An analysis of the impact of valve closure time on the course of water hammer

• Autorzy: Kodura A.

Identyfikatory

DOI

10.1515/heem-2016-0003

• Języki publikacji: EN

Abstrakty

EN

The knowledge of transient flow in pressure pipelines is very important for the designing and describing of pressure networks. The water hammer is the most common example of transient flow in pressure pipelines. During this phenomenon, the transformation of kinetic energy into pressure energy causes significant changes in pressure, which can lead to serious problems in the management of pressure networks. The phenomenon is very complex, and a large number of different factors influence its course. In the case of a water hammer caused by valve closing, the characteristic of gate closure is one of the most important factors. However, this factor is rarely investigated. In this paper, the results of physical experiments with water hammer in steel and PE pipelines are described and analyzed. For each water hammer, characteristics of pressure change and valve closing were recorded. The measurements were compared with the results of calculations perfomed by common methods used by engineers – Michaud’s equation and Wood and Jones’s method. The comparison revealed very significant differences between the results of calculations and the results of experiments. In addition, it was shown that, the characteristic of butterfly valve closure has a significant influence on water hammer, which should be taken into account in analyzing this phenomenon. Comparison of the results of experiments with the results of calculations? may lead to new, improved calculation methods and to new methods to describe transient flow.

Słowa kluczowe

EN

time of valve closure; butterfly valve; pressure characteristic; transient flow; water hammer

• Wydawca: Institute of Hydro-Engineering of Polish Academy of Sciences
• Czasopismo: Archives of Hydro-Engineering and Environmental Mechanics
• Rocznik: 2016
• Tom: Vol. 63, nr 1
• Strony: 35--45
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Kodura A.

• Warsaw University of Technology, Faculty of Building Services Hydro and Environmental Engineering, Nowowiejska 20, 00-653 Warsaw, Poland

Bibliografia

• Ilin J. A. (1987) Calculations of water systems, Stroizdat, Moscow (in Russian).
• Kodura A. (2011) Influence of characteristic of ball valve closing on water hammer run, Proceedings of the Twelfth International Symposium on Water Management and Hydraulic Engineering, Gdańsk, Poland.
• Marcinkiewicz J., Adamowski A., Lewandowski M. (2008) Experimental evaluation of ability of Relap5, Drako, Flowmaster2TM and program using unsteady wall friction model to calculate water hammer loadings on pipelines, Nucl Eng Des, 238, (8), 2084–2093 doi:10.1016/j.nucengdes.2007.10.027.
• Mitosek M. (2007) Fluid Mechanics in Environmental Engineering, WNT Warsaw, (in Polish).
• Pires L. F. G., Laidea R. C. C., Baretto C. V. (2004) Transient Flow Analysis of Fast Valve Closure in Short Pipelines, Proceedings of International Pipeline Conference, October 4–8, 2004, Calgary, Alberta, Canada.
• Ramos H., de Almeida B. A. (2002) Parametric Analysis of Water Hammer Effects in Small Hydro Schemes, Journal of Hydraulic Engineering, 128 (7), pp. 689–696.
• Streeter V. L., Wylie B. E., Bedford K. W. (1998) Fluid Mechanics, WCB McGraw-Hill, New York.
• Thorley A. R. D. (2004) Fluid transients in pipeline system: a guide to the control and suppression of fluid transients in liquids in closed conduits, ASME Press, New York.
• Wood D. J., Jones S. E. (1973) Water-hammer charts for various types of valves, Journal of Hydraulic Division, 99 (1), 167–178.
• Wylie B. E., Streeter V. L., Suo L. (1993) Fluid Transients in Systems, Englewood Hills New Jersey, Prentice Hall.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.