Numerical simulation of temperature field of roadbed of full size accelerated loading system

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.