| 蔡渝春,纪平,陈小莉.温排水变态模型的水平扩散相似问题[J].水利学报,2016,47(11):1456-1464 |
| 温排水变态模型的水平扩散相似问题 |
| Similarity of horizontal mixing of thermal effluent distorted model |
| 投稿时间：2016-01-28 |
| DOI：10.13243/j.cnki.slxb.20160117 |
| 中文关键词: 扩散相似 水平扩散系数 模型变态率 |
| 英文关键词: similarity of mixing horizontal mixing coefficients distortion ration |
| 基金项目: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） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Close relations exist between the mixing coefficient of thermal effluent and the distortion ration. Understanding and clearing the impact of similarity of mixing is important to design the thermal effluent model,to choose the distortion ration and to improve the accuracy of model simulation. Previous computation-al methods of mixing coefficients and previous studies about the problem of similarity theory study of mix-ing are summarized, and the common computational model of the horizontal mixing coefficients in the wide-shallow waters is proposed. On the base of these,mathematic model calculation is combined with ther-mal discharge flume experiment under the condition of controlled temperature and humidity. And contrastive study on transport and mixing of thermal effluent distorted model under similar conditions of surface heat dissipation is carried out. The main characteristic parameters of flow field and temperature field and horizon-tal mixing coefficients under different scale rates are analyzed. Finally, the logarithmic formula used in the wide-shallow waters between horizontal mixing coefficient and the distortion ration is proposed. Verified by the field measured data, the formula has acceptable feasibility. It can be used for the conversion calcula-tion of horizontal mixing coefficients between the distorted model and the prototype. The research findings lay a good foundation for numerical simulation and the selection of physical model test parameters of ther-mal effluent or other pollutants in the wide-shallow waters. |
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