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<p>To address the overly conservative control system design for multiple combustion chamber dual fuel pre-cooled variable cycle engines, which limits engine performance under certain operating conditions, an online optimization control method tailored to various working states is explored. Building on traditional optimization variables, a multivariable online optimization approach using the dual-fuel ratio and adjustable low-pressure turbine guide vanes as key variables is proposed. Simulation results reveal that the constraints affecting the engine’s maximum performance output are consistent at the same Mach number across different performance modes. In the low altitude, low Mach number working envelope, the low-pressure rotor correct speed of the engine is the key factor limiting its maximum state performance output under different performance modes, and improving the fan’s working performance can significantly enhance the engine’s maximum state performance within this working envelope. The multivariable online optimization method significantly enhances engine performance at maximum output, with a 5% variation limit on adjustable parameters, maximum thrust increases by 8.8%, turbine inlet temperature decreases by 91.5&#xa0;K, fuel consumption drops by 5.7%, and exergy efficiency improves by 17.1%. However, the method raises the CDFS surge margin constraint limit. These findings provide valuable insights for designing performance mode control systems in multi-combustion chamber variable cycle engines.</p>

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Thermodynamic Performance Online Optimization and Constraint Analysis of a Multi-Combustion Chamber Pre-Cooled Variable Cycle Engine

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Changpeng Cai,
  • Yabing Liu,
  • Qiangang Zheng,
  • Haibo Zhang

摘要

To address the overly conservative control system design for multiple combustion chamber dual fuel pre-cooled variable cycle engines, which limits engine performance under certain operating conditions, an online optimization control method tailored to various working states is explored. Building on traditional optimization variables, a multivariable online optimization approach using the dual-fuel ratio and adjustable low-pressure turbine guide vanes as key variables is proposed. Simulation results reveal that the constraints affecting the engine’s maximum performance output are consistent at the same Mach number across different performance modes. In the low altitude, low Mach number working envelope, the low-pressure rotor correct speed of the engine is the key factor limiting its maximum state performance output under different performance modes, and improving the fan’s working performance can significantly enhance the engine’s maximum state performance within this working envelope. The multivariable online optimization method significantly enhances engine performance at maximum output, with a 5% variation limit on adjustable parameters, maximum thrust increases by 8.8%, turbine inlet temperature decreases by 91.5 K, fuel consumption drops by 5.7%, and exergy efficiency improves by 17.1%. However, the method raises the CDFS surge margin constraint limit. These findings provide valuable insights for designing performance mode control systems in multi-combustion chamber variable cycle engines.