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The ejector nozzle connects the third bypass stream and core engine airflow of the Adaptive Cycle Engine (ACE), serving as a key component for achieving ACE’s bypass ratio adjustment and performance advantages. To optimize the matching performance between ACE and the ejector nozzle, this paper proposes a hybrid dimensional simulation method for ACE ejector nozzles aimed at achieving optimal installation performance. The method constructs a surrogate model through low-confidence CFD model sampling, and integrates it with high-confidence CFD models for installation performance optimization, ensuring that the ejector nozzle achieves optimal installation performance under various operating conditions. The focus of the study is on enhancing engine installation thrust and reducing aft-body drag by optimizing nozzle geometry and control laws, particularly under transonic conditions. The simulation results demonstrate that using maximum installation thrust as the optimization goal significantly improves installation thrust and reduces aft-body drag, especially near transonic conditions. This study provides an effective simulation method and theoretical basis for the control law design of ACE ejector nozzle.

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Multi-fidelity Simulation of Adaptive Cycle Engine Ejector Nozzle for Optimal Installation Performance

  • 会议论文

  • 发表日期：

    2026年

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  • Zian Wang,
  • Min Chen,
  • Zhewen Xu,
  • Hailong Tang,
  • Jiyuan Zhang,
  • Jia Han,
  • Yihao Xu

摘要

The ejector nozzle connects the third bypass stream and core engine airflow of the Adaptive Cycle Engine (ACE), serving as a key component for achieving ACE’s bypass ratio adjustment and performance advantages. To optimize the matching performance between ACE and the ejector nozzle, this paper proposes a hybrid dimensional simulation method for ACE ejector nozzles aimed at achieving optimal installation performance. The method constructs a surrogate model through low-confidence CFD model sampling, and integrates it with high-confidence CFD models for installation performance optimization, ensuring that the ejector nozzle achieves optimal installation performance under various operating conditions. The focus of the study is on enhancing engine installation thrust and reducing aft-body drag by optimizing nozzle geometry and control laws, particularly under transonic conditions. The simulation results demonstrate that using maximum installation thrust as the optimization goal significantly improves installation thrust and reduces aft-body drag, especially near transonic conditions. This study provides an effective simulation method and theoretical basis for the control law design of ACE ejector nozzle.