楼庄子水库溢洪洞出口消能型式数值模拟分析

Numerical simulation analysis of spillway tunnel outlet energy dissipater for Louzhuangzi Reservoir

采用数值模拟方法,对楼庄子水库溢洪洞出口底流消能与挑流效能两种初拟方案进行分析研究,运用标准k-ε计算模型结合流体体积分数法(VOF)追踪自由水面,对溢洪洞不同方案进行了三维水气两相流数值模拟。通过同等计算条件下,设计工况计算成果分析,对比了两种方案的流速矢量图及水气两相流云图,结果:底流消能效果较好;两方案中,底流消能池深、挑流消能挑角均应进一步优化。

For the spillway tunnel outlet of Louzhuangzi Reservoir, numerical simulation was conducted to analyze two energy dissipater proposals of underflow dissipation and ski-jump dissipation. Standard k-ε model combining with fluid volume fraction method （VOF） was adopted to trace the free water surface. 3D water gas two-phase flow numerical simulation was also carried out for various spillway tunnel schemes. The calculation results of design condition conducted under the same calculating condition were analyzed. The flow velocity vector and water gas two- phase flow chart of two schemes were compared, which demonstrated the underflow scheme is better; the underflow stilling basin depth and the deflecting angle both required further optimization.