Experimental investigation of the influence of different leading edge modifications on the sound emission of axial fans downstream of a heat exchanger
Experimental investigation of the influence of different leading edge modifications on the sound emission of axial fans downstream of a heat exchanger
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DOI：
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发表时间：
2019
期刊：
影响因子：
2.5
通讯作者：
Felix Czwielong;S. Becker
中科院分区：
文献类型：
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作者：
Felix Czwielong;S. Becker
轴流风机对技术系统的声发射有很大影响。低压轴流风机的常见应用之一是在空调和冷却回路中的应用。在该方案中，在大多数情况下，风扇在热交换器的下游运行。吸气侧换热器改变了风机的上游流场，经常导致轴流风机的声压级比未受干扰的流入条件下的声压级增加。对翼型声辐射的研究表明，锯齿或缝隙等前缘改型可以降低湍流-翼型干扰噪声。在这项研究中，研究了两种不同的前缘改型(正弦和狭缝)对前倾低压轴流风机声发射的影响。进气条件在自由进流和扰动进流之间变化，由位于轴流风扇吸力侧的换热器产生。结果表明，在上述两种进气条件下，前缘的改变对轴流风机的声辐射都有积极的影响。
Axial fans have a major impact on the sound emission of technical systems. One of the common applications of low-pressure axial fans is their usage in air conditioning and cooling circuits. In most cases the fan operates downstream of a heat exchanger in this scheme. The suction side heat exchanger changes the upstream flow field of the fan, often resulting in an increase in the sound pressure level of the axial fan compared to undisturbed inflow conditions. Investigations on sound radiation of aerorfoils showed that leading-edge modifications like serrations or slits reduce the turbulence-aerofoil interaction noise. In this study, the impact of two different leading-edge modifications (sinusoidal and slit) on the sound emissions of a forward skewed low-pressure axial fan was examined. The inflow conditions varied between a free inflow and a disturbed inflow, generated by a heat exchanger located on the suction side of the axial fan. The results show that the modification of the leading edge has a positive influence on the sound radiation of the axial fan for both inlet conditions discussed above.