Determine the axial length of the runner vanes at inlet

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Reference no: EM131056948

A Francis turbine operates at its maximum efficiency point at η0 = 0.94, corresponding to a power specific speed of 0.9 rad. The effective head across the turbine is 160 m and the speed required for electrical generation is 750 rpm. The runner tip speed is 0.7 times the spouting velocity, the absolute flow angle at runner entry is 72° from the radial direction, and the absolute flow at runner exit is without swirl. Assuming there are no losses in the guide vanes and the mechanical efficiency is 100%, determine

a. the turbine power and the volume flow rate;

b. the runner diameter;

c. the magnitude of the tangential component of the absolute velocity at runner inlet;

d. the axial length of the runner vanes at inlet.

Reference no: EM131056948

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