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project2

# project2 - results by TranSAM(d Plot pressure head history...

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PROJECT- Water-hammer CIVIL 252, 2002 By M.S. Ghidaoui Due date: 4:00-5:00pm 10/5/2002 (Hydraulic Lab) A steady flow has been established from the upstream reservoir to the downstream reservoir through a pipe. The parameters are given: Upstream Reservoir: Elevation of bottom 50m, Depth 11.4m Downstream Reservoir: Elevation of bottom 50m, Depth 11.0m. Pipe: Length 1000m, Diameter 0.254m, Friction factor 0.02, located in the plan at elevation of 50m. (a) Calculate the steady state condition. That is, flowrate, velocity in the pipe. There is a valve connect to the pipe and the downstream reservoir. Water hammer is triggered at time t=3s, by closing the valve in very short time (Considered as sudden closure). Wave speed is 1000m/s. (b) Watch the animation; summarize the reflection property at the constant head reservoir (Upstream), and at the closed valve (downstream). (c) Calculated the water-hammer pressure by Joukowsky relation. Compare it to the
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Unformatted text preview: results by TranSAM. (d) Plot pressure head history at the valve (meaning the upstream side), Of course, you should use the output of TranSAM. Indicate the period of water-hammer. (e) Plot pressure head history at the mid-length of the pipe; indicate the period of water-hammer. (f) Change wavespeed of water-hammer, plot pressure head history at the valve. Discuss the effect of wavespeed. (g) Change friction factor, plot the pressure head history at the valve. Discuss the effect of friction factor. (h) Add vapour cavitation in the model; explain the “irregular” pattern in the pressure history. Comment on Joukowsky relation for design of pipeline. (hint: change VAPCAV to 1, which turn on the vapour cavitation in the model, and the lowest pressure can not be lower than vapour pressure.)...
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