阶梯溢流坝滑行水流掺气过程的大涡模拟
发布时间：2018-12-06 12:56
【摘要】：阶梯滑行水流具有较强的紊动特征和复杂的水—气自由面,其数值模拟研究具有较高的难度。文中采用数值模拟方法对阶梯溢流坝的溢流过程与滑行水流的掺气过程进行研究,并探讨其掺气机理。采用体积分数(VOF)多相流模型和大涡模拟(LES)方法,对坡度为2.5∶-1的阶梯溢流坝模型进行计算。结果表明,计算结果与实验结果较为吻合,数值模型可靠,且能够生动地模拟阶梯溢流过程和掺气过程。进一步分析得出结论:足够大的湍动能和涡结构发展是自由面变形继而发生自掺气的内部原因。
[Abstract]:Because of the strong turbulent characteristics and the complicated free surface of water and gas, the numerical simulation of step glide flow is difficult. In this paper, numerical simulation method is used to study the overflow process of stepped spillway dam and the aeration process of sliding flow, and the aeration mechanism is discussed. By using the volume fraction (VOF) multiphase flow model and the large eddy simulation (LES) method, the stepped overflow dam model with a slope of 2.5: -1 is calculated. The results show that the calculated results are in good agreement with the experimental results and the numerical model is reliable and can vividly simulate the stepped overflow process and the aeration process. It is concluded that sufficient turbulent kinetic energy and the development of vortex structure are the internal causes of free surface deformation and self-aeration.
【作者单位】： 中山大学工学院;
【基金】：广东省协同创新与平台环境建设专项项目(2014B090904066) 广东省公益研究与能力建设专项项目(2015A020216008,2016A010104006)
【分类号】：TV135.2
本文编号：2366058
[Abstract]:Because of the strong turbulent characteristics and the complicated free surface of water and gas, the numerical simulation of step glide flow is difficult. In this paper, numerical simulation method is used to study the overflow process of stepped spillway dam and the aeration process of sliding flow, and the aeration mechanism is discussed. By using the volume fraction (VOF) multiphase flow model and the large eddy simulation (LES) method, the stepped overflow dam model with a slope of 2.5: -1 is calculated. The results show that the calculated results are in good agreement with the experimental results and the numerical model is reliable and can vividly simulate the stepped overflow process and the aeration process. It is concluded that sufficient turbulent kinetic energy and the development of vortex structure are the internal causes of free surface deformation and self-aeration.
【作者单位】： 中山大学工学院;
【基金】：广东省协同创新与平台环境建设专项项目(2014B090904066) 广东省公益研究与能力建设专项项目(2015A020216008,2016A010104006)
【分类号】：TV135.2
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