Study On The Way To Waterhammer Protection In Long Distance And Heavy Calibre Of Flow Flat Water Supply Pipe

With the development of the economy, long distance and large-scale water delivery cascade pumping stations are begin to be built. In the long distance water supply pipe construction project, the most outstanding problem is how to protect the pipe. Therefore, in order to guarantee security of the running of the water supply system, It is necessary to make water hammer analysis. According to actual characteristic of water hammer occur,the safe, reliable, effectively and economic measure of preventing water hammer is designed.On the research of water hammer protection in long distance and heavy calibre of flow flat water supply pipe,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. Then give a deeper analysis about the structure principle and performance characteristic and technique essentials of the common protective equipments for water hammer. and discuss that what equipments is demanded in order to alleviate water-hammer in long distance water supply program, and points out some items requiring attention when choose protecting measures for water hammer.In the paper, method of characteristics which is widely used in numerical calculation of water hammer is shown. The capacity of equipment to alleviate waterhammer is considered in using "Method of characteristics", boundary conditions of water pump under different work conditions and common water hammer protective measures are given. It's important to distinguish the capacity difference of the equipment for the project designer. For example, there is different gas vent valve, and there are different boundary conditions. According to characteristic method, built 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 Yingkou Shimen and Huludao Longyuan and Dahuofang Liaoning province of water hammer of the pipelines as the example, simulation calculation of water hammer protection. Based on the result of calculation, various protective measures of water hammer of cavities collapsing is compared with. Different water hammer protective measures have different effects is verified. It was a greatly help to made alleviate water hammer scheme in these power plant, and it can be chosen to similar project.