基于WRF模式和SPH的泄洪雾化数值模拟研究
发布时间：2019-02-22 10:03
【摘要】：随着我国高水头、大流量水电站的建成,以及新式消能工的推广应用,泄洪雾化问题日益凸显。目前对泄洪雾化的范围和强度进行预测的方法有:原型观测、理论计算、数值计算等。由于中小尺度数值气象模式WRF(Weather Research and Forecasting),可模拟分辨率达1km的局地气象场,SPH(Smoothed Particle Hydrodynamics)方法可以模拟泄洪雾化中水滴的运动和碰并作用,使得结合WRF模式和SPH方法对泄洪雾化进行预测成为一种可行的方法。本文以挑流泄洪雾化为研究对象,研究了局地气象场和水滴碰并对泄洪雾化现象的影响,使用SPH水滴碰并模型来预测泄洪雾化的范围和降雨强度。论文的主要内容及成果如下:1.WRF模式在河谷地形下边界层方案的敏感性分析。应用WRF模式,对河谷地形下WRF的多种边界层方案进行对比分析。并使用模拟精度相对较高的边界层方案,即MYNN2边界层方案,对二滩水电站风速场进行了数值模拟。2.使用SPH方法构建水滴碰并模型。首先对掺气水舌和雾化源的特性进行研究,其次基于随机喷溅模型,建立了SPH水滴碰并的数学模型,模型中考虑了水滴受到重力、水舌风、自然风等作用力和水滴相互之间的碰并作用。3.使用SPH水滴碰并模型对二滩水电站的挑流泄洪雾化进行预测,并利用二滩水电站的原型观测数据进行验证计算,验证了使用SPH方法构建的水滴碰并数学模型在实际工程中的准确性。
[Abstract]:With the construction of high water head, large flow hydropower stations and the popularization and application of new energy dissipators, the problem of flood discharge atomization has become increasingly prominent. At present, the methods of predicting the scope and intensity of flood discharge atomization include prototype observation, theoretical calculation, numerical calculation and so on. Because the mesoscale numerical meteorological model (WRF (Weather Research and Forecasting),) can simulate the local meteorological field (, SPH (Smoothed Particle Hydrodynamics) method with a resolution up to 1km, it can simulate the motion and collision of water droplets in flood discharge atomization. It is a feasible method to predict flood discharge atomization with WRF model and SPH method. In this paper, the influence of local meteorological field and water droplet impact on the atomization of flood discharge is studied. The SPH model is used to predict the range of atomization and the intensity of rainfall. The main contents and results are as follows: sensitivity analysis of 1.WRF model in boundary layer scheme under valley topography. By using WRF model, several boundary layer schemes of WRF under valley topography are compared and analyzed. The wind velocity field of Ertan Hydropower Station is numerically simulated by using the MYNN2 boundary layer scheme, which has relatively high simulation accuracy. 2. The water drop collision model was constructed by using SPH method. Firstly, the characteristics of aerated water tongue and atomization source are studied. Secondly, based on the random splash model, the mathematical model of SPH water droplet collision is established, in which the gravity of the water droplet and the water tongue wind are considered in the model. Natural wind and other forces and the impact of water droplets on each other. 3. The SPH droplet collision model is used to predict the spillway of Ertan Hydropower Station, and the prototype observation data of Ertan Hydropower Station are used to verify the calculation. The accuracy of the water drop collision mathematical model constructed by SPH method is verified in practical engineering.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV135.2
本文编号：2428109
[Abstract]:With the construction of high water head, large flow hydropower stations and the popularization and application of new energy dissipators, the problem of flood discharge atomization has become increasingly prominent. At present, the methods of predicting the scope and intensity of flood discharge atomization include prototype observation, theoretical calculation, numerical calculation and so on. Because the mesoscale numerical meteorological model (WRF (Weather Research and Forecasting),) can simulate the local meteorological field (, SPH (Smoothed Particle Hydrodynamics) method with a resolution up to 1km, it can simulate the motion and collision of water droplets in flood discharge atomization. It is a feasible method to predict flood discharge atomization with WRF model and SPH method. In this paper, the influence of local meteorological field and water droplet impact on the atomization of flood discharge is studied. The SPH model is used to predict the range of atomization and the intensity of rainfall. The main contents and results are as follows: sensitivity analysis of 1.WRF model in boundary layer scheme under valley topography. By using WRF model, several boundary layer schemes of WRF under valley topography are compared and analyzed. The wind velocity field of Ertan Hydropower Station is numerically simulated by using the MYNN2 boundary layer scheme, which has relatively high simulation accuracy. 2. The water drop collision model was constructed by using SPH method. Firstly, the characteristics of aerated water tongue and atomization source are studied. Secondly, based on the random splash model, the mathematical model of SPH water droplet collision is established, in which the gravity of the water droplet and the water tongue wind are considered in the model. Natural wind and other forces and the impact of water droplets on each other. 3. The SPH droplet collision model is used to predict the spillway of Ertan Hydropower Station, and the prototype observation data of Ertan Hydropower Station are used to verify the calculation. The accuracy of the water drop collision mathematical model constructed by SPH method is verified in practical engineering.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV135.2
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