Study on Layout Pattern of Filling and Emptying System in Datengxia Shiplock
Abstract
Datengxia Shiplock is the super-high head single-lift shiplock with the largest chamber in the world. The single filling and emptying capacity of Datengxia Shiplock is much larger than that of Three Gorges Shiplock. Due to huge kinetic energy of flow during filling and emptying, there are significant problems in term of berthing conditions in the chamber and flow cavitation at valve section. Measured in the model with layout of filling and emptying system and valve operation mode similar to those of Three Gorges Shiplock, the mooring force in the chamber is higher than double of the permissible value specified. Given this, it is necessary to seek for a new layout of filling and emptying system suitable for Datengxia Shiplock. The layout finalized based on engineering analogy, mathematical model and physical model in reference to successful layouts of filling and emptying system at domestic and overseas existing high head shiplocks inherits the high adaptability of the 4-section inertia-equilibrium filling and emptying system to unsteady flow, and significantly enlarges the area with outflow hole, to 90% of the chamber area with the simple autonomic diversion structure of the 2nd diversion port. This effectively reduces horizontal and longitudinal flows in the chamber and lowers the specific energy of energy-dissipating water body. On the basis, a layout pattern of filling and emptying with even outflow throughout the chamber is constituted. Given the mooring force measured in the model is much lower than the permissible value specified, such structure is referable for subsequent super-high head shiplocks with large chamber.
Study on Layout Pattern of Filling and Emptying System in Datengxia Shiplock
Portland, OR
Datengxia Shiplock is the super-high head single-lift shiplock with the largest chamber in the world. The single filling and emptying capacity of Datengxia Shiplock is much larger than that of Three Gorges Shiplock. Due to huge kinetic energy of flow during filling and emptying, there are significant problems in term of berthing conditions in the chamber and flow cavitation at valve section. Measured in the model with layout of filling and emptying system and valve operation mode similar to those of Three Gorges Shiplock, the mooring force in the chamber is higher than double of the permissible value specified. Given this, it is necessary to seek for a new layout of filling and emptying system suitable for Datengxia Shiplock. The layout finalized based on engineering analogy, mathematical model and physical model in reference to successful layouts of filling and emptying system at domestic and overseas existing high head shiplocks inherits the high adaptability of the 4-section inertia-equilibrium filling and emptying system to unsteady flow, and significantly enlarges the area with outflow hole, to 90% of the chamber area with the simple autonomic diversion structure of the 2nd diversion port. This effectively reduces horizontal and longitudinal flows in the chamber and lowers the specific energy of energy-dissipating water body. On the basis, a layout pattern of filling and emptying with even outflow throughout the chamber is constituted. Given the mooring force measured in the model is much lower than the permissible value specified, such structure is referable for subsequent super-high head shiplocks with large chamber.