Study On Influences Over Gas State To Impingement Wave Velocity

Currently with the rapid development of society, the local existing water resources hasfar cannot meet the demand of growing, so the cross-regional long distance water distributionproject has been widely used in the actual application. How effectively for water hammerprotection, so that the safety of long-distance water pipelines running smoothly is a majorissue in front of us. Impingement wave velocity is one of the important influence factors ofwater hammer, and is an important aspect of water hammer research. In this paper, on thebasis of existing research results, more detailed analysis discusses the influencing factors ofthe impingement wave velocity, especially for the different states of the gas pipeline and theeffect on the impingement wave velocity in theory has carried on the thorough discussion. Onthis basis of combining engineering examples, further study in different conditions aqueductsave gas in the state, the impingement wave velocity differences on water hammer boost.This paper first describes the general situation of China’s water resources, illustrates thesignificance of water hammer research work. Introduces the basic concept of water hammerand the study of relevant theories both at home and abroad. Then make a more detaileddiscussion about the theory of water hammer wave velocity and the main influencing factors.And on the basis, this article focuses on the impact of the state of the gas contained inpipe on the impingement wave velocity, these discussed in detail and in-depth analysis. Theimpact of different forms of the pipeline aerated to impingement wave velocity is difficult touse quantitative methods to analyze. This paper attempts to give several mathematical modelsto derive it.This paper take the Suifenhe third Water Treatment Plant water supply project and aXinjiang industrial garden pressure water conveyance project, for long distance waterconveyance when gravity flow and pressure flow under the condition of hydraulic transient isanalyzed and calculated, these have strong representative. The two engineering examples bothhave big diameter and low friction characteristics. Under the same working condition, considering different gas pipe state respectively, analyzes the cause of impingement wavevelocity difference’s impact on water hammer pressure. Composite gravity flow and pressureflow condition in the long distance water conveyance pipeline hydraulic transition calculatingresult, the gas state changes to impingement wave velocity, and have obvious effects on theCut-out bridge booster. In the calculation, given the three-containing gas under the conditionsof the water hammer wave velocity, which is analyzed and compared under the same workingconditions, and draw conclusions.This article research the different states of gas pipe for water hammer wave velocity, ithas a high reference value of the hydraulic transient process in this condition and furtheroptimization of water hammer protection measures in long distance water transfer project. Italso provides some basis for the influence on impingement wave velocity, when we furthersubdivide the state of gas in pipe.