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电弧风洞加热条件下聚四氟乙烯烧蚀热响应特性
郝金波1,那伟1,陈政伟1
北京航天长征飞行器研究所,北京 100076
摘要:
高温加热条件下,由于聚四氟乙烯的热解,对烧蚀温度场计算结果有较大影响,为了提高聚四氟乙烯烧蚀温度场计算精度,建立了聚四氟乙烯烧蚀温度场计算方法,对电弧风洞加热条件下聚四氟乙烯表面烧蚀热响应特性进行了验证研究。理论计算和试验测量结果对比表明:230~323 ℃升温区间内,随时间增长,温度逐渐升高,理论计算与试验测量结果变化趋势一致;323~680 ℃升温区间内,随时间增长,试验测量温度逐渐升高,理论计算温度为定值,理论计算与试验测量结果存在一定偏差;680~390 ℃降温区间内,随时间增长,温度降低,理论计算高于试验测量值,这与理论计算烧蚀量存在偏差有关。采用聚四氟乙烯材料烧蚀温度场计算方法,可以有效模拟高温加热条件下聚四氟乙烯热响应特性,从而为产品设计提供参考。
关键词:  聚四氟乙烯  烧蚀热响应  温度场
DOI:10.12044/j.issn.1007-2330.2019.05.003
分类号:TQ12
基金项目:
Thermal Effect Analysis of Polytetrafluoroethylene Under Arc Heater High Temperature Environment
HAO Jinbo1,NA Wei1,CHEN Zhengwei1
Beijing Institute of Space Long March Vehicle,Beijing 100076
Abstract:
Under high temperature heating condition,calculation result of the temperature profile of the the polytetrafluoroethylene was effect by the dynamic ablation pyrolysis greatly.To improve the computing precision of the temprature profile,the method for computing the ablation temperature field for polytetrafluoroethylene has been set up,which has been tested by the thermal response charactericstic of the polytetrafluoroethylene under arc heater high temperature environment.By comparing the theoretical and the experimental results under arc heater high temperature environment,the results show that the temperature increases with the time passes during 230 ℃ to 323 ℃ temperature rising zone. The theoretical result changes in the same tendency with the experimental result.During 323 ℃ to 680 ℃ temperature rising zone,the temperature of experiment increases with the time passes.When the theoretical temperature is fixed,the theoretical result deviates from the experimental result.During 680 ℃ to 390 ℃ temperature reducing zone,the temperature of experiment decreases with the time passes.The theoretical temperature is higher than that of the experimental result. It is associated with the computing deviation of the ablative data.By using ablation temperature computing method, it can simulate the thermal response characteristics of the polytetrafluoroethylene under the arc heater high temperature environment effectively.It can provide reference for the design of products.
Key words:  Polytetrafluoroethylene  Ablation thermal effect  Temperature profile