A Novel Aerodynamic Noise Reduction Method Based on Improving Spanwise Blade Shape for Electric Propeller Aircraft

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/ijae/volume-2019/3750451/figures/3750451.fig.009a.svgz" name="3750451.fig.009a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>500 rpm noise spectrum</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/ijae/volume-2019/3750451/figures/3750451.fig.009b.svgz" name="3750451.fig.009b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>1000 rpm noise spectrum</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/ijae/volume-2019/3750451/figures/3750451.fig.009c.svgz" name="3750451.fig.009c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>1500 rpm noise spectrum</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/ijae/volume-2019/3750451/figures/3750451.fig.009d.svgz" name="3750451.fig.009d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>2000 rpm noise spectrum</td></tr><tr class="fig-image" id="e"><td><object data="https://static.hindawi.com/articles/ijae/volume-2019/3750451/figures/3750451.fig.009e.svgz" name="3750451.fig.009e" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(e) </b>2200 rpm noise spectrum</td></tr></table>

<div>Noise spectrum in different speeds.</div>

International Journal of Aerospace Engineering

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Figure 9

Figure 9: A Novel Aerodynamic Noise Reduction Method Based on Improving Spanwise Blade Shape for Electric Propeller Aircraft 