A hydroelectric scheme comprises an upper storage lake and a lower impounding reservoir connected by a tunnel of 2.4 km
Posted: Wed Apr 27, 2022 2:44 pm
- A Hydroelectric Scheme Comprises An Upper Storage Lake And A Lower Impounding Reservoir Connected By A Tunnel Of 2 4 Km 1 (74.66 KiB) Viewed 28 times
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A hydroelectric scheme comprises an upper storage lake and a lower impounding reservoir connected by a tunnel of 2.4 km total length internal finished diameter of 1.2 m and Hazen-Williams friction factor of 80. The tunnel delivers water to an on-line turbine hall at a normal operating rate of 2 m/s. A surge tank constructed within a circular shaft is positioned 100 m upstream of the impounding reservoir and has an internal finished diameter of 2400 mm. If the turbines experiences shutdown, compute the maximum 2 likely instantaneous water level within the surge tank by filling Table Q5. Use 10 sec time steps. Table Q5: Computation of Surge Pressures -dy Q Hf y Hry t V - dv t=time; v=velocity in pipe; Q=flow through pipe, dy=change in water level, H=headloss due to friction; y=water level below no-flow level; dv=change in velocity Explain the effect of timestep on the calculation of surge height in Q5(a).