Aerothermodynamics

Multi-Fidelity Simulation of Gas Turbine Overall Performance by Directly Coupling High-Fidelity Models of Multiple Rotating Components

  • DENG Weimin ,
  • XU Yibing ,
  • NI Ming ,
  • WEI Zuojun ,
  • GAN Xiaohua ,
  • REN Guangming
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  • 1. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, China
    2. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
    3. Shenzhen Key Laboratory of Wide-Speed-Range and Variable-Density Continuous Wind Tunnel, Shenzhen Science and Technology Innovation Committee, Shenzhen 518000, China

Online published: 2024-07-15

Supported by

This research was funded by the Science and Technology Innovation Committee Foundation of Shenzhen, Grant No. JCYJ20200109141403840 and Grant No. ZDSYS20220527171405012, and the National Natural Science Foundation of China (NSFC), Grant No. 52106045.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

Multi-fidelity simulations incorporate computational fluid dynamics (CFD) models into a thermodynamic model, enabling the simulation of the overall performance of an entire gas turbine with high-fidelity components. Traditional iterative coupled methods rely on characteristic maps, while fully coupled methods directly incorporate high-fidelity simulations. However, fully coupled methods face challenges in simulating rotating components, including weak convergence and complex implementation. To address these challenges, a fully coupled method with logarithmic transformations was developed to directly integrate high-fidelity CFD models of multiple rotating components. The developed fully coupled method was then applied to evaluate the overall performance of a KJ66 micro gas turbine across various off-design simulations. The developed fully coupled method was also compared with the traditional iterative coupled method. Furthermore, experimental data from ground tests were conducted to verify its effectiveness. The convergence history indicated that the proposed fully coupled method exhibited stable convergence, even under far-off-design simulations. The experimental verification demonstrated that the multi-fidelity simulation with the fully coupled method achieved high accuracy in off-design conditions. Further analysis revealed inherent differences in the coupling methods of CFD models between the developed fully coupled and traditional iterative coupled methods. These inherent differences provide valuable insights for reducing errors between the component-level model and CFD models in different coupling methods. The developed fully coupled method, introducing logarithmic transformations, offers more realistic support for the detailed and optimal design of high-fidelity rotating components within the overall performance platform of gas turbines.

Cite this article

DENG Weimin , XU Yibing , NI Ming , WEI Zuojun , GAN Xiaohua , REN Guangming . Multi-Fidelity Simulation of Gas Turbine Overall Performance by Directly Coupling High-Fidelity Models of Multiple Rotating Components[J]. Journal of Thermal Science, 2024 , 33(4) : 1357 -1378 . DOI: 10.1007/s11630-024-1975-3

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