沥青混凝土道路温度主动控制实验与数值模拟研究
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摘要
沥青混凝土路面易于吸收太阳辐射,在夏季会迅速升温软化,影响路面稳定性.主动冷却方法能有效带走热量,降低结构温度.基于U形管水冷换热器,建立了沥青混凝土主动冷却结构的实验模型,采用光源辐射模拟阳光辐射开展实验研究,并结合非稳态数值模拟方法,获得了不同辐射热流强度下,整体结构在不同加热时长后的三维温度场分布,提取了特征截面平均温度-时间变化规律,分析了热边界条件对结构温度变化特性的影响.研究结果表明,热边界条件对结构温度的具体数值有较大影响,但对特征截面的平均温度-时间变化特性影响很小;U形管水冷换热器能带走大量结构内部蓄热,有效降低沥青混凝土路面温度;主动冷却方法能够实现对沥青混凝土结构温度的有效控制;数值模拟结果与实验结果非常一致,能够准确揭示结构内部传热特性.
Asphalt concrete pavement is easy to absorb solar radiation, and will rapidly warm up and soften in summer, affecting the stability of the pavement. Active cooling method can effectively remove heat and reduce structure temperature. Based on U-tube water-cooled heat exchanger, an experimental model of asphalt concrete active cooling structure was established. Using light source radiation to simulate sunlight radiation to carry out experimental research, and combining with unsteady numerical simulation method, the three-dimensional temperature field distribution of the whole structure under different radiation heat flux intensity and different heating duration was obtained, the average temperature-time variation law of characteristic section was extracted, and the influence of thermal boundary conditions on the temperature variation characteristics of the structure was analyzed. The results show that the thermal boundary conditions have a great influence on the specific values of the structure temperature, but have little influence on the average temperature-time variation characteristics of the characteristic section. The U-tube water-cooled heat exchanger can take away a large amount of internal heat storage of the structure and effectively reduce the temperature of the asphalt concrete pavement. Active cooling method can effectively control the temperature of asphalt concrete structure. The numerical simulation results are very consistent with the experimental results, which can accurately reveal the internal heat transfer characteristics of the structure.
Asphalt concrete pavement is easy to absorb solar radiation, and will rapidly warm up and soften in summer, affecting the stability of the pavement. Active cooling method can effectively remove heat and reduce structure temperature. Based on U-tube water-cooled heat exchanger, an experimental model of asphalt concrete active cooling structure was established. Using light source radiation to simulate sunlight radiation to carry out experimental research, and combining with unsteady numerical simulation method, the three-dimensional temperature field distribution of the whole structure under different radiation heat flux intensity and different heating duration was obtained, the average temperature-time variation law of characteristic section was extracted, and the influence of thermal boundary conditions on the temperature variation characteristics of the structure was analyzed. The results show that the thermal boundary conditions have a great influence on the specific values of the structure temperature, but have little influence on the average temperature-time variation characteristics of the characteristic section. The U-tube water-cooled heat exchanger can take away a large amount of internal heat storage of the structure and effectively reduce the temperature of the asphalt concrete pavement. Active cooling method can effectively control the temperature of asphalt concrete structure. The numerical simulation results are very consistent with the experimental results, which can accurately reveal the internal heat transfer characteristics of the structure.
引文
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[4] RAJIB B,MALLIC,SANKHA B.Reduction of urban heat island effect through harvest of heat energy from asphalt pavement[C].2nd International Conference on Countermeasures to Urban Heat Island,Berkeley,2009.
[5] 蒯海东,薛金顺,高兴阳.温度和空隙率对沥青混合料疲劳断裂特性的影响[J].武汉理工大学学报(交通科学与工程版),2019,43(1):31-35.
[6] 王家主.热管对沥青混凝土温度场调节的室内模拟[J].公路,2011(4):105-108.
[7] 王家主.热管在沥青混凝土内部传热效率的影响因素分析[J].公路,2015(9):26-31.
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