温排水变态模型的水平扩散相似问题

发布时间：2018-01-01 12:18

本文关键词：温排水变态模型的水平扩散相似问题　出处：《水利学报》2016年11期 　论文类型：期刊论文

【摘要】：温排水变态模型扩散系数与模型变率之间存在着密切联系,了解、明确温排水变态模型的扩散相似影响,对温排水试验模型设计、几何变态率选择以及提高模型模拟精度具有重要意义。本文总结分析了前人关于污染物水平扩散系数计算方法以及扩散相似问题等相关研究成果,据此提出了宽浅型水域污染物水平扩散系数通用计算模式。在此基础上,基于可控温、湿度条件下温排水输移扩散水槽试验与数学模型反演计算分析相结合的方法,开展了散热相似条件下不同变态率模型温排水输移扩散影响对比研究,对不同变率条件下流场、温度场主要特征参数及水平扩散项参数取值进行了深入的分析,提出了宽浅型水域变态模型水平扩散系数与模型变率间的计算关系式。经原型实测资料验证,该关系式在宽浅水域具有良好的适宜性,可用于温排水及其它污染物输移扩散变态模型与原型间水平扩散系数的转换计算。研究结果为今后宽浅型水域中温排水或其他污染物输移扩散数模计算、物理模型试验参数选择奠定了良好的基础。
[Abstract]:There is a close relationship between the diffusion coefficient and the model variability of the thermal drainage metamorphosis model. It is understood that the diffusion similarity effect of the temperature drainage metamorphosis model is clear, and the design of the temperature drainage test model is made clear. It is of great significance to select geometric distortion rate and improve the accuracy of model simulation. This paper summarizes and analyzes the previous research results on the calculation method of horizontal diffusion coefficient of pollutants and diffusion similarity. Based on this, a general calculation model of horizontal diffusion coefficient of pollutants in wide and shallow water area is proposed, and based on this model, the temperature can be controlled. A comparative study on the influence of temperature drainage transfer and diffusion under the condition of similar heat dissipation rate was carried out by combining the experiments of temperature drainage transfer and diffusion flume with mathematical model inversion calculation and analysis under the condition of humidity. The main characteristic parameters and horizontal diffusion parameters of the flow field and the temperature field under different variable rates are analyzed in depth. The relationship between horizontal diffusion coefficient and model variability of wide and shallow water metamorphosis model is proposed. The experimental data of prototype show that the relationship is suitable for wide shallow water area. It can be used to calculate the horizontal diffusion coefficient between the model of temperature drainage and other pollutant transport and diffusion metamorphosis and the model of horizontal diffusion coefficient between the prototype. The result is the numerical model calculation of temperature drainage or other pollutant transport and diffusion in wide shallow water in the future. The selection of physical model test parameters has laid a good foundation.
【作者单位】：中国水利水电科学研究院;
【基金】：国家自然科学基金项目(51209228) CAP1400安全审评关键技术研究国家科技重大专项(2013ZX06002001)
【分类号】：X52;X143
【正文快照】： 1研究背景物理模型试验是温排水输移扩散影响研究的重要手段之一,其主要优点是可以更加直观、准确地反映排放口近区温排水掺混、稀释特性。然而,对于需反映取排水工程水域温排水整体输运规律的试验模型,囿于试验室场地与模拟范围间所存在的矛盾,一般需采用水平比尺与水深比尺

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