温度环境试验中试件温度稳定时间估算方法

摘要

研究了温度环境试验中试件温度稳定时间的估算方法。以非稳态传热学理论为基础，分别用集中参数法和有限元法计算、分析试件的温度稳定时间。给出了集中参数法确定试件温度稳定时间的计算公式，确定了集中参数法的适用范围。研究了试件外表面与试验介质之间的传热系数确定方法，考虑风速、试件外形和试验介质性质对传热的影响。将集中参数法与有限元法计算、分析结果进行比较，相符性较好。%Based on transient heat transfer theory, temperature stabilization time was analyzed by lumped parameter method and finite element method respectively. The calculation formula of lumped parameter method and is application limitation was put forward. Considering the effect of wind speed, sample medium, and outer surface, the method to determine the heat transfer coefficient between sample medium and outer surface was studied. The results of lumped parameter method were compared with that of finite element method, and it was founded that they are consistent with each other.