Experimental Characterisation of the Far-Field Noise in Axial Fans Fitted with Shaped Tip End-Plates

<table>Comparison of A-filtered overall sound power level (<svg height="14.7" id="M16" style="vertical-align:-3.21404pt" version="1.1" viewbox="0 0 53.349998 14.7" width="53.349998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.7)">
<g transform="translate(72,-60.24)">
<text transform="matrix(1,0,0,-1,-71.95,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑂</tspan>
<tspan style="font-size: 12.50px; " x="9.1521959" y="0">𝐿</tspan>
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<text transform="matrix(1,0,0,-1,-53.95,60.37)">
<tspan style="font-size: 8.75px; " x="0" y="0">𝑤</tspan>
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<text transform="matrix(1,0,0,-1,-46.66,63.5)">
<tspan style="font-size: 12.50px; " x="0" y="0">(</tspan>
<tspan style="font-size: 12.50px; " x="4.1634989" y="0">𝐴</tspan>
<tspan style="font-size: 12.50px; " x="13.12815" y="0">)</tspan>
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</g>
</g>
</svg>) − specific noise level (<svg height="14.3625" id="M17" style="vertical-align:-3.2316pt" version="1.1" viewbox="0 0 17.475 14.3625" width="17.475" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,14.3625)">
<g transform="translate(72,-60.51)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝐾</tspan>
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<text transform="matrix(1,0,0,-1,-62.42,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">𝑠</tspan>
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</svg>) polar plot.</table>

International Scholarly Research Notices

fig5

Figure 5

Figure 5: Experimental Characterisation of the Far-Field Noise in Axial Fans Fitted with Shaped Tip End-Plates 