畅流活水净化动力学行为分析

针对河道和湖泊水质净化处理问题,从水动力学方面优化水体自身的水质净化能力,基于FLUENT软件分别建立二维和三维水动力模型,模拟注水过程中流场的变化,以流场中流速、压力以及湍流强度为指标,研究不同注水位置对水质自净化过程的影响。结果表明:在深度方向上,随着进水口位置的下移,流场活跃范围减小,死区增多；在流动方向,流动距离越远,流场湍流强度越大；在宽度方向,流场流速,压力和湍流强度均以中间进水口的纵向截面对称,流速主要集中在进水口主流区,以及末端的回流处。进水口越接近上部,对于水体的自净化促进效果越好,建议采用上部注水方式来促进河道自净化。研究结果可对促进河道水质自净化提供参考和建议。

Analysis of Dynamic Behavior of Water Purification through Flowing Water

In response to the problem of water quality purification in rivers and lakes, the water quality purification ability of the water body itself is optimized from the perspective of hydrodynamics. Based on FLUENT software, two-dimensional and three-dimensional hydrodynamic models are established to simulate the changes in the flow field during the water injection process. The impact of different water injection positions on the water quality self purification process is studied using flow velocity, pressure, and turbulence intensity as indicators. The results show that in the depth direction, as the inlet position moves downwards, the active range of the flow field decreases and the dead zone increases; In the flow direction, the farther the flow distance, the greater the turbulence intensity in the flow field; In the width direction, the flow velocity, pressure, and turbulence intensity of the flow field are symmetrical with the longitudinal section of the middle inlet, and the flow velocity is mainly concentrated in the main flow area of the inlet and the reflux at the end. The closer the water inlet is to the upper part, the better the promotion effect of water self purification. It is recommended to use the upper water injection method to promote river self purification. The research results can provide reference and suggestions for promoting the self purification of river water quality.