Abstract:

Because of the large size of the new type accelerated loading system, the accurate simulation of air temperature, road temperature and roadbed temperature are the key points and also difficult points for designing the system.By using the software Fluent, this paper simulated the running conditions of the everfrost simulation system and obtained the following results.When the thermally conductive surface had become a flat surface, under the condition of the thickness of the pipe layer was 30 cm, the largest pipe pitch was 40 cm, the position of the thermally conductive surface was independent of the roadbed materials.When the conditions of temperature and speed of cold wind, the temperature and the speed of secondary refrigerant and the diameter of the pipes were all fixed values, the optimal tube pitch was 25 cm, which was independent of the roadbed materials.When the conditions of temperature and speed of cold wind, the temperature and the speed of secondary refrigerant and the diameter of the pipes were all fixed values, when the temperature inside the roadbed had reached the requirement, the total energy cost was independent of the pipe pitches but was relevant to the roadbed materials.

摘要：

由于新型足尺加速加载试验系统的规模较大，对空气温度、路面温度和路基温度的精确控制是环境模拟控制系统的设计难点。本文利用Fluent软件，对新型足尺加速加载试验系统的子系统——多年冻土模拟系统进行了数值模拟计算。结果表明，制冷管排上方形成平板导热时，在制冷管层厚度为30 cm的情况下，允许管间距的最大值为40 cm，形成平板导热时的平板与制冷管的距离与路基材料无关。路面冷风温度、风速，载冷剂温度，流速，制冷管径确定时，最优管间距为25 cm，且与路基材料无关。当路面冷风温度、风速，载冷剂温度，流速确定，路基内温度达标时，总制冷量与制冷管间距基本无关，而与路基材料有关。