HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

Method of determining the optimal coordinate domain in the measurement of water flows turbulence using lad-56 in rectangular channels

Vestnik MGSU 2/2016
  • Volgin Georgiy Valentinovich - Moscow State University of Civil Engineering (National Research University) (MGSU) 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation, Moscow State University of Civil Engineering (National Research University) (MGSU), ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kulikov Dmitriy Viktorovich - Institute of Thermophysics named after S.S. Kutateladze SB RAS junior research worker, Institute of Thermophysics named after S.S. Kutateladze SB RAS, 1 prospekt Akademika Lavrent’eva, Novosibirsk, 630090, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 106-115

One of the modern methods of the experimental investigation of water flows turbulence is the method of Laser Doppler Anemometry. At the present time a measuring system “LAD-056” (Russia) is operating in the laboratory of the Department of Hydraulics of MGSU. The authors conducted an analysis of the requirements to experimental data when calculating turbulent characteristics of water flows. The article shows the necessity of checking the database of ripple continuity over time and the required representation of the number of points in the implementation. The results of experiments are presented showing the importance of fixing the length of the implementation and testing time. The authors offered a method of determining the optimal spatial coordinates for the measurement to minimize the time of filling the base of experimental data. According to the methods of defining optimal coordinate domain when measuring turbulent water flows with the use of “LAD-056” in a rectangular channel with glass walls in was established that it is required to conduct measurements within the range from 0 to 120 mm from the closest side wall. In case of greater deepening it is required to use illuminators reducing deflections of laser beams.

DOI: 10.22227/1997-0935.2016.2.106-115

References
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REFINEMENT OF METHODS OF CALCULATION OF HYDRAULIC RESISTANCE COEFFICIENT FOR SMOOTH OPEN CHANNELS

Vestnik MGSU 1/2017 Volume 12
  • Volgin Georgiy Valentinovich - Moscow State University of Civil Engineering (MGSU) Head of “Hydraulics and Hydromechanics” Scientific & Research Laboratory, Head of “Water Engineering” Research Education Center, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 94-98

One of the main tasks of an engineer in design of hydraulic structures is to perform an accurate calculation of losses in a moving flow of liquid, whether that be a head conduit or open channel. Modern technologies make it possible to obtain construction materials enabling to reduce resistance in motion of liquid. Thus, the shifting of motion mode from hydraulically rough into the sphere of hydraulically smooth resistance takes place. In this regard, there is a need for improvement of methods for hydraulic resistance coefficient calculation. The analysis of existing methods for calculating the hydraulic resistance coefficient was performed. Reasons for necessity of the search of modern methods for calculation of this parameter were grounded. The data array that meets the requirements of the task was received using the modern equipment. The analysis of experimental results illustrating the influence of Reynolds number and Froude number, and of ratio of the channel width to the flow depth on the hydraulic resistance coefficient was performed. The revised method of calculating the coefficient of hydraulic resistance of smooth open channels is proposed.

DOI: 10.22227/1997-0935.2017.1.94-98

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