The study on the tip clearance noise in circumferential skewed axial fan under off-designs conditions

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (17) : 64-67.

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The study on the tip clearance noise in circumferential skewed axial fan under off-designs conditions

JIN GuangYuan1, WU Yadong2, OU YANG Hua2, DU Zhaohui2

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Abstract

Tip-clearance noise induced by tip-leakage flow in axial flow fans, with the blades skewed circumferentially at angles of ±8.3°, was investigated under off-design conditions by dynamic pressure experiments in sound near-field and far-field. The characteristics of tip-clearance noise and the effect of circumferential skewed blades on tip-clearance noise are discussed by experimental results. The results reveal that as the flow rate decreases, the strength and transfer of tip leakage flow are changed by circumferntial skewed blades; in frequency domain of the near-field and far-field, the broadband frequency components of tip-clearance noise are observed and tend to increase in the low frequency domain, especially for circumferential forward-skewed blade; the effects of circumferential skewed blades on the directivity patterns of the far-field overall SPL at various flow rates are different; the SPL of forward-skewed blade at all directions distribute well than that of backward-skewed blade.

Key words

Circumferential skewed blade / Tip leakage flow / Tip-clearance noise / Off-designation

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JIN GuangYuan;WU Yadong;OU YANG Hua;DU Zhaohui. The study on the tip clearance noise in circumferential skewed axial fan under off-designs conditions [J]. Journal of Vibration and Shock, 2013, 32(17): 64-67