發(fā)布時間：2024-05-30 02:13

　　鉛鉍合金(LBE),由于其良好的熱物理、材料和化學性質,被認為是加速器驅動次臨界系統(tǒng)(ADS)中冷卻劑的合適選擇。然而,以鉛鉍合金(LBE)作為主要冷卻劑的快堆裝置需要控制溶解氧活性以保護結構材料同時避免冷卻劑中的氧氣積聚。LBE中的氧濃度應高于結構材料上存在的保護性氧化物層的溶解極限,且應低于LBE中氧的溶解度極限以避免氧化鉛沉淀。氧化鉛質量交換器(PbO MX)可用來避免系統(tǒng)內(nèi)過量氧化和固體氧化物形成。質量交換器(PbO MX)包含氧化鉛球的填充床,這些氧化鉛球機械穩(wěn)定且隨機排列在圓柱形容器中。在Pb0層前后放置氧化鋁球以產(chǎn)生速度分布。質量交換器是通過冷卻劑流經(jīng)氧化鉛球床的過程來提供氧。LBE流經(jīng)Pb0球導致流動侵蝕,當LBE中的氧濃度飽和時,這類侵蝕成為質量交換器中Pb0重量損失的主要原因。本研究的重點是通過數(shù)值模擬估算LBE流動引起的侵蝕。使用計算流體力學軟件CFD作為分析工具研究該過程。涉及的主要步驟包括預處理,計算求解和后處理,侵蝕是一個復雜的現(xiàn)象,取決于許多因素。因此,還進行了參數(shù)研究以觀察顆粒大小、粒徑和粒子濃度對侵蝕速率的影響。該研究的模擬在ANSYS Fluent中...

【文章頁數(shù)】：57 頁

【學位級別】：碩士

【文章目錄】：
摘要
ABSTRACT
CHAPTER 1. INTRODUCTION
    1.1 NUCLEAR ENERGY
    1.2 EVOLUTION OF NUCLEAR POWER
    1.3 LEAD-COOLED FAST REACTOR
        1.3.1 Research and Development in LFRs
        1.3.2 Structural Corrosion in LFRs
    1.4 RESEARCH GOAL AND ITS SIGNIFICANCE
    1.5 RESEARCH METHODOLOGY
CHAPTER 2. LITERATURE REVIEW
    2.1 INTRODUCTION
    2.2 OXYGEN CONTROL IN LBE
    2.3 LEAD OXIDE MASS EXCHANGER (PBO MX)
    2.4 WORLDWIDE RESEARCH STATUS
        2.4.1 Brief History
        2.4.2 Progress in Last Decade
    2.5 EROSION
        2.5.1 Stages of Erosion
        2.5.2 Important Parameters
        2.5.3 Particle impact erosion
    2.6 PACKED BEDS
        2.6.1 Geometric Properties of Packed Beds
        2.6.2 Packing Regimes
    2.7 FLOW THROUGH PACKED BEDS
    2.8 MODELLING OF PACKED BEDS
CHAPTER 3. COMPUTATIONAL FLUID DYNAMICS
    3.1 INTRODUCTION
    3.2 APPLICATIONS OF CFD
    3.3 ADVANTAGES OF CFD
    3.4 ELEMENTS OF CFD
        3.4.1 Pre-processing
        3.4.2 Solving
        3.4.3 Post-Processing
    3.5 GOVERNING EQUATIONS
        3.5.1 Conservation Equations
        3.5.2 General Transport Equation
    3.6 TURBULENCE MODELLING
    3.7 RANS MODEL
        3.7.1 Boussinesq Hypothesis
        3.7.2 Eddy Viscosity Models
    3.8 SELECTION OF APPROPRIATE TURBULENCE MODELS
CHAPTER 4. MODELLING AND ANALYSIS
    4.1 INTRODUCTION
    4.2 METHODOLOGY
    4.3 ASSUMPTIONS AND UNCERTAINTIES
    4.4 GEOMETRIC MODEL
    4.5 MESH GENERATION
        4.5.1 Mesh Quality
        4.5.2 Mesh Quality Metrics
        4.5.3 Grid Independency
    4.6 PRELIMINARY MODEL SELECTION
        4.6.1 Turbulence Model Selection
        4.6.2 Near Wall Treatment
    4.7 DISCRETE PHASE MODEL
    4.8 SOLVER SETTINGS AND BOUNDARY CONDITIONS
CHAPTER 5. RESULTS AND DISCUSSION
    5.1 EFFECT OF PARTICLE VELOCITY
    5.2 EFFECT OF PARTICLE DIAMETER
    5.3 EFFECT OF PARTICLE CONCENTRATION
CHAPTER 6. CONCLUSION AND FURTHER WORK
    6.1 CONCLUSION
    6.2 RECOMMENDATION FOR FUTURE WORK
REFERENCES
ACKNOWLEDGEMENTS
PUBLICATIONS



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