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

<table>Directivity map of the <svg height="16.237499" id="M35" style="vertical-align:-4.74141pt" version="1.1" viewbox="0 0 17.1625 16.237499" width="17.1625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,16.2375)">
<g transform="translate(72,-59.01)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝐿</tspan>
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<text transform="matrix(1,0,0,-1,-63.1,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">𝑝</tspan>
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</svg> far field autospectra for the <i>datum</i> fan.</table>

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fig7

Figure 7

Figure 7: Experimental Characterisation of the Far-Field Noise in Axial Fans Fitted with Shaped Tip End-Plates 