Mechanism Investigations of Fluid-Solid Conjugate Heat Transfers for Vehicle Exhaust System

Abstract

A conjugate heat transfer study was undertaken using STAR-CD. The boundary conditions are given by vehicle operation and engine operation. All three mechanisms of heat transfer, i.e., convection, conduction, and radiation, were included in the analysis. The vehicle exhaust system components temperatures were analysized at certain several separate variables such as the velocity and temperature of the exhaust gases which depend on the engine operation conditions and the velocity and temperature of the external airflows which depend on vehicle operations. The results showed all three mechanisms of heat transfer and increased quantitative understanding of the flow conditions surrounding vehicle exhaust system.

Predicting unsteady heat transfer effect of vehicle thermal management system using steady velocity equivalent method

“…In fact, in addition to working energy, about 70% of the engine energy needs to be protected by an effective thermal management system to achieve energy saving, and to improve the thermal comfort requirements of passengers. 1,[11][12][13] The high temperature of engine exhaust will affect the exhaust system components and their surrounding environment by heat dissipation. When the parts are too close to the high temperature exhaust system, these components will overheat.…”

“…In fact, in addition to working energy, about 70% of the engine energy needs to be protected by an effective thermal management system to achieve energy saving, and to improve the thermal comfort requirements of passengers. 1 , 11 – 13 …”