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In the context of next-generation military aircraft, complex inlet geometries and aggressive maneuvers introduce pronounced inlet flow non-uniformities, which significantly affect downstream compressor performance and engine stability. Steady-state and dynamic distortions of total pressure at the Aerodynamic Interface Plane (AIP) are of critical concern, yet their comprehensive evaluation remains challenging due to high experimental costs, measurement limitations, and safety considerations. Against this backdrop, the chapter applies the Delayed Detached-Eddy Simulation (DDES) approach to achieve high-fidelity predictions of inlet distortion characteristics induced by baffle-type distortion simulators. Three baffle configurations are investigated: (1) a single crescent-shaped baffle; (2) an axial series arrangement of two crescent-shaped baffles; and (3) a circumferential multi-zone configuration of multiple sector-shaped baffles.The study systematically examines the effects of baffle depth and configuration on both steady-state and dynamic distortion indices, as well as their ratio. Results indicate that increasing baffle depth in both crescent-shaped and axial series configurations intensifies total pressure non-uniformities, elevating steady-state and dynamic distortion indices. However, the axial spacing in series arrangements can diminish this effect if chosen to be smaller than the recirculation zone length behind the upstream baffle. Conversely, in the circumferential multi-zone configuration, alterations in baffle depth have a comparatively limited impact on distortion indices, highlighting its inherent circumferential uniformity.By comparing numerical predictions with experimental data, the DDES approach demonstrates high fidelity in capturing both time-averaged and transient flow features, including complex separated regions and dynamic fluctuations. The resulting insight into the regulatory capabilities of different baffle configurations and their parameter sensitivities provides essential guidance for designing and refining future inlet distortion experiments. Consequently, these findings support more accurate distortion simulation in ground test facilities and foster improved understanding of inlet-distortion-induced compressor stability issues.

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Application of DES-Series Method in Inlet Distortion Generator Flow Field Analysis

  • 章节

  • 发表日期：

    2025年

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  • Ruiyu Li,
  • Limin Gao,
  • Lei Zhao

摘要

In the context of next-generation military aircraft, complex inlet geometries and aggressive maneuvers introduce pronounced inlet flow non-uniformities, which significantly affect downstream compressor performance and engine stability. Steady-state and dynamic distortions of total pressure at the Aerodynamic Interface Plane (AIP) are of critical concern, yet their comprehensive evaluation remains challenging due to high experimental costs, measurement limitations, and safety considerations. Against this backdrop, the chapter applies the Delayed Detached-Eddy Simulation (DDES) approach to achieve high-fidelity predictions of inlet distortion characteristics induced by baffle-type distortion simulators. Three baffle configurations are investigated: (1) a single crescent-shaped baffle; (2) an axial series arrangement of two crescent-shaped baffles; and (3) a circumferential multi-zone configuration of multiple sector-shaped baffles.The study systematically examines the effects of baffle depth and configuration on both steady-state and dynamic distortion indices, as well as their ratio. Results indicate that increasing baffle depth in both crescent-shaped and axial series configurations intensifies total pressure non-uniformities, elevating steady-state and dynamic distortion indices. However, the axial spacing in series arrangements can diminish this effect if chosen to be smaller than the recirculation zone length behind the upstream baffle. Conversely, in the circumferential multi-zone configuration, alterations in baffle depth have a comparatively limited impact on distortion indices, highlighting its inherent circumferential uniformity.By comparing numerical predictions with experimental data, the DDES approach demonstrates high fidelity in capturing both time-averaged and transient flow features, including complex separated regions and dynamic fluctuations. The resulting insight into the regulatory capabilities of different baffle configurations and their parameter sensitivities provides essential guidance for designing and refining future inlet distortion experiments. Consequently, these findings support more accurate distortion simulation in ground test facilities and foster improved understanding of inlet-distortion-induced compressor stability issues.