A Kaplan turbine develops 1500 kW under a head of 6 m. The turbine is set 2.7 m above the tailrace while the draft tube is immersed 0.5 m under the tailrace. A vacuum gauge, inserted at the turbine outlet, records a suction head of 3.1 m. If the efficiency of turbine is 85 %, what will be the efficiency of draft tube that has inlet diameter of 3 m? Assume losses in the draft tube is 0.2 m. Take draft tube efficiency as 2g 2g V,? 2g

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