Experimental investigation of axial spacing effect on rotor-stator interaction tonal noise by in-duct measurements

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Tonal noise levels decrease significantly with reduced axial spacing, showing robust linear trends.
Sound pressure level for first blade-passing frequency drops within specified spacing limits, highlighting design considerations.
In-duct measurements were used to assess noise levels across various speeds and spacings, ensuring consistent inflow.
Results indicate that axial spacing affects tonal noise, pointing to the importance of fan design for optimal performance.

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Experimental investigation reveals axial spacing influences tonal noise in axial-flow fans, suggesting design improvements may be needed.

Yan et al. (2025) studied this question.

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