How does Kaplan turbine operate?
The Kaplan turbine is an inward flow reaction turbine, which means that the working fluid changes pressure as it moves through the turbine and gives up its energy. Power is recovered from both the hydrostatic head and from the kinetic energy of the flowing water. The design combines features of radial and axial turbines. The inlet is a scroll-shaped tube that wraps around the turbine's wicket gate. Water is directed tangentially through the wicket gate and spirals on to a propeller shaped runner, causing it to spin. The outlet is a specially shaped draft tube that helps decelerate the water and recover kinetic energy. The turbine does not need to be at the lowest point of water flow as long as the draft tube remains full of water. A higher turbine location, however, increases the suction that is imparted on the turbine blades by the draft tube. The resulting pressure drop may lead to cavitation. Kaplan turbine efficiencies are typically over 90%, but may be lower in very low head applications.
How to Calculate Discharge through runner?
Discharge through runner calculator uses Volume Flow Rate = pi/4*(Outer Diameter of Runner^2-Diameter of Hub^2)*Flow Velocity at Inlet to calculate the Volume Flow Rate, The Discharge through runner formula is defined as the amount of fluid passing through the runner in a given unit of time. Volume Flow Rate is denoted by Q symbol.
How to calculate Discharge through runner using this online calculator? To use this online calculator for Discharge through runner, enter Outer Diameter of Runner (Do), Diameter of Hub (Db) & Flow Velocity at Inlet (Vfi) and hit the calculate button. Here is how the Discharge through runner calculation can be explained with given input values -> 42.14054 = pi/4*(3.5^2-1.75^2)*5.84.