Volume 33 Issue 12
Dec.  2018
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Simulation of windmilling-ram mode performance for tandem TBCC engine[J]. Journal of Aerospace Power, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.014
Citation: Simulation of windmilling-ram mode performance for tandem TBCC engine[J]. Journal of Aerospace Power, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.014

Simulation of windmilling-ram mode performance for tandem TBCC engine

doi: 10.13224/j.cnki.jasp.2018.12.014
  • Received Date: 2018-02-26
  • Publish Date: 2018-12-28
  • The windmilling-ram mode performance simulation model was developed for a tandem turbine-based combined cycle (TBCC) engine based on the matching of the component low-speed characteristics. Extrapolation method for the compressor characteristics at low-speed and high flow region was proposed, and the issues associated with the component efficiency discontinuity at low speeds were solved through substitution of isentropic efficiency by corrected torque while describing the characteristics map of rotational component. Influence of ram bypass area variation and turbine power offtake on the windmilling-ram mode performance and component matching was analyzed, and parameter regulating laws during mode transition, including the windmilling-ram mode, were investigated based on the smooth variation of engine thrust and airflow. The simulation results showed that: under the windmilling-ram mode, the fan operation was strongly related to the ram bypass area variation, exerting a relatively small influence on the compressor operation; with the increase of the windmilling spool speed, turbine power offtake first rose and then dropped, and the specific impulse was linearly reduced with the increase of turbine power offtake, while the power offtake location of high-pressure or low-pressure turbine had a significant influence on the component matching.

     

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