Flow-thermo-elastic coupled vibration characteristics of aeroengine high pressure rotor at the typical start and stop conditions

Wenjun Yang1 , Bobo Li2 , Lei Wang3 , Huiqun Yuan4

1, 2School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, China

1Materials Fatigue and Fracture Laboratory, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China

1, 3State Key Laboratory for Aviation Digital Manufacturing Process, Shenyang Aerospace University, Shenyang, China

4School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China

1Corresponding author

Journal of Vibroengineering, Vol. 21, Issue 6, 2019, p. 1533-1551. https://doi.org/10.21595/jve.2019.20470
Received 23 December 2018; received in revised form 14 April 2019; accepted 21 April 2019; published 30 September 2019

Copyright © 2019 Wenjun Yang, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract.

Based on the typical start and stop conditions of aeroengine high pressure rotor, the problem of flow-thermo-elastic coupling is solved in this research. Applying basic theory and control equation, it is analyzed the fields of transient temperature, thermal stress and thermal deformation in the start and stop process. Then the temperature at last stopping moment is selected as the boundary condition. With the flow-thermo-elastic coupling method, the distributions of air flow, heat transfer and temperature are discussed in high pressure rotor cavity. The results show the rotor has a higher temperature, and the density of temperature contour is much larger at the beginning of stop period. The temperature of each node gradually decreases as stop time increases. When the stop time is within 40-90 minutes, temperature difference between the upper and lower surfaces is larger than 20 °C. The distribution of transient temperature is different when restart process is taken at different stop moments. If the stop time is short, temperature distribution of the rotor is decreased firstly, then increased, and finally decreased. The time corresponding to the lowest temperature is also different in each node. It is the longest in the 3rd disk, and the shortest in the 8th disk.

Graphical Abstract

Highlights
  • With the flow-thermo-elastic coupling method, distributions of air flow, heat transfer and temperature are discussed.
  • The density of temperature contour is much larger at the beginning of stop period.
  • The distribution of transient temperature is different when restart process is taken at different stop moments.
  • If stop time is short, temperature distribution of the rotor is decreased firstly, then increased, and finally decreased.

Keywords: high pressure rotor, flow-thermo-elastic coupling, start and stop conditions, vibration characteristic, temperature distribution.

Acknowledgements

The work is supported by Natural Science Foundation of Liaoning Province (Grant No. 20180550880), Education Department Series Project of Liaoning Province (Grant No. L201746) and Young Doctor Scientific Research Foundation of College (Grant No. 17YB04).

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