【摘要】 对流换热是多年冻土地区路基对外热交换的重要形式。利用自行开发的热风环境试验机,考虑不同路面材料类型、风速变化、温度梯度3个因素,对影响冻土路基温度场的对流换热状况进行室内模拟试验研究。研究表明:风速、温度梯度、路面材料类型3个因素对于对流换热系数有着交互影响,随着风速与温度梯度的增加,对流换热系数呈上升趋势。沥青路面材料的对流换热系数较水泥路面材料稍大。研究中给出了不同状况下对流换热系数的回归公式,并分别给出青藏高原地区沥青混凝土路面及水泥混凝土路面对流换热系数的推荐值。更多还原

【Abstract】 Convective heat transfer is an important heat transfer approach for embankments in permafrost region.A heat transfer testing equipment was developed and adopted to simulate the heat transfer status of permafrost embankments in laboratory considering different pavement materials,wind velocity and temperature difference between wind and the material interface.The research results show that(1) wind velocity,temperature difference and pavement material have mutual influence on the heat transfer coefficient,the heat transfer coefficient rises with the increase of wind velocity and temperature difference;(2) the heat transfer coefficient of asphalt pavement is a little higher than that of concrete pavement.The regression formulas of heat transfer coefficient in different situations were presented,and the proper convective heat transfer coefficient for asphalt pavement and concrete pavement in Qinghai-Tibet plateau was suggested.更多还原