On the Rotor Stator Interaction Effects of Low Specific Speed Francis Turbines

Figure 4

Pressure sensors in the vaneless space and in the guide vane cascade. The angular distance between sensor S2-S3 and S3-S4 is 4.3°. The sensors were flush mounted in the upper cover of the turbine as shown with sensor S3 in section A-A. The distances from the runner blades leading edges to the sensors are 16.1mm and 30.6mm.