What question did this study set out to answer?

This study aims to explore how distorted airflow affects noise levels in high-speed ducted fans.

Analysis of aerodynamic noise characteristics of high-speed ducted fans under distorted inlet conditions

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Randomized trial investigates noise characteristics in ducted fans experiencing inlet distortion, suggesting design improvements.

This study aims to explore how distorted airflow affects noise levels in high-speed ducted fans.
Employs hybrid SST k – ω + LES numerical method alongside FW-H acoustic theory.
Examines three conditions: normal intake, 20% occlusion, and 40% occlusion.
Validates simulation results through experiments in a semi-anechoic chamber.
Average overall sound pressure level increases by 12.4 dB under 20% occlusion and 14.8 dB under 40% occlusion.
Fundamental blade passing frequency noise enhances by 10–15 dB on average, with localized peaks of 20–25 dB in certain directions.
Noise directivity changes from symmetrical to highly asymmetric, with increased contributions from duct casing noise.

Su et al. (2026) studied this question.

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