热力发电
熱力髮電
열력발전
Thermal Power Generation
2015年
10期
58-62,67
,共6页
海上浮动核电站%温排水%热污染%稀释扩散规律%排放角度%环境流速%SIMPLE算法
海上浮動覈電站%溫排水%熱汙染%稀釋擴散規律%排放角度%環境流速%SIMPLE算法
해상부동핵전참%온배수%열오염%희석확산규률%배방각도%배경류속%SIMPLE산법
floating nuclear power plant%thermal discharge%thermal pollution%buoyant and diffusion rule%discharge angle%environmental velocity%SIMPLE algorithm
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。
海上浮動覈電站溫排水會導緻停泊水域溫度升高，研究其稀釋擴散規律併適噹控製排放水域溫度對于防止環境水體熱汙染具有重要意義。本文將溫排水排放過程簡化為橫流環境中的熱射流過程進行數值模擬。在有限體積法的基礎上，採用 SIMPLE 算法和 Realizable k-ε湍流模型建立瞭熱射流浮升過程的三維數學模型，併基于已有文獻實驗數據，驗證瞭該模型的準確性。分析瞭環境流速和排放口角度對溫排水熱影響範圍和程度的作用規律。結果顯示：環境流速較大時，對流換熱劇烈，排放角度對溫排水影響範圍較小；環境流速較小時，來流的遲刷作用減弱，排放角度對溫排水的影響範圍較大；相同工況下，在垂直流嚮平麵上排放角度的變化對中心溫度沿流嚮分佈影響較小，而在平行流嚮平麵上排放角度的變化對中心溫度分佈的影響較大，且環境流速對于中心溫度沿流嚮分佈影響較小。
해상부동핵전참온배수회도치정박수역온도승고，연구기희석확산규률병괄당공제배방수역온도대우방지배경수체열오염구유중요의의。본문장온배수배방과정간화위횡류배경중적열사류과정진행수치모의。재유한체적법적기출상，채용 SIMPLE 산법화 Realizable k-ε단류모형건립료열사류부승과정적삼유수학모형，병기우이유문헌실험수거，험증료해모형적준학성。분석료배경류속화배방구각도대온배수열영향범위화정도적작용규률。결과현시：배경류속교대시，대류환열극렬，배방각도대온배수영향범위교소；배경류속교소시，래류적충쇄작용감약，배방각도대온배수적영향범위교대；상동공황하，재수직류향평면상배방각도적변화대중심온도연류향분포영향교소，이재평행류향평면상배방각도적변화대중심온도분포적영향교대，차배경류속대우중심온도연류향분포영향교소。
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.
