Study On Car Body Heat Insulation Performance And Comfort In Compartment Of High-speed Train

With the continuous improvement of people’s living standards, the demand for means of transportation is highly increased. It is necessary to ensure the safe operation and create a comfortable riding environment for both passengers and staff in the high-speed train. The insulation performance for car body of the high-speed train is related to the air-conditioning cold and heat load size. The distribution of flow field in the passenger compartment has an influence on the ride comfort of passengers. It is necessary to study the heat insulation performance and the distribution of flow field in the passenger compartment for the air-conditioned train.Several models of high-speed trains were established by using the CFD software FLUENT and finite analysis software ANSYS Workbench. With those models, the heat transfer coefficient K of high-speed train is obtained. The flow field distribution and temperature field in the second-class seat coach, sleeper coach compartment were studied respectively. The principal conclusions as follows:1. The contribution of the roof and floor to the total heat transfer is relatively large, since the structure of the roof and floor is complex, and the insulation effect is worse than the side wall.2. Although the size of the side door, end door and windows in the entire body is a relatively small, the heat transfer coefficient K is relatively large. Therefore, to reduce the heat transfer of the train, the side door, end door and windows should be paid much attention to the main heat transfer way.3. In the second-class seat coach, the flow is relatively stable, the velocity field and the temperature field distribution is relatively uniform.4. In the sleeper coach, the flow field in the passenger compartment is stable. The flow distribution in the corridor and rooms is not uniform.The velocity in the first terminal part of the corridor is relatively large. In the rooms, the velocity of the position which is perpendicular to the air supply hole is relatively large.5. In the sleeper coach, the indoor temperature distribution is relatively uniform. The difference in temperature between the room and aisle is less than 5℃.