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Transient Analysis and Design Improvement of a Gas Turbine Rotor Based on Thermal-Mechanical Method
- Source :
- Shock and Vibration, Vol 2018 (2018)
- Publication Year :
- 2018
- Publisher :
- Hindawi Limited, 2018.
-
Abstract
- 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.
- Subjects :
- Materials science
Article Subject
Convective heat transfer
020209 energy
Tie rod
02 engineering and technology
engineering.material
Turbine
law.invention
Stress (mechanics)
0203 mechanical engineering
law
0202 electrical engineering, electronic engineering, information engineering
Civil and Structural Engineering
Rotor (electric)
Mechanical Engineering
Mechanics
Geotechnical Engineering and Engineering Geology
Condensed Matter Physics
Finite element method
lcsh:QC1-999
020303 mechanical engineering & transports
Mechanics of Materials
engineering
Transient (oscillation)
Helicopter rotor
lcsh:Physics
Subjects
Details
- Language :
- English
- ISSN :
- 18759203 and 10709622
- Volume :
- 2018
- Database :
- OpenAIRE
- Journal :
- Shock and Vibration
- Accession number :
- edsair.doi.dedup.....06c9349df8f46f986eabf94fc86ed80c