摘要
为准确分析基于热管技术的机场道面融雪系统工作性能,综合考虑地热能、机场道面、热管间的传热特性,建立了热管加热融雪道面足尺试验系统;基于长期实测数据对融雪系统的道面融雪性能、温度场分布特性及其影响因素进行了分析;并在此基础上,通过研究融雪系统地下土壤热源热量长期消耗及回补特性探讨了融雪系统的可持续性工作性能。研究结果表明:基于热管技术的机场道面融雪系统可在冬季不改变道面温度分布特性的基础上,自动提高道面温度约15℃,有利于抑制道面结冰并融化道面积雪;在热管道面融雪过程中,当道面无雪率超过40%后,道面融雪过程将进入加速期;减少热管与道面表面的竖直距离,降低相邻热管间的水平间距均可改善热管道面温度分布规律,并有效提高道面融雪效率,而热管直径的变化对道面融雪性能影响相对较弱;随着气温降低,热管道面融雪效率逐渐下降,且当气温低于-9℃时,热管道面融雪性能受到较大限制;积雪经过适当压实作用,可缩短热管道面融雪时间;冬季地下热管的取热作用使得地下土壤温度约降低10℃,而夏季地下土壤温度逐渐恢复,随时间大致呈周期性变化,表明地下土壤可为热管道面融雪系统长期提供热量,持续保障热管道面融雪性能,实现机场道面冬季安全运行。
In order to analyze the working performance of a heat pipe snow-melting airport pavement system,a full-scale pavement snow-melting system was built.The heat transfer characteristics of the ground soil,pavement,and heat pipe were considered in the system.The snow-melting performance and temperature distribution characteristics of the heat pipe pavement were analyzed using data collected over the past several years.In addition,the sustainability of the snow-melting system was analyzed using the temperature data of ground soil.The experimental results show that the heat-pipe system does not change the temperature distribution characteristics of pavement surface;rather,it automatically raises the temperature by up to 15℃in winter.Therefore,the heat pipe pavement can melt snow and de-ice in winter.During the snow-melting process of the heat pipe pavement,it enters an acceleration phase in which the snow-free area ratio is more than 40%.The temperature distribution characteristics and snow-melting performance of the heat pipe pavement can be improved by selecting a shallow pipe-embedded depth and smaller pipe spacing.The working performance of the heat pipe pavement is less affected by the diameter of the heat pipe.The snow-melting performance of the heat pipe pavement decreased with ambient air temperature.In particular,the threshold value of the pavement is an ambient air temperature of over-9℃.The snow-melting time of the system decreased with the appropriate compaction on snowfall.The full-year temperature data shows that the temperature of the heat pipe ground soil decreases 10℃in winter owing to the heat transfer of the heat pipe.However,the heat of the ground soil is recovered in the summer.The temperature of the heat pipe ground soil displays periodic variations.Therefore,the ground soil will provide heat to the pavement consistently to ensure the safe operation of the runway in winter.
作者
谭忆秋
张驰
陈凤晨
苏新
徐慧宁
TAN Yi-qiu;ZHANG Chi;CHEN Feng-chen;SU Xin;XU Hui-ning(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China;State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China;China Airport Construction Group Corporation of CAAC,Beijing 100621,China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2019年第4期137-147,共11页
China Journal of Highway and Transport
基金
国家自然科学基金项目(U1633201)
民航科技重大专项项目(MHRD20140107)
关键词
道路工程
融雪道面
热管技术
温度分布特性
融雪性能
地热能
road engineering
snow-melting airport pavement
heat pipe technology
temperature distribution characteristic
snow melting performance
ground soil heat
