| As a new type of hydraulic automatic control gate,the main working principle of the hydraulic automatic control tilt gate is to realize the automatic opening and closing of the gate by means of the upstream water pressure and the gravity of the gate itself.The opening of the gate will be adjusted automatically with the rise and fall of the upstream water level.When the inflow increases and the water level increases,the opening of the gate will become larger,otherwise it will become smaller.It not only has the same function as the traditional gate,but also is more simple and reliable.At the same time,the gate will always be in the balance of water pressure and its own gravity in the process of opening and closing.But at present,there is little research on the hydraulic automatic tilting gate at home and abroad,and no relevant research results on the hydraulic automatic tilting gate have been found,and few mature experience can be used for reference.This paper collects relevant data through physical model experiment,and carries on the theoretical analysis to reach the preliminary study on the flow characteristics of hydraulic automatic control tilt gate.The first is to observe the flow pattern,measure the water surface line and the flow velocity in the downstream channel behind the sluice,and analyze the flow pattern characteristics when the water flows through the hydraulic automatic tilting gate;the second is to analyze the relationship between the head on the sluice and the flow rate;the third is to use the energy equation according to the basic principle of hydraulics,and the bottom sill is a wide-crested weir gate.In the process of deducing the discharge formula of outflow,the discharge formula of hydraulic automatic control inclined gate is deduced,and the discharge coefficient is calculated by the formula,and the influencing factors of the discharge coefficient are analyzed.Based on the above research,the main research results include:(1)Under the condition of free flow,the upstream flow pattern of hydraulic automatic tilting gate is stable and the flow velocity is uniform,but the downstream flow pattern is unstable and uneven,and the water surface line is basically in a single descending state.The downstream channel forms obvious "S" type water wave,the velocity distribution is uneven,and the inclination angle of hydraulic automatic tilting gate is uneven.The change of velocity has great influence on the flow velocity of the left and right sides of the downstream river.(2)The tilt angle of the hydraulic automatic tilt gate has an effect on the flow capacity of the gate.The bigger the tilt angle is,the bigger the flow capacity of the hydraulic automatic tilt gate is.(3)Analysis of Flow through Sluice,The formula shows that the main factor affecting the discharge coefficient of the hydraulic automatic tilt gate is the tilt angle of the hydraulic automatic tilt gate.(4)The formula for calculating the flow coefficient of hydraulic self controlled slant gate is ? = 0.60-0.176e/H.The influence of inclination angle of hydraulic automatic tilting gate on discharge coefficient is studied and analyzed.The results show that the inclination angle of hydraulic automatic tilting gate has a great influence on discharge coefficient when the flow rate is small.When the flow rate reaches or exceeds 150 m3/h,the inclination angle of hydraulic automatic tilting gate has a little influence on discharge coefficient.Based on the study of hydraulic automatic control tilting gate,the law and characteristics of flow pattern,velocity,water level and pressure are studied and summarized.The discharge formula and calculation method of discharge coefficient of hydraulic automatic control tilting gate are obtained by using energy equation,thus making up for the blank of relevant research and providing data for further research and popularization in the future.Support. |
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