相变对土壤自然温度场影响研究  

STUDY ON EFFECT OF PHASE TRANSITION ON NATURAL SOIL TEMPERATURE FIELD

作　　者：刘晓燕[1] 刘佳佳[1] 郭琳[1] 刘立君[1] 李晓庆[1] 

机构地区：[1]东北石油大学土木建筑工程学院,大庆163318

出　　处：《太阳能学报》2011年第6期880-884,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50776014);黑龙江省青年基金项目(QC08c38);黑龙江省科技攻关项目(GB08A304)

摘　　要：利用土壤水热耦合迁移方程,首次考虑土壤和大气温度场的年周期性变化,建立有相变影响的土壤传热物理、数学模型,将土壤冻结过程是否考虑相变的数值模拟结果进行对比分析。模拟结果表明有相变时土壤温度随时间变化的曲线不再为光滑的余弦曲线,土壤冻结初期和融化过程相对于无相变土壤都有温度的平缓持续段;进入冻结期后有相变的土壤温度整体高于无相变的土壤,随着深度的增加,此温度差值增大。将模拟结果与实测值进行对比分析表明,得出该文给出的模型及计算方法基本正确,但还应考虑冰的阻抗作用。By using water and heat coupling transport equation in soil, the annual periodic variation of soil and atmosphere temperature field were considered for the first time, and the physics and math model with the influence of phase transition was established. The results of numerical simulation with or without the phase transition in the process of soil freezing were compared. The results show that when phase transition is considered, the curve of soil temperature varying with time is not a smooth cosine curve, the soil temperature continuous gentle in the early freeze and thaw process; in freezing period the whole soil temperature with phase transition is higher than without it and as depth increasing, the temperature difference increases. According to the comparison between simulation resuits and measured values, the model and method used in this paper are basically correct, but the role of ice impedance should also be considered.

关 键 词：土壤 相变 非稳态 温度场 数值模拟 测试 分析 

分 类 号：TK52[动力工程及工程热物理—热能工程]