单层多股和多层多股水平淹没射流的消能特性分析

Analysis on energy dissipation of the single-lever with multi-strand and multi-lever with multi-strand horizontal submerged jets

本文采用FLUENT软件对单层多股和多层多股水平淹没射流两种消能方式进行了三维数值模拟,根据模拟结果对比分析了两种消能方式的流速分布、压力分布和紊动能分布特性。研究表明,多股多层水平淹没射流这种新型消能方式的水股进入消力池水体的中部,利用在射流轴线周围所形成的强剪切、不同方向漩滚的剧烈混掺来达到消能的目的。具有消能率高、临底流速低、消力池底板稳定性好等特点,在高水头大流量的水利工程中具有很大的应用前景。

3-D numerical simulation was done to two types of the horizontal submerged jets： single-lever with multistrand, multi-lever with multi-strand by means of FLUENT software. Velocity profile, time-averaged pressure and turbulence energy of two forms of energy dissipation were contrasted. The results show that the eddies surrounding the main stream exist in multi-lever and multi-strand horizontal submerged jets, which form several strong shear flows then enhance the effect of energy dissipation. It is a new energy dissipation type with more dissipated energy rate, and has broad application value.