海上浮动核电站温排水会导致停泊水域温度升高，研究其稀释扩散规律并适当控制排放水域温度对于防止环境水体热污染具有重要意义。本文将温排水排放过程简化为横流环境中的热射流过程进行数值模拟。在有限体积法的基础上，采用 SIMPLE 算法和 Realizable k-ε湍流模型建立了热射流浮升过程的三维数学模型，并基于已有文献实验数据，验证了该模型的准确性。分析了环境流速和排放口角度对温排水热影响范围和程度的作用规律。结果显示：环境流速较大时，对流换热剧烈，排放角度对温排水影响范围较小；环境流速较小时，来流的冲刷作用减弱，排放角度对温排水的影响范围较大；相同工况下，在垂直流向平面上排放角度的变化对中心温度沿流向分布影响较小，而在平行流向平面上排放角度的变化对中心温度分布的影响较大，且环境流速对于中心温度沿流向分布影响较小。%The waste heat emissions of thermal discharge from floating nuclear power plants may have a negative thermal effect on the environment.Investigation on the buoyant and diffusion rules of thermal dis-charge from floating nuclear power plants and properly controlling the discharging temperature have great significance for seat water thermal pollution prevention.This paper simplified the thermal discharge process as thermal jet in cross flow to establish the 3D mathematic model for thermal jets floating process, on the basis of finite volume method and using the SIMPLE algorithm and Realizable k-εturbulence model. Then this model was verified by using the experimental data from reference[5 ].The thermal effect range and degree of environmental velocity and discharge angle on thermal discharge were investigated.The re-sults show that,at high ambient velocities,the convection heat transfer was intense so that the heat-affect-ed zone was influenced less by the emission angle,while at low ambient velocities,the influence of emission angle increased remarkably due to the weakness of ambient currents scouring effect.Under the same condi-tions,change of emission angle in vertical plane had less effect on the central temperature along stream,and it had dramatic effect when the plane was parallel to the stream.The environmental velocity had a little effect on the central temperature along the stream.
展开▼
