核主泵（PLR泵）是核反應(yīng)系統(tǒng)中重要的組成部分之一。其工作原理是在高壓條件下驅(qū)動(dòng)制冷劑循環(huán)流動(dòng)，從而帶走核反應(yīng)堆產(chǎn)生的熱量。為實(shí)現(xiàn)核主泵的密封功能，低溫清洗流從泵上端灌入。流體在由泵軸和泵殼所形成的環(huán)形間隙中會產(chǎn)生多種不同形態(tài)的泰勒渦（亦稱泰勒科特流）。由于循環(huán)熱流與清洗冷流之間存在高溫差（近200攝氏度），泰勒科特流會造成溫度波動(dòng)并在長時(shí)間工作下產(chǎn)生熱疲勞，最終在軸和殼的表面形成裂縫。 本論文通過數(shù)值模擬研究溫差以及軸的旋轉(zhuǎn)速度對泰勒科特流具體結(jié)構(gòu)的影響。使用的數(shù)值模擬求解器的可靠性通過與現(xiàn)有實(shí)驗(yàn)數(shù)據(jù)的比對得到了可靠驗(yàn)證。通過對流體結(jié)構(gòu)的具體模擬分析，本論文主要闡述了以下新的物理理解及發(fā)現(xiàn):核主泵工況下，流體的圓周波速在保持計(jì)算域結(jié)構(gòu)不變的基礎(chǔ)上為常值。因?yàn)榇鬁夭畹拇嬖�，靠近環(huán)形間隙與熱流體腔室連接處的泰勒渦會被明顯拉伸。由于浮力效應(yīng)，一股熱流向上涌入環(huán)形間隙并貼近軸面，阻礙了泰勒渦的向下移動(dòng)和軸向振動(dòng)。加大溫差和提高轉(zhuǎn)速均能夠?qū)е铝黧w（溫度）振動(dòng)頻率和圓周波數(shù)。模擬所預(yù)測的軸向最大溫度波動(dòng)位置與現(xiàn)有實(shí)驗(yàn)結(jié)果有很好的吻合。本項(xiàng)目對核主泵中泰勒科特流的物理性質(zhì)作了深入分析。所獲的結(jié)論有...

【文章頁數(shù)】：89 頁

【學(xué)位級別】：碩士

【文章目錄】：
Abstract
摘要
1 INTRODUCTION
    1.1 Thermal Fatigue Problems on PLR Pump
        1.1.1 Introduction of the PLR Pump
        1.1.2 Crack Issues in the PLR Pump
        1.1.3 Early Studies on Thermal Fatigue Problems
    1.2 Typical States of Taylor-Couette Flow
        1.2.1 Circular Couette Flow
        1.2.2 Taylor-Couette Flow
        1.2.3 Wavy Taylor-Couette Flow
        1.2.4 Taylor-Couette Flow with Higher Taylor Number
        1.2.5 Taylor-Couette-Poiseuille Flow
        1.2.6 Thermal Effect on Taylor-Couette Flow
    1.3 Research Objectives and Thesis Organization
2 COMPUTATIONAL DETAILS
    2.1 CFD Solver
    2.2 Boundary Conditions
    2.3 Verification for Laminar Flow Model
    2.4 Computational Domains
        2.4.1 Simplified Domain Applied in CFD Validation
        2.4.2 Real PLR Pump Simulation
    2.5 Mesh Independence Study
3 CFD VALIDATION
    3.1 Taylor-Couette Flow
    3.2 Wavy Taylor-Couette Flow
    3.3 Taylor-Couette Flow with Temperature Gradient
4 RESULTS AND DISCUSSION
    4.1 Influence of Temperature Difference
        4.1.1 Cross-correlation Between Velocity and Temperature
        4.1.2 Results with Uniform Temperature Field
        4.1.3 Effect of Temperature Difference on PLR Pump Flow
        4.1.4 Further Analysis on Structures and Behaviors of PLR Pump Flow
    4.2 Influence of Rotating Speed
5 CONCLUSIONS AND FUTURE WORKS
    5.1 Conclusions
    5.2 Recommendations for Future Simulation and Design Optimizations
ACKNOWLEDGMENTS
Appendix A
Appendix B
Appendix C
Appendix D
Bibliography



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