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空间水跃可使局部范围内水流紊动剧烈,提高水流稳定性和消能效率,消能效果较好。为探讨空间水跃的流态特性,基于RNGκ-ε紊流模型和流体体积函数(VOF)自由表面处理方法,建立了三维紊流数学模型,数值模拟了突扩比为0.833、0.667、0.500、0.333等4种空间水跃情况,讨论了不同突扩比下空间淹没水跃的流态及漩涡演变规律。结果表明,空间水跃下游流态存在左右摆动、主流轴线聚集等现象,当突扩比小于一定值后,在水跃发展过程中将产生游离的立轴漩涡。研究成果为空间水跃在水利工程中的应用提供了理论依据和参考。
Spatial water jump can make the local area turbulent flow turbulence, improve water flow stability and energy dissipation efficiency, energy dissipation effect is better. In order to investigate the fluid characteristics of space hydro-jets, a three-dimensional turbulent mathematical model was established based on the RNG κ-ε turbulence model and the VOF free surface treatment method. Numerical simulation results show that the spurt ratio is 0.833, 0.667 and 0.500, 0.333 and other four kinds of space hydrodynamic conditions, discuss the different subduction ratio under the submerged water jump in the flow and vortex evolution law. The results show that there is a phenomenon of left-right swirling flow and the aggregation of the main axis in the downstream flow regime. When the sudden expansion ratio is less than a certain value, a free vertical swirling vortex will occur during the development of water jerk. The research results provide a theoretical basis and references for the application of space hydro-leaping in water conservancy projects.