AI Summary & Key Takeaways
AI InsightThe results indicate that the maximum value of the contraction coefficient corresponds to the smallest gate opening.
📌 3 Key Takeaways
Abstract
One of the most commonly used control structures is the sluice gate, which is typically employed as a vertical plate installed within the flow path of open channels. The present study aims to investigate the effect of the gate opening ratio on the hydraulic characteristics of the flow. The results indicate that the maximum value of the contraction coefficient corresponds to the smallest gate opening. Furthermore, for all opening conditions, the contraction coefficient decreases with increasing upstream water depth. The findings also reveal an inverse relationship between the gate opening and the discharge coefficient, such that a reduction in gate opening leads to an increase in the discharge coefficient. On average, the discharge coefficient for a gate opening of 1 cm is approximately 7.75%, 16.51%, and 18.35% higher than those corresponding to openings of 2, 4, and 5 cm, respectively. Analysis of the results further shows that, for a constant discharge, increasing the gate opening results in reduced energy dissipation between the upstream and downstream sections of the hydraulic jump. Moreover, as the Froude number downstream of the gate identified as the most influential dimensionless parameter governing energy dissipation increases, the relative energy loss also increases. In this study, the Froude number ranges from 2.2 to 14.2, exerting a direct influence on the length of the hydraulic jump, which decreases with increasing gate opening. Additionally, the gate opening exhibits an inverse relationship with both the upstream water depth and the magnitude of the hydrodynamic force acting on the gate. Based on dimensionless parameters, nonlinear polynomial regression relationships were developed using experimental data to predict the relative energy loss and the discharge coefficient of the sluice gate. These relationships demonstrate satisfactory performance according to statistical evaluation indices and can be applied with a high degree of confidence.
Özet
One of the most commonly used control structures is the sluice gate, which is typically employed as a vertical plate installed within the flow path of open channels. The present study aims to investigate the effect of the gate opening ratio on the hydraulic characteristics of the flow. The results indicate that the maximum value of the contraction coefficient corresponds to the smallest gate opening. Furthermore, for all opening conditions, the contraction coefficient decreases with increasing upstream water depth. The findings also reveal an inverse relationship between the gate opening and the discharge coefficient, such that a reduction in gate opening leads to an increase in the discharge coefficient. On average, the discharge coefficient for a gate opening of 1 cm is approximately 7.75%, 16.51%, and 18.35% higher than those corresponding to openings of 2, 4, and 5 cm, respectively. Analysis of the results further shows that, for a constant discharge, increasing the gate opening results in reduced energy dissipation between the upstream and downstream sections of the hydraulic jump. Moreover, as the Froude number downstream of the gate identified as the most influential dimensionless parameter governing energy dissipation increases, the relative energy loss also increases. In this study, the Froude number ranges from 2.2 to 14.2, exerting a direct influence on the length of the hydraulic jump, which decreases with increasing gate opening. Additionally, the gate opening exhibits an inverse relationship with both the upstream water depth and the magnitude of the hydrodynamic force acting on the gate. Based on dimensionless parameters, nonlinear polynomial regression relationships were developed using experimental data to predict the relative energy loss and the discharge coefficient of the sluice gate. These relationships demonstrate satisfactory performance according to statistical evaluation indices and can be applied with a high degree of confidence.