Question

A Francis turbine operates with the following data: Head: 100m; Flow rate 36 m3/s; Speed: 410rev/min; Outer radius of runner 0.6m; Absolute flow angle: 72◦; Velocity: 36m/s;Exit swirl angle: 0◦ Calculate the effective runner width (i.e. ignoring blockage) and relative flow angle at inlet, the power output and efficiency. Answers: 0.859 m,37.3◦,31.8 MW,90.0%

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