含沙水流深层排放入海的浮力射流模拟
发布时间：2018-11-22 20:06
【摘要】：为准确评价污水深层排海对环境水域的影响,开展深水排海的数值模拟预测研究具有重要意义。建立考虑泥沙和盐度差引起的浮力射流影响的3维泥沙和盐度输移扩散的RNGκ-ε紊流模型,通过室内机理试验对模拟流场和盐度场进行了验证,模拟结果和试验结果符合较好;利用该模型对低盐度含沙水流排入某海域后的水力特性以及盐度和含沙量扩散对环境水体的影响进行模拟预测。结果表明:含沙的淡水水流排入海水后由于密度差而呈现出上升的浮力射流的特征,射流轴线在垂向上呈抛物线形态;浮力射流到达水面后,以该点为中心,呈蝴蝶型形状向四周扩散,污染带平面范围逐渐增大,影响范围内盐度持续减小,含沙量持续增加;污染带在开始时段扩散速度较快,随着掺入水体的影响范围加大,污染带边界向四周推移的速度逐渐放缓。
[Abstract]:In order to accurately evaluate the influence of deep sewerage on environmental waters, it is of great significance to study the numerical simulation and prediction of deep-water drainage. The RNG 魏-蔚 turbulence model considering the effect of buoyancy jet caused by sediment and salinity difference is established. The simulated flow field and salinity field are verified by laboratory mechanism tests. The simulation results are in good agreement with the experimental results. The model is used to simulate the hydraulic characteristics of low salinity sediment flow and the influence of salinity and sediment content diffusion on the environmental water body. The results show that the flow of fresh water containing sand has the characteristics of rising buoyant jet due to the difference of density, and the axis of the jet is parabola in vertical direction. When the buoyant jet reaches the surface of the water, it spreads around in the shape of butterfly, and the plane range of the pollution zone increases gradually, the salinity decreases and the sediment content increases. The diffusion rate of the pollution zone is faster at the beginning, and the speed of the boundary of the pollution zone gradually slows down with the increase of the influence range of the adulterated water body.
【作者单位】： 四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金面上资助项目(851279114;851279115);国家自然科学基金青年基金资助项目(851409182) 国家重点研发计划资助项目(2016YFC0401700)
【分类号】：O358
，
本文编号：2350421
[Abstract]:In order to accurately evaluate the influence of deep sewerage on environmental waters, it is of great significance to study the numerical simulation and prediction of deep-water drainage. The RNG 魏-蔚 turbulence model considering the effect of buoyancy jet caused by sediment and salinity difference is established. The simulated flow field and salinity field are verified by laboratory mechanism tests. The simulation results are in good agreement with the experimental results. The model is used to simulate the hydraulic characteristics of low salinity sediment flow and the influence of salinity and sediment content diffusion on the environmental water body. The results show that the flow of fresh water containing sand has the characteristics of rising buoyant jet due to the difference of density, and the axis of the jet is parabola in vertical direction. When the buoyant jet reaches the surface of the water, it spreads around in the shape of butterfly, and the plane range of the pollution zone increases gradually, the salinity decreases and the sediment content increases. The diffusion rate of the pollution zone is faster at the beginning, and the speed of the boundary of the pollution zone gradually slows down with the increase of the influence range of the adulterated water body.
【作者单位】： 四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金面上资助项目(851279114;851279115);国家自然科学基金青年基金资助项目(851409182) 国家重点研发计划资助项目(2016YFC0401700)
【分类号】：O358
，
本文编号：2350421
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