保水堰局部体型优化的数值模拟

保水堰作为南水北调中线工程天津干线的新型衔接性建筑物，其水力特性关系到整个输水工程的成败，但就原体型来看，保水堰在不同水位运行时呈现出的三种流态都存在不良流态。本文通过数值模拟的方法对保水堰局部体型进行了初步优化，使其体型更加符合水流运行条件，使保水堰的流态、管道流速分布都达到了一个比较协调的状态，并且增大了局部水头损失，对消能更有利。数值模拟的计算结果与模型试验基本吻合，体型优化结果可为实际工程的设计和运行提供参考。

Numerical Simulation of the Local Body Type Optimization of Water Conservation Weir

Water conservation weir is a new-style linking hydraulic structure in the Tianjin section of the middle route of the South to North Water Transfer Project in China. Its hydraulic characteristics are connected to the success of transferring project. As for the original type, three kinds of flow pattern existing in the water conservation weir with the variation of water level are not good occasionally. In the paper, the local body type of water conservation weir is optimized by the way of numerical simulation. Through the optimization, the body type accords with the flow pattern preferably, and the local head loss coefficient increases, which is good for energy dissipation. The simulation results are in good agreement with the model test.