非均匀风速场的挑流泄洪雾化数值模拟的研究

发布时间：2018-05-05 06:43

本文选题：水电站 + 挑流泄洪雾化　；参考：《华北电力大学》2015年硕士论文

【摘要】：随着一大批高坝的不断建成,水电站泄洪雾化问题已经越来越受到了人们的重视。目前利用数值模拟方法对泄洪雾化进行预测已经成为一种可行的方法。为此,本文主要以大坝挑流泄洪雾化为研究对象,利用中尺度大气模式WRF和流体力学模拟软件Meteodyn WT对水电站挑流泄洪雾化大坝下游风速场进行数值模拟,研究了在下游非均匀风速场的影响下,风速对泄洪雾化现象的影响,最终利用挑流雾化喷溅模型来研究泄洪雾化范围和降雨强度。论文的主要内容及成果如下：1.提出了应用WRF-WT模拟坝下游非均匀风场的方法。应用中尺度大气模式和流体动力学相结合的方法,研究坝下游非均匀风场的特性,并利用该方法对漫湾水电站和李家峡水电站大坝下游风速场进行了数值模拟。2.提出了水滴随机喷溅的改进数学模型。首先对掺气水舌的碰撞特性进行了研究,重点探讨了两股水舌在空中碰撞特性。其次确定了挑流水舌的入水形状和喷溅流量,完善了水滴随机喷溅的数学模型。3.利用李家峡和漫湾水电站的原型观测数据,对漫湾水电站和李家峡水电站对水滴随机喷溅数学模型进行了验证计算,验证了水滴随机喷溅数学模型,证明了水滴随机喷溅数学模型在实际工程中的实用性和可靠性。
[Abstract]:With the continuous construction of a large number of high dams, the problem of flood discharge atomization of hydropower stations has been paid more and more attention. At present, numerical simulation method has become a feasible method to predict flood discharge atomization. Therefore, in this paper, the wind velocity field downstream of the dam spillway atomization dam is numerically simulated by using mesoscale atmospheric model WRF and hydrodynamic simulation software Meteodyn WT. The effect of wind speed on the atomization of flood discharge was studied under the influence of the inhomogeneous wind velocity field in the downstream. Finally, the spray model of jet atomization was used to study the atomization range of flood discharge and the intensity of rainfall. The main contents and results of the thesis are as follows: 1. A method for simulating the inhomogeneous wind field downstream of a dam with WRF-WT is presented. The characteristics of the inhomogeneous wind field in the lower reaches of the dam are studied by using the mesoscale atmospheric model and hydrodynamic method. The numerical simulation of the wind velocity field downstream of the dam of Manwan Hydropower Station and Lijiaxia Hydropower Station is carried out by using this method. An improved mathematical model for the random splash of water droplets is presented. Firstly, the collision characteristics of aerated water tongue are studied, and the collision characteristics of two jets of water tongue in the air are discussed. Secondly, the shape and flow rate of the splattering tongue are determined, and the mathematical model of random splash of water droplets is improved. Based on the prototype observation data of Lijiaxia and Manwan Hydropower stations, the mathematical models of random splash of water droplets in Manwan Hydropower Station and Lijiaxia Hydropower Station are verified and calculated. The practicability and reliability of the mathematical model of water droplet random splashing in practical engineering are proved.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV135.2

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