Analysis of Cavitation Instabilities in a Four-Blade Inducer

<table>Zoom on the signals of <svg height="18.362499" id="M210" style="vertical-align:-5.76984pt" version="1.1" viewbox="0 0 18.2125 18.362499" width="18.2125" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><use xlink:href="#x1D439"></use></g>
<g transform="matrix(.012,-0,0,-.012,10.637,15.188)"><use xlink:href="#x1D466"></use></g>
</svg> (in blue) and <svg height="15.4875" id="M211" style="vertical-align:-3.4671pt" version="1.1" viewbox="0 0 17.25 15.4875" width="17.25" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><use xlink:href="#x1D439"></use></g>
<g transform="matrix(.012,-0,0,-.012,10.637,15.187)"><use xlink:href="#x1D467"></use></g>
</svg> (in green), 1.18 <svg height="15.6875" id="M212" style="vertical-align:-3.39066pt" version="1.1" viewbox="0 0 19.775 15.6875" width="19.775" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.4)"><use xlink:href="#x1D444"></use></g>
<g transform="matrix(.012,-0,0,-.012,13.113,15.475)"><use xlink:href="#x1D45B"></use></g>
</svg>, <svg height="15.4" id="M213" style="vertical-align:-3.39064pt" version="1.1" viewbox="0 0 28.4375 15.4" width="28.4375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><use xlink:href="#x1D441"></use></g>
<g transform="matrix(.012,-0,0,-.012,14.925,15.187)"><use xlink:href="#x72"></use></g><g transform="matrix(.012,-0,0,-.012,19.185,15.187)"><use xlink:href="#x65"></use></g><g transform="matrix(.012,-0,0,-.012,24.242,15.187)"><use xlink:href="#x66"></use></g>
</svg>, and low pass filter with cut-off frequency 400 Hz.</table>

International Journal of Rotating Machinery

Analysis of Cavitation Instabilities in a Four-Blade Inducer

Figure 15