Abstract
Transient simulation of heat transfers for vehicle exhaust system plays an important role in vehicle development process. A vehicle thermal management system model, which includes the underhood, the exhaust system and uderbody, was established. In this model, the complicated boundary conditions between fluid and solid, which need to be specified in the non-coupled models, are now part of the solution and do not need to be specified. A transient simulation was undertaken for the heat transfer characteristics of this vehicle exhaust system. The heat transfer characteristics with the periodic pulsating movement of the exhaust gas velocity and temperature were obtained and analyzed, and the transient mean value were compared with the steady results, and the discipline between the steady heat transfer characteristics and the periodic pulsating movement of the exhaust gas velocity and temperature were found.
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