基于热流量积分的混凝土温控水管冷却边界模拟算法

以往用冷却水管离散模型迭代计算混凝土温度场时,水管边界被近似认为是第三类边界条件,此类边界条件的参数获取要通过试验并进行反演,试验费用较大且有时候可靠性不高。针对该问题,在热量平衡条件的基础上提出由与水管接触混凝土的热流量、水管的导热系数、管壁厚度和水管内壁温度推算水管外壁温度的新算法,并对原有迭代方法进行改进,解决迭代次数多和迭代可能无法收敛的问题。对比算例中,采用传统算法,模型边界处的误差可达到1.67℃,而采用该新算法,误差仅为0.3℃。应用所提方法对某混凝土块施工期混凝土温度场进行了仿真计算,计算值与实测值吻合较好,且迭代收敛速度较快,一般的迭代方法,需要迭代15次,而采用改进的迭代方...

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Bibliographic Details
Published in农业工程学报 Vol. 32; no. 9; pp. 83 - 89
Main Author 朱振泱 刘敏芝 强晟 相建方
Format Journal Article
LanguageChinese
Published 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京,100038%鄞州区水利工程质量与安全监督站,宁波,315100%河海大学水利水电工程学院,南京,210098 2016
Subjects
模型
混凝土
温度
迭代算法
温度
迭代算法
concrete
models
模型
temperature
iterative algorithm
混凝土
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Summary:以往用冷却水管离散模型迭代计算混凝土温度场时,水管边界被近似认为是第三类边界条件,此类边界条件的参数获取要通过试验并进行反演,试验费用较大且有时候可靠性不高。针对该问题,在热量平衡条件的基础上提出由与水管接触混凝土的热流量、水管的导热系数、管壁厚度和水管内壁温度推算水管外壁温度的新算法,并对原有迭代方法进行改进,解决迭代次数多和迭代可能无法收敛的问题。对比算例中,采用传统算法,模型边界处的误差可达到1.67℃,而采用该新算法,误差仅为0.3℃。应用所提方法对某混凝土块施工期混凝土温度场进行了仿真计算,计算值与实测值吻合较好,且迭代收敛速度较快,一般的迭代方法,需要迭代15次,而采用改进的迭代方法,只需迭代7次即可以达到稳定值。该算法能明确通水冷却的边界条件,节省试验费用,提高计算效率,有较好的工程应用价值。
Bibliography:Zhu Zhenyang,Liu Minzhi,Qiang Sheng,Xiang Jianfang（1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2. Yinzhou District Quality and Safety Supervision Station of Water Conservancy Projects, Ningbo 315100, China; 3. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China）
11-2047/S
temperature; models; concrete; iterative algorithm
When using the explicit iterative method to solve the temperature of mass concrete with cooling pipes, it is generally considered that the inner and outer surface of metal pipes can be neglected but the temperature difference cannot be neglected when using the plastic pipes. And the plastic pipes are usually regarded as the third boundary condition. For the past researchers, the coefficient of this kind of boundary condition can be got by experiment and inversion, which is yet expensive and may also not be reliable sometimes. To
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.09.012