Document Type : Research Paper
Authors
1
PhD candidate, Irrigation and Reclamation Engineering Dept. Faculty of Agriculture, University college of Agriculture and natural resources, University of Tehran, Karaj, Iran.
2
Prof. Irrigation and Reclamation Engineering Dept., Faculty of Agriculture, University college of Agriculture and Natural resources, University of Tehran, Karaj, Iran.
3
Department of Water Science and Engineering, Faculty of Agriculture and Natural Resources, Imam Khomeini International University, Qazvin, Iran
Abstract
Automatic flow control valves are one of the most important parts of the conveyance, distribution, and volumetric water delivery. Automatic flow control valves are usually designed for common heads in pressurized distribution networks. In this study, a new structure has been designed for farm use to control the flow which is applied in low operation heads. A numerical simulation by Ansys Fluent was carried out after a performance examination in the laboratory. This numerical modeling will lay the groundwork for the low-cost development of the automatic flow control valve for operating in a wide range of heads and flow rates. Due to the mobility of the internal components of this control valve, its dynamic simulations are complex and require the use of a dynamic mesh, which is very time-consuming to implement. In this research, to reduce the time of dynamic simulation, conventional assumption is considered to simplify the flow field geometry and its results are reported based on the results. The results show that excluding a guide rod from geometry, whilst facilitate dynamic simulation and decrease simulation time, also leads to a one-sided systematic error ranging from 2.7 to 4.9 percent. Since the direction of the discharge estimation error is one-sided, the correlation relationship of the results was presented and reported in this study.
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