Experimental and numerical investigation of three-wing water-diverting rotary gate

LIU Hongtao; XIANG Dandan; ZOU Yutao; WU Yingjun; LIU Handan

doi:10.13522/j.cnki.ggps.2024248

Abstract：[Objective]There has been a growing demand in modern irrigation systems for devices that integrate precise flow measurement with effective water control.Traditional sluice gates lack multifunctionality and adaptability to smart irrigation needs.This paper addresses this by designing a new sluice gate-water separation rotary gate,based on the hydraulic design principle of turbine volute.[Method]A detailed structural design and flow measurement principle of the rotary gate are presented.Numerical simulations were conducted to evaluate the hydraulic performance of the gate under ten rotational speed scenarios,with the flow rate ranging from 3.00 to 10.08 L/s.The accuracy of the model was validated through physical experiments,in which the flow field characteristics,including water depth,velocity distribution and head loss,were analyzed.[Result]The average relative error of the flow measurement formula derived from the physical model was 3.35％and the minimum error was 0.28％.Local head loss accounted for an average of 46.03％of the total upstream stable head,with a minimum value of 16.48％.Rotation of the gate significantly improved water aeration,with the maximum dissolved oxygen increasing by 108.30％and the average increasing by 100.54％.The simulation results agreed well with experimental data.The average error in water depth was 0.77％and the minimum was 0.07％.The average error in simulated flow rate was 4.39％and the minimum error was 0.09％.[Conclusion]The designed water-diverting rotary gate shows accurate flow measurement,effective water control,and enhanced oxygenation capacity.Its simple structure and multifunctionality make it a promising technology for improving irrigation water use efficiency and water quality in irrigation systems.