Performance of Geometry of Gate Lip Angle—A Case Study

Gate lip angle is defined as the angle which is given by the ratio of vertical distance as measured between the skin plate bottom edge and the bottom edge of gate, to thickness of gate as measured from the upstream face of gate bottom edge to the upstream edge of skin plate bottom edge. Gate lip angle has a profound influence on gate vibrations, cavitations and down pull of the gate. Hence lip angle of the gate plays an important role in the design of gate structure. It is unfortunate that in spite of many hydraulic model studies over the years by eminent researchers on a variety of practical and impractical gate bottom lips, no guidance is available to the practical gate designer to determine gate lip geometry. So the model study on gate lip has its own importance so far the gate design is concerned. This paper provides case studies guidelines to know the performance of lip angles from the model study. The results of model studies on geometry of lip angle are presented in this paper. The information from the model studies might be useful to the designers and could be taken as reference for similar type of geometry of lip angle study in future.