Thermal management analysis of engine cabin based on 1-D and 3-D coupled simulation 2019-01-0896
Currently 1-D and 3-D simulation are two main simulation methods of thermal management system of engine cabin. 1-D simulation is mainly used in the initial stage of the automobile development. Without the insufficient specific parameters, the relative accurate result can be obtained by 1-D simulation, which provides basic data for the next thermal management development. The 3-D simulation provides a flow field distribution inside the engine cabin that provides precise guidance of local temperature field control. This paper describes an analysis process for 1-D and 3-D coupled simulation. One-dimensional simulation provides boundary conditions for 3-D simulation, and the resulting 3D simulation results correct the 1-D simulation results to make the simulation more accurate. In 3-D simulation, the cold airflow field and thermal airflow field simulation in different working conditions of the engine cabin were done by CFD analysis. The results showed that there was reflux around intercooler and condenser, and the maximum pressurized air intake temperature in intercooler was 134℃ over than the target value 130℃. In 1-D simulation, the 1-D thermal balance model of the cooling system of engine cabin was established. The system resistance and pressure drop in 1-D model was corrected by the results given by 3-D CFD analysis. The results showed that all the maximum coolant temperature in both inlet and outlet of water tank were less than the designed SPEC value 113℃ in different working conditions. Compared with experiment data, the maximum simulation tolerance is 5.3％, so the simulation results were considered to be accurate and reliable.