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冰川冻土  2014 

季节冻土区埋地管道水温的变化规律及其影响因素分析

DOI: 10.7522/j.issn.1000-0240.2014.0100, PP. 836-844

Keywords: 季节冻土区,埋地管道,最不利水温,降温速率,仿三维数值方法

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Abstract:

埋地管道是减少寒冷地区冬季冻害的常用铺设方式,深入认识埋地管道的水温变化规律可以为减小管道埋设深度、降低管道冻害提供理论依据,对当前季节冻土区农牧民集中式供水工程的推进具有指导意义.采用仿三维数值方法建立了管道水温的计算模型,讨论了含水量、地表温度、管道埋深等6个主要因素对埋地管道最不利水温的影响.分析结果表明,无论上述因素如何变化,管道最不利水温均随输送距离的增加而下降.首先,随着含水量的增加、地表温度的升高以及管道埋深的加深,管道的降温速率不断减小并具有先快后慢的特点;其次,随着管径的减小、流速的降低,管道降温速率增大,且降温速率和流速之间具有近似的倒数关系.另外,随着入口温度的升高,管道降温速率将呈指数形式不断增加.

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