Guan'gai paishui xuebao (Feb 2024)

Responsive change in local resistances and adjacent influencing characteristics to the combined deformation of elbow and tee pipes

  • SHI Xi,
  • TIAN Yunxia,
  • GONG Li,
  • TAO Hu,
  • TAN Chunbin

DOI
https://doi.org/10.13522/j.cnki.ggps.2023121
Journal volume & issue
Vol. 43, no. 2
pp. 17 – 24

Abstract

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【Objective】 The objective of this paper is to explore the response of local resistance and adjacent influence characteristics to combined deformation of elbow and tee pipes in irrigation water transmission network. 【Method】 The combined deformation parts with different Reynolds number, tube diameter ratio, shunt ratio and relative spacing were numerically simulated using the k-ε model, from which we studied the variation in local resistance coefficient and adjacent influence coefficient, as well as the flow distribution with different relative spacings. 【Result】 The local resistance coefficient ζ01 of the curved pipe-vertical branch pipe and the local resistance coefficient ζ02 of curved pipe-horizontal branch pipe both decrease with the increase in the Reynolds number. With the increase in shunt ratio, both ζ01 and ζ02 decrease at first and then increase. With the increase in pipe diameter ratio, ζ01 and ζ02 decrease, especially ζ01. With the increase in relative spacing, ζ01 and ζ02 decrease at first and then increase. The adjacent influence coefficient C01 of the curved pipe-vertical branch pipe and the adjacent influence coefficient C02 of curved pipe-horizontal branch pipe also vary but differently with the Reynolds number, pipe diameter ratio, shunt ratio and relative spacing. C02 varies more than C01. It is shown that the degree of mutual influence in the horizontal direction is sensitive. The analysis of the flow field shows that the changes in the local resistance coefficient and the adjacent influence coefficient depend on the development of secondary flow in the curved pipe and interaction of the eddy current in the vertical branch and the horizontal branch. 【Conclusion】 Shunt ratio, pipe diameter ratio and relative spacing are the main factors influencing local resistance and adjacent influence of elbow and tee combined deformation parts.

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