高水头船闸双层输水系统数值计算

Numerical calculation on double layer filling-emptying system of high-head ship lock

高水头船闸由于水头高、输水时间短等因素常存在流速大、结构空化以及闸室出流不均匀等问题,对过闸船舶及船闸结构的安全产生不利影响。结合三峡船闸实际运行情况,提出一种新型双层等惯性输水系统,将部分廊道和分流口布置高程降低,形成底层输水廊道,增大闸底板出水孔布置区域,在输水量增加、输水时间不变的条件下,能够保证输水系统结构的安全以及闸室水流条件的均匀性。采用RNG k-ε湍流模型进行中间级船闸的充泄水过程模拟计算,分析输水过程流量、闸室水位变化情况、输水系统流速及压强分布等水力特性,验证了双层等惯性输水系统的可行性。研究成果可为高水头船闸输水系统设计提供技术参考。

There are some problems such as high flow velocity,structural cavitation and uneven discharge of lock chamber,because of the high-head and short delivery time,which have adverse effects on the safety of ships passing through the shiplock and the structure of the shiplock.The papper combines with the actual operation of the Three Gorges Shiplock,a new type of double-layer inertia-equilibrium filling-emptying system is proposed,which reduces the elevation of some galleries and diversion openings,forms the bottom filling-emptying gallery,and increases the layout area of shiplock floor outlet.Under the condition of increasing water delivery volume and maintaining water delivery time,it is possible to ensure the safety of the filling-emptying system structure and the uniformity of water flow conditions in the lock chamber.The RNG k-εturbulence model is used to simulate the filling and discharging process of intermediate shiplock.The hydraulic characteristics such as flow rate,water level change of lock chamber,velocity and pressure distribution of filling-emptying system are analyzed.The research results prove the feasibility of double-layer inertia-equilibrium filling-emptying system which can provide technical reference for the design of filling-emptying system of high-head and abyssolith shiplock.