滨海核电厂明渠深水温排放三维数值模拟研究

3D numerical simulation of waste thermal discharge by channel intodeap coastal area from nuclear power plants

核电厂温排水对海域环境的影响不容忽视,数学模型是预报温排水扩散范围的重要手段。三维数学模型能反映水温垂向分层,相比二维模型更为精细,由于其对垂向流速求解存在简化,应用于不同排放型式的模拟精度尚需要深入论证。本文针对深水明渠排放型式开展了温排水三维数值模拟,计算结果与物理模型及近区浮射流模型Cormix进行了对比,结果表明三维数学模型计算的1℃温升范围与物理模型接近,4℃温升范围较物理模型和Cormix显著偏小。本项研究表明现有三维数学模型单独应用于明渠水深排放型式难以同时兼顾近远区模拟精度,需要进一步开展与近区浮射流模型的耦合研究以提升其适用性。

The waste thermal discharge from nuclear power plants(NPP) brings heavy influence that cannot be ignored.Numerical model is a main approach for the thermal dispersion range forecast.The 3D model, with the ability to describe the thermal stratification, shows a clear advantage over the 2D model.Due to simplification in the solution of vertical velocity, the precision of the 3D model in the near field still requires further verification for different outfall types.In this paper, the thermal discharge from a NPP with deep channel pattern is simultaneously studied by a 3D numerical model, physical model and the near field buoyant jet model Cormix.The results show that the 1 ℃ temperature rise range simulated by the 3D numerical model is close to the physical model, while the 4 ℃ temperature rise range of the 3D numerical model is remarkablely smaller than the physical model and Cormix results.Since the 3D numerical model is inadequate in simultaneously simulating the near and far field for the deep channel discharge pattern, further coupling research with the near zone buoyant jet model is needed to improve its applicability.