Why draft tube is not required for impulse turbine?
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In an Impulse turbine, the Kinetic energy is used to rotate the blades. Here no device is needed to convert the kinetic energy to pressure energy because there is no loss of pressure. The inlet and outlet pressure remains the same.
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Draft Tube is a diverging tube fitted at the exit of runner of turbine and used to utilize the kinetic energy available with water at the exit of runner. '. This draft tube at the end of the turbine increases the pressure of the exiting fluid at the expense of its velocity. This means that the turbine can reduce pressure to a higher extent without fear of back flow from the tail race.
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