Volume 40 Issue 9
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WANG Xinyi, ZHENG Qiangang, ZHANG Haibo. Study on turbofan engine full envelope acceleration control schedule based on similarity conversion of N-dot[J]. Journal of Aerospace Power, 2025, 40（9）：20240351 doi: 10.13224/j.cnki.jasp.20240351
Citation: WANG Xinyi, ZHENG Qiangang, ZHANG Haibo. Study on turbofan engine full envelope acceleration control schedule based on similarity conversion of N-dot[J]. Journal of Aerospace Power, 2025, 40（9）：20240351 doi: 10.13224/j.cnki.jasp.20240351
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Study on turbofan engine full envelope acceleration control schedule based on similarity conversion of N-dot

doi: 10.13224/j.cnki.jasp.20240351

  • College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

  • Received Date: 2024-05-30
    Available Online: 2024-12-14
    Abstract

  • To solve the problem that the rotor acceleration (N-dot) acceleration control schedule has insufficient applicability in the full envelope range, a full envelope acceleration control method based on similarity conversion N-dot was proposed. It was proved and verified that the steady-state similar conversion error of fan speed, compressor speed and turbine front temperature of the turbofan engine was small on total temperature line of fan inlet. Then, it was analyzed that N-dot can directly reflect the size of residual power to ensure high precision of dynamic process similarity conversion. A finite number of isotherm operating points covering the full operating envelope of the engine were selected, and the converted N-dot acceleration control schedule under different total temperature was constructed. By expanding the accelerated control schedule to work points on non-isothermal lines by linear interpolation of neighboring isotherms, the application of N-dot acceleration control method in full envelope was realized. The simulation results showed that compared with the traditional method on open-loop fuel-to-air ratio acceleration control schedule, the acceleration time of the proposed method was shortened by 5.31% and 10.32% at different operating points of the same isotherm, and the acceleration time of the non-isotherm operating point was shortened by 57.74%. The acceleration time of the full operating envelope was within 2.3—12.3 s and each parameter did not exceed the limit. The proposed method can satisfy the control requirements of rapidity and safety in the full envelope range of the engine.

     

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