河道温排水掺混模拟与温脊线特征分析

The analysis of river thermal discharge mixing and temperature ridge characteristics

该文基于k-ε紊流方程,建立了三维温水排放紊流模型,并用物理模型试验资料对模型进行了验证。分析了排水温度、环境温度、环境流速和排水流速等影响因素对温水掺混规律的影响,提出温脊线概念,研究了影响因素与包络线宽度、排放口下游11 m断面处温脊线横向最大距离和温脊线平均坡度的定性响应关系。结果表明,其定性关系主要受到温度梯度、扩散通量以及温脊线路线等因素的影响。

Based on the k-ε turbulence equations, a 3D turbulence model for heated water discharge is built, the data of physical model test are used to verify this model. It is found out that how the discharge temperature, ambient temperature,environment velocity and discharge velocity can affect the mixing process of heated water discharge. Introducing the mixing envelope and warm ridge concept, the qualitative response relationship between the factors and the envelope width, as well as the maximum lateral distance of the warm ridge line 11 m downstream of the outfall and the average temperature gradient of the ridge line is studied. The results show that the qualitative relationship is mainly due to the effect of the temperature gradient, the diffusion flux and the path of temperature ridge, etc.