Jie Cheng, Yibo Zhang, Di Wu, Xiaobo Zeng, Xu Han, Jianjun Wang
{"title":"静止和轧制条件下c型换热器热分层特性的实验研究","authors":"Jie Cheng, Yibo Zhang, Di Wu, Xiaobo Zeng, Xu Han, Jianjun Wang","doi":"10.1016/j.nucengdes.2025.114213","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the thermal stratification characteristics and operating performance of a C-shaped heat exchanger in the secondary passive residual heat removal system (PRHRS) under stationary and rolling conditions, relevant to Offshore Floating Nuclear Power Plants (OFNPs). A scaled-down experimental facility was designed to simulate the PRHRS, incorporating a swaying platform to replicate marine rolling motions. Experiments were conducted under varying rolling amplitudes (15°, 24°) and periods (8 s, 14 s), with heating powers of 34 kW and 31 kW, to analyze the effects of dynamic conditions on heat removal capacity, system stability, and thermal stratification. Key findings reveal that rolling motion enhances heat removal during the initial operational phase by promoting fluid mixing and natural circulation. However, under quasi-steady states, rolling conditions induced periodic oscillations in system pressure, mass flow rate, and heat removal power, synchronized with the imposed rolling period. Thermal stratification was weakened under rolling motion due to enhanced fluid mixing, though the duration of stratification persistence increased. Notably, larger rolling amplitudes reduced the heat exchanger outlet temperature, while longer periods lowered system pressure. These results provide critical insights into optimizing PRHRS design for OFNPs operating in dynamic marine environments.</div></div>","PeriodicalId":19170,"journal":{"name":"Nuclear Engineering and Design","volume":"442 ","pages":"Article 114213"},"PeriodicalIF":1.9000,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental study on thermal stratification characteristics of C-shaped heat exchanger under stationary and rolling conditions\",\"authors\":\"Jie Cheng, Yibo Zhang, Di Wu, Xiaobo Zeng, Xu Han, Jianjun Wang\",\"doi\":\"10.1016/j.nucengdes.2025.114213\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigates the thermal stratification characteristics and operating performance of a C-shaped heat exchanger in the secondary passive residual heat removal system (PRHRS) under stationary and rolling conditions, relevant to Offshore Floating Nuclear Power Plants (OFNPs). A scaled-down experimental facility was designed to simulate the PRHRS, incorporating a swaying platform to replicate marine rolling motions. Experiments were conducted under varying rolling amplitudes (15°, 24°) and periods (8 s, 14 s), with heating powers of 34 kW and 31 kW, to analyze the effects of dynamic conditions on heat removal capacity, system stability, and thermal stratification. Key findings reveal that rolling motion enhances heat removal during the initial operational phase by promoting fluid mixing and natural circulation. However, under quasi-steady states, rolling conditions induced periodic oscillations in system pressure, mass flow rate, and heat removal power, synchronized with the imposed rolling period. Thermal stratification was weakened under rolling motion due to enhanced fluid mixing, though the duration of stratification persistence increased. Notably, larger rolling amplitudes reduced the heat exchanger outlet temperature, while longer periods lowered system pressure. These results provide critical insights into optimizing PRHRS design for OFNPs operating in dynamic marine environments.</div></div>\",\"PeriodicalId\":19170,\"journal\":{\"name\":\"Nuclear Engineering and Design\",\"volume\":\"442 \",\"pages\":\"Article 114213\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2025-06-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nuclear Engineering and Design\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0029549325003905\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"NUCLEAR SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0029549325003905","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Experimental study on thermal stratification characteristics of C-shaped heat exchanger under stationary and rolling conditions
This study investigates the thermal stratification characteristics and operating performance of a C-shaped heat exchanger in the secondary passive residual heat removal system (PRHRS) under stationary and rolling conditions, relevant to Offshore Floating Nuclear Power Plants (OFNPs). A scaled-down experimental facility was designed to simulate the PRHRS, incorporating a swaying platform to replicate marine rolling motions. Experiments were conducted under varying rolling amplitudes (15°, 24°) and periods (8 s, 14 s), with heating powers of 34 kW and 31 kW, to analyze the effects of dynamic conditions on heat removal capacity, system stability, and thermal stratification. Key findings reveal that rolling motion enhances heat removal during the initial operational phase by promoting fluid mixing and natural circulation. However, under quasi-steady states, rolling conditions induced periodic oscillations in system pressure, mass flow rate, and heat removal power, synchronized with the imposed rolling period. Thermal stratification was weakened under rolling motion due to enhanced fluid mixing, though the duration of stratification persistence increased. Notably, larger rolling amplitudes reduced the heat exchanger outlet temperature, while longer periods lowered system pressure. These results provide critical insights into optimizing PRHRS design for OFNPs operating in dynamic marine environments.
期刊介绍:
Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology.
Fundamentals of Reactor Design include:
• Thermal-Hydraulics and Core Physics
• Safety Analysis, Risk Assessment (PSA)
• Structural and Mechanical Engineering
• Materials Science
• Fuel Behavior and Design
• Structural Plant Design
• Engineering of Reactor Components
• Experiments
Aspects beyond fundamentals of Reactor Design covered:
• Accident Mitigation Measures
• Reactor Control Systems
• Licensing Issues
• Safeguard Engineering
• Economy of Plants
• Reprocessing / Waste Disposal
• Applications of Nuclear Energy
• Maintenance
• Decommissioning
Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.