INVESTIGATION OF MECHANISM IN DAMPING OF PRESSURE FLUCTUATION IN PIPELINE

Abstract

 It was suggested that presuure variation generated by water hammer attenuated larger as a location of leakage was closer to downstream end in an experiment pipe. The damping of pressure fluctuation is closely related with energy loss during transient event in a pipe, so the mechanism in danping of it was investigated by analyzing energy loss due to friction and leakage flow theoretically. Besides, the validity of this mechanism was verified by numerical simulation, method of characteristics. Consequently, it was turned out that daming curve of pressure fluctuation due to friction could be reproduced in error by less than 1 percent for initial pressure variation and that of pressure fluctuation due to leakage flow could be reproduced in error by about 1 percent for it during about 20 seconds after water hannmer was generated.