A vertical shaft Kaplan turbine operating under a head of 9.8 m has a runner diameter...

A vertical shaft Kaplan turbine operating under a head of 9.8 m has a runner diameter of 9.3 m. At the maximum optimum point, the turbine runs at 51.7 rpm and develops 45,000 kW power discharging 535 m 3 /s water. Determine the values of unit speed, unit discharge, unit power and specific speed of the turbine. If the critical value of cavitation coefficient for the runner is 0.95, determine the location of the runner with respect to the tail race water level. The atmospheric and saturated vapour pressures may be taken as 9.8 m and 2.5 m respectively. Will the runner be located below or above the tail race water level? [ 59 . 153 ? u N , 989 . 1 ? u Q , 96 . 16 ? u P , 51 . 632 ? s N , 01 . 2 ? ? s H , below] 2. Calculate the diameter, speed and specific speed of a propeller turbine runner to develop 6,250 kW under a head of 5 m, given that the speed ratio Ku based on the outer diameter is 2.10, flow ratio ?=0.65. Assume the diameter of the boss (hub) is 0.35 times the external diameter of the runner and overall efficiency is 85 %. [D = 5.81 m, N = 68.37 rpm, Ns= 722.93] 3. A hydraulic turbine develops 130 kW at 230 rpm under a head of 16 m. Determine the scale ratio and the speed of a similar machine which will generate 660 kW when working under a head of 25 m. [Scale ratio (D2/D1) = 1.612, N2 = 178.35 rpm]

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samet mamat answered 1 year ago

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