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

Tao Wang, Gen Chi, Hua-liang Zhang, Yu Zhang and Ye-jian Qian

Energy, 2025, vol. 316, issue C

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.

Keywords: Vaneless counter-rotating turbine; Variable power offtakes/inputs; Hybrid electric propulsion; Decoupling control scheme; Off-design performance (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:316:y:2025:i:c:s0360544225000441

DOI: 10.1016/j.energy.2025.134402

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