'Calculate the maximum efficiency of Pelton turbine using velocity diagram:'
Added by Thomas P.
Step 1
First, we need to find the relative velocity (Vr) of the water jet striking the bucket. This can be calculated using the formula: Vr = V1 - u where V1 is the absolute velocity of the water jet and u is the tangential velocity of the bucket. Show more…
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A Pelton turbine runs at 600 rpm and is directly coupled to a generator producing 3000 kW of power. Water level in the supply reservoir is 266 m above the centerline of the nozzle which has a Cv=0.98. A head loss of 16 m is estimated for the penstock. Assuming a generator efficiency of 92%, and overall turbine efficiency of 91%, and that a speed ratio of 0.47 gives the maximum efficiency, determine i. The volume flow rate through the turbine ii. The jet diameter at rated output iii. The bucket pitch circle diameter (Pelton wheel diameter)
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In a Pelton-wheel turbine, a stream of water is deflected by a series of blades so that the rate at which water is deflected by the blades is equal to the rate at which water issues from the nozzle $\Delta m / \Delta t=$ $A \rho v_{d}$. Using the same notation as in Sample Prob. $14.8,(a)$ determine the velocity $V$ of the blades for which maximum power is developed, $(b)$ derive an expression for the maximum power, $(c)$ derive an expression for the mechanical efficiency.
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Derive an expression for the blade efficiency in a reaction turbine that has four stages by means of flow and blade velocities with exit and entrance angles of moving blades if: the nozzle angle is equal to twice the exit angle of the moving blade, while the outlet relative velocity is equal to the absolute velocity. If the efficiency of any stage is 90%, what is the total efficiency of this turbine?
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