The draft tube in a reaction turbine (Francis/Kaplan) is used to:
Choose the correct answer
Increase the inlet velocity to the turbine
Recover the kinetic energy at the turbine exit and allow installation above tailwater level
Reduce cavitation at the inlet
Direct water from penstock to turbine
Correct Answer
B. Recover the kinetic energy at the turbine exit and allow installation above tailwater level
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Draft tube converts the kinetic energy of water leaving the turbine runner into pressure energy before discharging to tailrace. It allows the turbine to be installed above tailwater level (up to cavitation limit), improving plant layout.
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