Study On Calculation Of Water Hammer Protection Of Long Distance And Large-scale Regional Water Gravitational Transportation Pipeline System

With development of city constructions and the improvement of people's living level, more and more large long distance water transfer projects appear, the safety of water transportation attracts people's attention.As an energy saving and efficient water transportation pipeline system, the safety of long distance and large-scale regional water gravitational transportation pipeline system also attracts people's attention.The effective measures to long distance and large-scale regional water gravitational transportation pipeline system are proposed by simulation of this type's water hammer protection in the article.In the paper, based on domestic and international developments ,the theory of numerical calculation of water hammer is shown, several boundary conditions of long distance and large-scale regional water gravitational transportation pipeline system are given. This paper outlines several of patterns of gas-liquid two-phase flow and pattern transformation on the basis of something studied from the forefathers in water pipeline and presser and harm of the water supply pipe clogged by gas. The best way of exhaust was studied. Structure principle, performance characteristic and technique essentials of common protective measures for water hammer is introduced, and points out some items requiring attention when choose protecting measures for water hammer. According to characteristic method in the hydraulic transients, building up the water hammer calculation mathematics model combined with all kinds of boundary conditions, wrote the visual program of water hammer calculation with the computer language, made use of the computer to carry on simulation calculation.Finally, take Dahuofang Reservoir in Liaoning Province water transportation project as the example, simulation calculation of water hammer protection is shown in long distance and large-scale regional water gravitational transportation pipeline system which has multiple branch. Based on the result of calculation, the best protective measure of long distance and large-scale regional water gravitational transportation pipeline system is shown by comparing with various protective measures of water hammer. It is a valuable reference to protect water hammer for similar engineering.