Difference between Inward flow and outward flow reaction hydro turbine

Energy of water

Inward flow reaction hydro turbine water enter at the outer periphery, flow inward and toward the centre of the turbine and discharges at the outer periphery

out ward flow reaction hydro turbine water enter at the inner periphery flow out ward and discharge at the outer periphery 

Centrifugal head imparted

Inward flow reaction hydro turbine negative centrifugal head reduce the relative velocity of water at the out let

out ward flow reaction hydro turbine positive Centrifugal head increase the relative velocity of water at the outlet 

Discharge

Inward flow reaction hydro turbine the  discharge does not increase

out ward flow reaction hydro turbine the discharge increase

Speed control

inward flow reaction hydro turbine easy and effective

out ward flow reaction hydro turbine very difficult

Tendency of the wheel to race

inward flow reaction hydro turbine  nil

out ward flow reaction hydro turbine if speed increase wheel tends to race

Suitability

inward flow reaction hydro turbine quite suitable for medium high speed best suitable for large output and units

out ward flow reaction hydro turbine quite suitable for low or medium heads

Application

inward flow reaction hydro turbine for power projects

out ward flow reaction hydro turbine practically obsolete