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Irrigation and Melioration

Abstract

The paper considers the general equation of fluid motion in the channels and the functional dependences of the hydraulic friction coefficient on the Reynolds number, relative roughness, and on the shape of the live section of the channel. Resistance formulas are given for the simplest cross-sectional shapes of channels and for channels with a more complex cross-sectional shape. To take into account the effect (on the pressure loss) of the channel cross-sectional shape and the presence of a flow with a free surface in it, additional correction factors are introduced (using the hydraulic radius concept) and be clarified as a result of the relevant experiments. The work also examined the patterns of hydraulic resistances in engine channels of the correct form of a live section with uniform fluid motion. Formulas of hydraulic resistance in machine channels of simple and complex outlines of the cross section are given.

First Page

37

Last Page

41

References

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M.Mamajonov, D.R.Bazarov, B.R.Uralov, G.U.Djumabaeva, and N.Rahmatov. «The impact of hydro-wear parts of pumps for operational efficiency of the pumping station». Journal of Physics: Conference Sereis. J.Phys.: Pp. 1-8. Conf.ser. 1425 (2020) 012123. doi:10.1088/1742- 6596/1425/1/012123 www.scopus.com.

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