project4

project4 - period of water-hammer was decreased. (g) The...

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FUNG PAK HEY HENRY 00165654 ce_fph 10 th May 2002 CIVL252 PROJECT WATER-HAMMER (a) The steady state condition: s m vA Q s m v v g v D fL H H / 1600 . 0 4 254 . 0 3157 . 0 / 3157 . 0 81 . 9 2 254 . 0 1000 02 . 0 0 . 11 4 . 11 2 3 2 2 2 2 1 = × × = = = × × = - = - π (b) The waves were reflected in phase at the constant head reservoir (upstream), while the waves were reflected anti-phase at the closed valve (downstream). (c) The water-hammer pressure by Joukowsky relation: m g v a H 18 . 32 81 . 9 3157 . 0 1000 = = = The upstream water-hammer pressure by TranSAM = 31m The results were quite close. (d) The length was 1000m. The period of water-hammer = 4.2s
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FUNG PAK HEY HENRY 00165654 ce_fph 10 th May 2002 CIVL252 PROJECT WATER-HAMMER (e) The length was 500m. The period of water-hammer = 4.2s (f) The wavespeed was increased to 2000m/s. It could be observed by TranSAM that the water-hammer pressure was increased, and the
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Unformatted text preview: period of water-hammer was decreased. (g) The friction factor was increased to 0.05. It could be observed by TranSAM that the water-hammer pressure was decreased, and the period of water-hammer was not changed. (h) The irregular pattern in the pressure history was observed by TranSAM because of the superposition of the reflected wave and vapour cavitation in the model. Also, as the waves were traveling and the phases were changing. Thus, the waves were interacted together Therefore, the irregular pattern happened in the pressure history. Using Joukowsky relation is suitable for design of pipeline because it could prevent the breakage of the closed pipes....
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project4 - period of water-hammer was decreased. (g) The...

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