A Methodology for Assessing Axial Compressor Stability with Inlet Temperature Ramp Distortion

  • SUN Dakun ,
  • GU Benhao ,
  • NING Fangfei ,
  • FANG Yibo ,
  • DONG Xu ,
  • XU Dengke ,
  • SUN Xiaofeng
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  • 1. School of Energy and Power Engineering, Beihang University, Beijing 102206, China
    2. Research Institute of Aero-engine, Beihang University, Beijing 102206, China

Online published: 2024-04-30

Supported by

The research presented here is supported by National Natural Science Foundation of China (NSFC Grant Nos. 52306036,52325602), Science Center for Gas Turbine Project (P2022-A-II-002-001, P2022-C-II-003-001), Project funded by China Postdoctoral Science Foundation (2022M720346) and National Science and Technology Major Project (Y2022-II-0003-0006, Y2022-II-0002-0005). Also, the research is supported by the Key Laboratory of Pre-Research Management Centre (No. 6142702200101) and the Fundamental Research Funds for the Central Universities (YWF-23-Q-1009, YWF-23-Q-1065).

Copyright

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

Abstract

Based on a small perturbation stability model for periodic flow, the effects of inlet total temperature ramp distortion on the axial compressor are investigated and the compressor stability is quantitatively evaluated. In the beginning, a small perturbation stability model for the periodic flow in compressors is proposed, referring to the governing equations of the Harmonic Balance Method. This stability model is validated on a single-stage low-speed compressor TA36 with uniform inlet flow. Then, the unsteady flow of TA36 with different inlet total temperature ramps and constant back pressure is simulated based on the Harmonic Balance Method. Based on these simulations, the compressor stability is analyzed using the proposed small perturbation model.Further, the Dynamic Mode Decomposition method is employed to accurately extract pressure oscillations. The two parameters of the temperature ramp, ramp rate and Strouhal number, are discussed in this paper. The results indicate the occurrence and extension of hysteresis loops in the rows, and a decrease in compressor stability with increasing ramp rate. Compressor performance is divided into two phases, stable and limit, based on the ramp rate. Furthermore, the model predictions suggest that a decrease in period length and an increase in Strouhal number lead to improved compressor stability. The DMD results imply that for compressors with inlet temperature ramp distortion, the increase of high-order modes and oscillations at the rotor tip is always the signal of decreasing stability.

Cite this article

SUN Dakun , GU Benhao , NING Fangfei , FANG Yibo , DONG Xu , XU Dengke , SUN Xiaofeng . A Methodology for Assessing Axial Compressor Stability with Inlet Temperature Ramp Distortion[J]. Journal of Thermal Science, 2024 , 33(3) : 856 -871 . DOI: 10.1007/s11630-024-1961-9

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