Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance

<div>Instantaneous illustration of the DM4 excitation. A sinusoidal signal with 2∗28 periods is divided into 30 equal segments. The intersection line for each segment represents the pressure in each of the 30 runner channels. By plotting a curve through the intersection points, the overall pressure with 4 diametral modes appears.</div>

Shock and Vibration

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Figure 2

Figure 2: Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance 