A study on acoustic noise and flow rate from two tandem tubeaxial fans

ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258) Pub Date : 2002-08-07 DOI:10.1109/ITHERM.2002.1012476

S. W. Miller, D.G. Wang

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引用次数: 1

Abstract

Stacking two tubeaxial fans in series can simultaneously achieve fan redundancy, high airflow delivery and high packaging density. However, the impact of packing two fans together on overall noise emissions is far from well defined and much less well understood as compared to noise emission from isolated fans. This study demonstrates that spacing between two series fans has a significant impact on overall acoustic noise emissions. Using sound power measured for two tightly bolted 120 mm Nidec fans as a reference, a noise reduction of 5 dB can be achieved by separating two fans 40 mm apart when the air channel between two fans is enclosed. The overall sound power can further be reduced by nearly 3 dB when the channel between two series fans is open to ambient. The impact of open/closed channel and spacing on overall volumetric airflow is also investigated for normal operation and various fan failure scenarios. Flow degradation becomes obvious only in certain fan failure scenarios with the biggest impact observed for downstream fan failure with its fan blades locked at the maximum spacing.

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串联式双管轴流风机的噪声与流量研究

两台管轴风机串联堆叠，可同时实现风机冗余、大气流输送和高包装密度。然而，与孤立风扇的噪声排放相比，将两个风扇包装在一起对总体噪声排放的影响远没有很好地定义，也没有很好地理解。本研究表明，两个系列风机之间的间距对总体声噪声发射有显著影响。以两台螺栓紧固的120 mm Nidec风扇的声功率为参考，当两台风扇之间的风道被封闭时，将两台风扇分开40 mm，可实现5db的降噪。当两个系列风扇之间的通道对环境开放时，整体声音功率可以进一步降低近3db。在正常运行和各种风扇故障情况下，还研究了开/闭通道和间距对总体容积气流的影响。只有在某些风扇故障情况下，流量退化才会变得明显，其中对下游风扇故障的影响最大，风扇叶片锁定在最大间距。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ITherm 2002. Eighth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (Cat. No.02CH37258)

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