LES和k-ε湍流模型对斜向淹没射流的数值模拟研究

发布时间：2018-06-19 20:21

本文选题：淹没射流 + 湍流模型　；参考：《水力发电学报》2017年01期

【摘要】：采用k-ε和LES大涡模拟两种湍流模型对斜向射流入水垫塘的流场进行了三维数值模拟研究,得到了射流的流速、涡量、压力等水力特性,并与粒子成像测速仪(PIV)得到的结果进行对比。结果表明,射流入水垫塘后其流态为典型的三维流态,受射流上下游紊流涡的影响,射流轴线、速度及压力分布呈现时空随机性的特征。k-ε湍流模型因对涡的各向同性假设,其计算结果不能反映斜向淹没射流流场结构的随机性特征,而LES大涡模型则可获得斜向淹没射流流场的时空随机性流场结构,如射流轴线、流速矢量分布、涡量场和压力场,准确揭示斜向淹没射流入水垫塘的流场演变过程和消能的剪切、混掺机理,并与PIV测试结果吻合良好。
[Abstract]:Using k- 蔚 and les large eddy simulation models, the three-dimensional numerical simulation of the flow field of oblique jet into the water cushion pond is carried out. The hydraulic characteristics of the jet, such as velocity, vorticity and pressure, are obtained. The results are compared with those obtained by particle imaging velocimetry (PIV). The results show that the jet flow pattern is a typical three-dimensional flow pattern after entering the pool. The jet axis, velocity and pressure distribution show the characteristics of space-time randomness. K- 蔚 turbulence model assumes the isotropy of the vortex due to the influence of the upstream and downstream turbulent vortices of the jet, and the distribution of the jet axis, velocity and pressure shows the characteristics of randomness in time and space. The calculated results do not reflect the random characteristics of the flow field structure of oblique submerged jet, while the les large eddy model can obtain the spatio-temporal random flow field structure of the oblique submerged jet flow field, such as jet axis, velocity vector distribution, vorticity field and pressure field. The evolution process of flow field and the shear and mixing mechanism of energy dissipation of oblique submerged jet entering water cushion pond are accurately revealed, and the results are in good agreement with the PIV test results.
【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;四川大学水利水电学院;
【基金】：国家自然科学基金(51009102;51409181) 新世纪优秀人才支持计划(2011SCU-NCET-10-0589)
【分类号】：TV135.2

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