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method |
| title_full_unstemmed | Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method |
| title_short | Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method |
| title_sort | transient analysis and design improvement of a gas turbine rotor based on thermal mechanical method |
| url | http://dx.doi.org/10.1155/2018/1029520 |
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