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A hybrid electric propulsion scheme research on a recuperated gas turbine with a vaneless counter-rotating turbine

Author

Listed:
  • Wang, Tao
  • Chi, Gen
  • Zhang, Hua-liang
  • Zhang, Yu
  • Qian, Ye-jian

Abstract

A vaneless counter-rotating turbine (VCRT) aggravates an efficiency degradation problem under off-design conditions due to the deteriorated rotational speed matching of VCRT. An innovative hybrid electric propulsion system (HEPS) introduces variable power offtakes/inputs of high- and low-pressure shafts (HPS and LPS) for decoupling rotational speeds of VCRT from the gas turbine load. The HEPS is applied in a recuperated gas turbine with VCRT for improving efficiency under partial loads. A decoupling control scheme is designed for optimizing VCRT flow field under off-design working conditions. The optimum decoupling control scheme keeps the outlet temperature of the combustor constant at maximum allowable value under various loads, which brings a significant decrease in the combustor exergy loss. The HEPS reverses the efficiency deterioration trend with the gas turbine load decreasing. The thermal efficiency gain increases from 3.4 % to 12.62 % with the load decreasing from 100 % to 40 % compared to the original recuperated gas turbine with VCRT. The reduction of specific fuel consumption (SFC) reaches up to 31.2 % under 40 % of load.

Suggested Citation

  • Wang, Tao & Chi, Gen & Zhang, Hua-liang & Zhang, Yu & Qian, Ye-jian, 2025. "A hybrid electric propulsion scheme research on a recuperated gas turbine with a vaneless counter-rotating turbine," Energy, Elsevier, vol. 316(C).
    • Handle: RePEc:eee:energy:v:316:y:2025:i:c:s0360544225000441
    DOI: 10.1016/j.energy.2025.134402
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