本文關(guān)鍵詞： 聚變 水冷包層 兩元混合球床 熱機(jī)械性能 離散元方法　出處：《中國(guó)科學(xué)技術(shù)大學(xué)》2017年博士論文　論文類型：學(xué)位論文

【摘要】：作為中國(guó)聚變工程實(shí)驗(yàn)堆(CFETR)候選包層概念之一的水冷固態(tài)陶瓷增殖劑包層(WCCB)正在開(kāi)展設(shè)計(jì)工作。WCCB采用新型的混合增殖球床(Li2TiO3Be12Ti)作為產(chǎn)氚載體,同時(shí)也布置少量Be球床倍增中子。包層球床的傳熱性能和力學(xué)性能直接影響包層熱工水力與結(jié)構(gòu)設(shè)計(jì)的可靠性和安全裕度,因此本論文旨在針對(duì)WCCB包層球床構(gòu)建球床熱機(jī)械分析模型,為WCCB包層設(shè)計(jì)與研發(fā)提供基礎(chǔ)數(shù)據(jù)支持。首先,本論文基于離散元方法(DEM),開(kāi)發(fā)了典型隨機(jī)球床填充程序,研究了一元球床和WCCB混合增殖球床的填充結(jié)構(gòu),獲得了滿足WCCB設(shè)計(jì)要求的混合球床填充方案。其次,由于目前缺少混合材料球床有效熱導(dǎo)率理論模型,論文基于一元球床的SZB模型,經(jīng)過(guò)理論推導(dǎo),提出了兩元混合球床有效熱導(dǎo)率唯象理論模型(M-SZB),并經(jīng)過(guò)了初步驗(yàn)證�；贛-SZB模型獲得的WCCB混合增殖球床有效熱導(dǎo)率約為2.0 W/(m·K)到4.0 W/(m ·K),導(dǎo)熱能力較一元鋰陶瓷球床提高約2～4倍。此外,本論文提出基于DEM-CFD耦合方法分析球床傳熱,建立了對(duì)一元/兩元球床普遍適用的有效熱導(dǎo)率計(jì)算模型。該模型計(jì)算結(jié)果與一元球床(Li2TiO3球床、Li4SiO4球床和Be球床)有效熱導(dǎo)率文獻(xiàn)實(shí)驗(yàn)數(shù)據(jù)吻合較好,也與一元球床的SZB理論模型計(jì)算結(jié)果一致。此外,本論文應(yīng)用該方法分析了WCCB兩元混合增殖球床傳熱,結(jié)果表明其有效熱導(dǎo)率也為2.0 W/(m·K)到4.0 W/(m · K),與M-SZB理論模型計(jì)算結(jié)果基本一致。最后,本論文基于DEM方法,開(kāi)發(fā)了球床熱場(chǎng)和力場(chǎng)雙向全耦合分析模型�；谠摲椒ǔ醪椒治隽瞬煌d荷模式(加載、卸載、循環(huán)載荷)下的球床熱機(jī)械響應(yīng)。
[Abstract]:WCCB, one of the candidate cladding concepts for CFETR, is being designed. WCCB uses a new hybrid proliferating ball bed (WCCB). Li2TiO3Be12Ti) is used as carrier for tritium production. At the same time, a small number of be spherical beds are arranged to multiply neutrons. The heat transfer and mechanical properties of the blanket directly affect the reliability and safety margin of the thermal hydraulic and structural design of the cladding. Therefore, the purpose of this paper is to build a thermal mechanical analysis model for the WCCB cladding ball bed to provide basic data support for the design and development of WCCB cladding. Firstly, this paper is based on discrete element method (DEM). A typical random ball bed filling program was developed, and the filling structure of monolithic ball bed and WCCB mixed multiplication ball bed was studied, and the mixed ball bed filling scheme satisfying the requirements of WCCB design was obtained. Secondly. Due to the lack of theoretical model of effective thermal conductivity of ball bed with mixed materials, this paper is based on the SZB model of monolithic ball bed. A phenomenological model of effective thermal conductivity of two-element mixed spherical bed is presented. The effective thermal conductivity of WCCB mixed multiplication spherical bed based on M-SZB model is about 2.0 W / m 路K) to 4.0 W / L m 路K). The thermal conductivity is about 2 ~ 4 times higher than that of the monolithic lithium ceramic ball bed. In addition, the DEM-CFD coupling method is proposed to analyze the heat transfer in the spherical bed. An effective thermal conductivity calculation model for monolithic / two-element spherical bed is established, and the calculated results are compared with that of single-element spherical bed Li _ 2TiO _ 3 spherical bed. The experimental data of effective thermal conductivity of Li4SiO4 and be are in good agreement with the results of SZB model. In this paper, the heat transfer of WCCB two-element mixed multiplication spherical bed is analyzed by using this method. The results show that the effective thermal conductivity is also from 2.0 W / m 路K to 4.0 W / M 路K). The results are in good agreement with M-SZB theoretical model. Finally, this paper is based on DEM method. A bidirectional fully coupled analysis model of the thermal field and the force field of the spherical bed is developed. Based on this method, the thermo-mechanical response of the spherical bed under different load modes (loading, unloading, cyclic load) is preliminarily analyzed.
【學(xué)位授予單位】：中國(guó)科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TL64

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