According to the working principle, turbines can be divided into two major categories: impact turbines and counter-turbine turbines.
The runner of the impact turbine is rotated by the impact of the water flow. The pressure of the water flow during the working process is constant, mainly the conversion of kinetic energy; the runner of the counter-turbine turbine is rotated by the reaction force of the water flow in the water. The pressure energy and kinetic energy of the water flow change during the work, but mainly the conversion of pressure energy.
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