含湿土壤热湿迁移过程的试验研究大学毕设论文.doc

0 河北工业大学城市学院毕业设计说明书(论文) 作者: 杨维杰学号: 063687 系: 能源与环境工程学院专业: 热能与动力工程题目: 含湿土壤热湿迁移过程的试验研究指导者: 王恩宇副教授评阅者: 2010 年5月 30日 1 毕业设计(论文)中文摘要含湿土壤热湿迁移过程的试验研究摘要: 本文以高温储热为背景,分析了相关的文献资料,研究了含湿土壤中高温条件下的热湿迁移现象,为揭示热湿迁移的本质奠定了一定的基础,并为实际的含湿土壤高温储热系统的设计提供了理论依据。该课题的研究是以试验研究为主在前人的试验台基础上做了进一步改进,从不同的角度揭示含湿土壤高温热湿迁移规律,在验证前人的理论的基础上得出新的试验结论。试验研究中,分别测试了不同高温排热温度条件下,土壤中温度场和湿度场随时间的变化全过程,进而分析了排热温度、土壤初始含水率对排热速率、取热速率的影响规律,获得了高温条件下含湿土壤中热湿迁移的基本规律。实验结果表明,温度场和湿度场变化规律相似。温度场受水分迁移和远边界传热的影响温度在达到峰值以后,温度逐渐降低并最后趋于稳定。水分主要受温度梯度和重力的影响沿径向和垂直方向都发生了迁移。高温储热时温度场和湿度场是相互影响的,同时不可忽略水分迁移的影响。关键词:含湿土壤,热湿迁移,高温储热,非饱和土壤,试验研究 2 毕业设计(论文)外文摘要 Title ANALYSIS RESEARCH OF HEAT AND MOISTURE MIGRATION IN WATERY SOIL AT HIGH-TEMPERATURE Abstract Inthis paper, relevant literature essed and the phenomenon ofheat and moisture transfer inhigh-temperature watery soils isstudied onthe background ofhigh-temperature thermal storage, which lay acertain foundation ofseeking the nature ofheat and provide atheoretical basis todesign high-temperature thermal storage systems. The research ofissue isbased onthe experimental studies .The further improvement ismade on the foundation offormer , the law ofmoisture transfer in the process ofhigh-temperature watery soils isrevealed from various aspects ,and new conclusions are drawn byverifying the previous results. During the experiment ,the fields oftemperature and moisture are described under the conditons ofvarious temperature ofheat source,flow and initial moisture,and then the rate ofinjection and extraction influenced bythe three factors above isanalyzed, the basic law ofheat and moisture migration inthehigh-temperature watery soils isrevealed. Experimental result shows that the variation oftemperature and moisture has asimilar law. Affected bythe moisture migration and heat transfer offar border, after reaching apeak temperature, the temperature gradually fall down and eventually stabilizes. Affected bythe temperature gradient and the gravity, moisture content insoil will move along the radial