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采用Fluent双方程紊流模型研究有限深静水环境中的二维垂向紊动射流,基于Fluent的VOF方法跟踪自由表面、UDF技术(用户自定义函数)给出边界条件。采用该模型研究了不同射流速度与水深组合的自由射流及带升管射流等工况,分析了其模拟结果,并采用形状参数α对射流出口升管进行分类。结果表明,当α≥7.50时,射流场稳定,环境水体不能进入升管;当1.67≤α≤5.00时,射流场具有不稳定特征,环境水体将以回旋流方式进入升管;当α≤1.50时,升管对射流的流场影响较小。
The two-dimensional vertical turbulent jet in a limited deep-water environment was studied by Fluent two-equation turbulence model. The free surface was tracked by the Fluent-based VOF method. The boundary conditions were given by the UDF technique (user-defined function). The model was used to study the free jet with different jet velocity and water depth and the jets with riser jet. The simulation results were analyzed. The shape parameters α were used to classify the jet outlet riser. The results show that when α≥7.50, the jet field is stable and the environmental water body can not enter the riser pipe. When 1.67≤α≤5.00, the jet field has unstable characteristics, and the environmental water body will enter the riser by the swirl flow. Whenα≤1.50 , The riser has little effect on the flow field of the jet.