【摘要】 针对青藏高原多年冻土区通风管路堤,研究了加装采风口对通风管路堤降温效果的增强作用。基于路堤通风管的进风量,具体分析了加装采风口增强通风管路堤降温效果的影响因素。分析表明,加装采风口后通风管路堤的冬季降温效果显著增强;当采风口安装在竖向通风管顶端时,通风管路堤冬季降温效果随着竖向通风管高度的增加而增加。对流换热是通风管路堤通过通风管与外界空气发生热交换的重要形式,从通风管对流换热的角度考虑,采风口安装高度越高越好,但由于车辆运行会扰动路堤两侧附近的风场,采风口的安装高度最高应不超过路堤高度。更多还原

【Abstract】 For the duct-ventilated highway embankments in permafrost regions of the Qinghai-Tibet Plateau,the cooling capability of duct-ventilated embankment enhanced by a self-windward vent is focused.Based on the intake-air volume in the ventilation pipe,the factors influencing the cooling capability in duct-ventilated embankment enhanced by a self-windward vent are analyzed.The analysis results indicate that the enhancement of the cooling capability in the duct-ventilated embankment with a self-windward vent is significant during winter months.For the self-windward vent equipped on the top of the vertical pipe,the cooling capability during winter months in the embankment increases with the increase of vertical pipe height.Convective heat transfer is a dominant mode of heat exchange between the ventilation pipe wall and the ambient air in the duct-ventilated embankment.From a convective heat transfer point of view,the height of self-windward vent installed ought to be as high as possible.However,due to disturbance of the wind field near both sides of the duct-ventilated highway embankment caused by the running vehicles,the height of self-windward vent shouldn’t exceed the embankment height.更多还原