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摘要: 为了获得沥青路面微波热再生过程的温度场, 基于传热学理论, 分析了微波加热过程的传热形式, 建立了三维非稳态的传热模型, 研究了传热模型的边界条件, 求解了对流换热系数及辐射换热发射率, 根据能量守恒原理, 确定了内热源强度, 实现了电场到热场的转化。采用交替方向显(ADE) 格式, 提出了传热模型的数值解法, 对实测温度进行拟合, 并建立了传热边界条件数学模型, 仿真求得模型的可视化数值解。结果发现: 加热450 s时, 沥青混合料大部分区域接近70℃, 加热600 s时, 达到80℃, 加热到750 s时, 温度迅速上升到110℃左右, 这表明热量传递随加热时间是非线性的, 必须精确地选择加热时间以保证修补质量。Abstract: In order to achieve the temperature field of microwave hot recycling for asphalt pavement, heat transfer form was analyzed based on heat transfer theory, the corresponding 3D unsteady heat transfer model was built, boundary conditions were studied, convective heat transfer coefficient and radiation heat transfer emissivity were solved, the strength of internal heat source was studied according to energy conservation principle, and transformation between electric field and thermal field was realized, the numerical solution of heat transfer model was researched by adopting alternation direction explicit (ADE) scheme, the mathematic models of heat transfer boundary conditions were established by fitting experimental temperatures, and visualized numerical solution was obtained by simulation.Computation result shows that the temperatures of asphalt mixture in most region approach to 70 ℃ after heating for 450 s, reach about 80 ℃ after heating for 600 s, and reach about 110 ℃ rapidly after heating for 750 s; heat transfer is nonlinear and the heating time must be chosen accurately to guarantee repair quality.
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表 1 横向边界温度
Table 1. Temperatures in horizontal boundary
℃ τ/s x/m -0.06 -0.03 0 0.03 0.06 240 16.6 20.4 16.2 14.2 12.4 360 13.4 19.6 18.4 18.0 13.4 480 19.2 21.0 19.2 18.6 15.6 600 23.6 28.2 26.6 24.6 21.4 
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表 2 纵向边界温度
Table 2. Temperatures in vertical boundary
τ/s y/m -0.045 -0.015 0.015 0.045 240 17.6 21.8 22.8 19.2 360 16.2 25.8 24.8 19.2 480 19.6 27.2 26.2 19.8 600 22.6 35.2 40.2 25.6
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[1] 戴强民. 公路施工机械[M]. 北京: 人民交通出版社, 2001. [2] PAOLOL B. Specific heat, polarization and heat conduction in microwave heating systems: a nonequilibrium thermodynamic point of view[J]. Acta Materialia, 2006, 54 (7): 1843-1849. doi: 10.1016/j.actamat.2005.11.042 [3] 杜顺成, 戴经梁. 沥青混合料永久变形评价指标[J]. 中国公路学报, 2006, 19 (5): 18-22. doi: 10.3321/j.issn:1001-7372.2006.05.004DU Shun-cheng, DAI Jing-liang. Permanent deformation evaluation index of asphalt mixture[J]. China Journal of Highway and Transport, 2006, 19 (5): 18-22. (in Chinese) doi: 10.3321/j.issn:1001-7372.2006.05.004 [4] 王鹏, 曾凡奇, 黄晓明. 沥青高温性能指标的灰色关联度分析[J]. 交通运输工程学报, 2006, 6 (3): 32-36. doi: 10.3321/j.issn:1671-1637.2006.03.008WANG Peng, ZENG Fan-qi, HUANG Xiao-ming. Grey relation degree analysis of high-temperature performance indexes of asphalt[J]. Journal of Traffic and Transportation Engineering, 2006, 6 (3): 32-36. (in Chinese) doi: 10.3321/j.issn:1671-1637.2006.03.008 [5] 秦健, 孙立军. 沥青路面温度场的分布规律[J]. 公路交通科技, 2006, 23 (8): 18-21. doi: 10.3969/j.issn.1002-0268.2006.08.005QI NJian, SUN Li-jun. Study on asphalt pavement temperature field distribution pattern[J]. Journal of Highway andTransportation Research and Development, 2006, 23 (8): 18-21. (in Chinese) doi: 10.3969/j.issn.1002-0268.2006.08.005 [6] MINHOTO, MANUEL J C. Predicting asphalt pavement temperature with a three-di mensional finite element method[R]. Washington DC: Transportation Research Record 1919, 2005. [7] YI N H M, BUTTLAR W G, PAULI NO G H. Simplified solution for periodic thermal discontinuities in asphalt overlays bonded to rigid pavements[J]. Journal of Transportation Engineering, 2007, 133 (1): 39-46. doi: 10.1061/(ASCE)0733-947X(2007)133:1(39) [8] WU X, THOMAS J R, DAVIS W A. Control of thermal runaway in microwave resonant cavities[J]. Journal of Applied Physics, 2002, 92 (6): 3374-3380. doi: 10.1063/1.1501744 [9] HERIBERTOJ D, MICHAEL H T. Implementation of the pyramidal-horn antenna radiation-pattern equations using mathcad[J]. IEEE Antennas and Propagation Magazine, 1999, 41 (5): 96-99. doi: 10.1109/74.801520 [10] 朱松青, 史金飞, 王鸿翔. 沥青路面现场微波加热再生模型与实验[J]. 东南大学学报: 自然科学版, 2006, 36 (3): 393-396. doi: 10.3321/j.issn:1001-0505.2006.03.012ZHUSong-qing, SHI Jin-fei, WANG Hong-xiang. Modeling and experi ment of microwave heating for hot in-place recycling of asphalt pavements[J]. Journal of Southeast University: Natural Science Edition, 2006, 36 (3): 393-396. (in Chinese) doi: 10.3321/j.issn:1001-0505.2006.03.012 [11] CUCCURULLO G, BERARDI P G, CARFAGNA R, et al. IRtemperature measurement in microwave heating[J]. Infrared Physics and Technology, 2002, 43 (3-5): 145-150. doi: 10.1016/S1350-4495(02)00133-0 [12] LI NDROTH D P, BERGLUND W R, WI NGQUIST C F. Microwave thawing of frozen soils and gravels[J]. Journal of Cold Regions Engineering, 1995, 9 (2): 53-63. doi: 10.1061/(ASCE)0887-381X(1995)9:2(53) -
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