Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/ijrm/volume-2015/641601/figures/641601.fig.005a.svgz" name="641601.fig.005a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Original time series</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/ijrm/volume-2015/641601/figures/641601.fig.005b.svgz" name="641601.fig.005b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Wavelet power spectrum</td></tr></table>

<div>Wavelet analysis of unsteady data segment of four sensors of rotor-1 at near stall mass flow (point B) for speed combination of 2400–2200 RPM.</div>

International Journal of Rotating Machinery

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Figure 5

Figure 5: Experimental Investigation of Stall Inception Mechanisms of Low Speed Contra Rotating Axial Flow Fan Stage 