基于热流量积分的混凝土温控水管冷却边界模拟算法

发布时间：2018-03-31 03:12

  本文选题：温度　切入点：模型　出处：《农业工程学报》2016年09期

【摘要】：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。
[Abstract]:In the past, when the discrete model of cooling water pipe was used to iteratively calculate the temperature field of concrete, the boundary of water pipe was considered to be the third kind of boundary condition, and the parameters of the boundary condition were obtained by experiment and inversion. The cost of the test is high and sometimes the reliability is not high. In view of this problem, based on the heat balance condition, the heat flux of concrete in contact with the water pipe and the thermal conductivity of the pipe are proposed. A new algorithm for calculating the outer wall temperature of water pipe by using the thickness of pipe wall and the temperature of inner wall of pipe is proposed, and the original iterative method is improved to solve the problems that the number of iterations and the convergence of iteration may not converge. The error at the boundary of the model can reach 1.67 鈩，

本文编号：1688881