Read the below points: *if you consider the turbine to be an airfoil, then there is a low pressure region amd a high pressure region in every blade of the turbine *also the water outlet from the turbine is of low pressure, since it has given all its energy for the rotation.(bernoullis principle) *the decrease in pressure decreases the boiling point of the water,(according to thermodynamics) hence it gets converted into steam bubbles. *the hot steam bubbles collide with each other, producing impact forces on thw turbine blades, thus damaging the outlet of turbine. * Since,the pressure of tail race water>low pressure water from outlet, the tail race is fitted close to the outlet to decrease the pressure gradient, hence greatly decreasing the cavitation effect. *
Don't know if the concept is hard to understand or The English..! 😬
Read the below points:
*if you consider the turbine to be an airfoil, then there is a low pressure region amd a high pressure region in every blade of the turbine
*also the water outlet from the turbine is of low pressure, since it has given all its energy for the rotation.(bernoullis principle)
*the decrease in pressure decreases the boiling point of the water,(according to thermodynamics) hence it gets converted into steam bubbles.
*the hot steam bubbles collide with each other, producing impact forces on thw turbine blades, thus damaging the outlet of turbine.
* Since,the pressure of tail race water>low pressure water from outlet,
the tail race is fitted close to the outlet to decrease the pressure gradient, hence greatly decreasing the cavitation effect.
*
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