滨海核电厂深水温排放近远区动态耦合模拟

Near and Far Field Dynamically Coupled Simulation of Underwater Thermal Discharge From a Coastal Nuclear Power Plants

滨海火、核电厂温排水引起的环境问题广受关注,数学模型是评价温排水影响的重要手段,而国内现有温排水数值计算模型的近区模拟失真问题尚未很好解决。我们引入近区射流模型(Corjet)与远区数学模型(Delft3D)耦合模拟技术,采用分散汇流(DESA)方法实现对射流掺混卷吸效应的模拟,通过模型交叉调用实现近远区动态耦合。将耦合方法应用于工程案例,并与以往常用的远区模型直接点源方法进行了对比,结果表明近远区分散汇流耦合方法能够更合理地反映深水排放的浮力效应,模拟的垂向温度分布及温升影响范围与物理模型趋势更为接近,能有效提高高温升区模拟精度,该模拟方法具有较好的推广应用价值。

Thermal waste water discharge from coastal thermal plants and nuclear power plants brings great environmental concern.Numerical model is an important approach to evaluate the impact of the thermal discharge.However,the models usually used in China are not able to reflect the mixing in near field correctly.In this paper,a coupled method of near field model,Corjet,and far field model,Delft3 D,is introduced.The distributed entrainment sink approach（DESA）is adopted to simulate the entrainment process of buoyant jet.Dynamical coupling of near field and far field is realized by cross-calling of the two models.Based on a case study,the coupled model is compared with the far field model with a direct single source,and the result shows that the former can reflect buoyant effect better and get temperature vertical distribution and temperature rising range more closer to the result of physical model.This suggests that the coupled method can improve the skill of the far field model in temperature high-rising area.This method is promising for thermal water dispersion simulation in practice.