Abstract: The turbulent flow over the hydraulic plane gate slot was studied using large eddy simulation method. The effects of geometric parameters including width-to-depth ratio, stagger ratio, slope ratio and fillet ratio on hydraulic characteristics within and near the gate slot were simulated systematically. According to the vulnerable cavitation locations of the flow over the slot, the pressure distributions in swirl area and the separation zone at the rear of downstream corner of the slot were investigated emphatically. The results show that the effects of width-to-depth ratios and stagger ratios on the pressure distribution of the flow are significantly. The change of the width-to-depth ratio will affect the conversion of extremely low pressure area of the flow. The appropriate stagger ratio can eliminate the negative pressure of the separation zone. The settings of slopes and fillets can improve flow state and the pressure distributions to a certain extent.

Key words: gate slot, large eddy simulation, geometric parameters, negative pressure