内湿外干型折板式竖井泄流特性数值模拟

内湿外干型折板式竖井较传统折板式竖井具有明显优势。为分析内湿外干型折板式竖井的泄流特性,以某实际深层隧道调蓄系统竖井为背景,采用CFD商用软件,采用RNGκ-ε双方程紊流模型和Tru-VOF方法,数值模拟内湿外干型折板式竖井内的下泄水流,得到往复跌流、临界流、S型贴壁流三种流态。模拟结果表明,内湿外干型折板式竖井在不同泄流量下的综合消能率均大于90%,处于较高水平,竖井消能率在形成S型贴壁流态后下降较快,数值模拟结果与物理试验实测值吻合良好,CFD软件可对该类问题进行数值模拟。

Numerical Simulation of Discharge Characteristics of Inside Wet Outside Dry Baffle-Drop Shaft

Inside wet outside dry baffle-drop shaft has obvious advantages over the traditional baffle-drop shaft.In order to analyze the discharge characteristics of inside wet outside dry baffle-drop shaft,taking apractical deep tunnel drainage system project as the background,the RNGκ-εdouble-equation turbulence model and the Tru-VOF method in CFD commercial software were adopted to simulate discharge of inside wet outside dry baffle-drop shaft.And then three patterns of reciprocating drop flow,critical flow and S-shaped attaching wall were obtained.The results show that the comprehensive energy dissipation ratio of different discharges is higher than 90%,at a higher level,and the shaft energy dissipation ratio decreases rapidly after the S-shaped attaching wall flow pattern is formed.The numerical simulation results are in good agreement with the measured values of physical experiments.Thus,the CFD software can be used to simulate the flow of this kind of problem.