Abstract
In order to reduce the pressure loss and to improve the flow uniformity simultaneously under the condition of a limited diffuser length of the automobile catalytic converter or the automobile diesel filter, the authors have proposed a flow deflector placed inside the diffuser part (Hirata et al., 2006 & 2008). And, the authors have succeeded in both of the pressure-loss reduction and the flow-uniformity improvement. However, such past studies do not show whether the flow deflectors are effective in actual exhaust systems. So, in the present study, the autors try to reveal more practical performance of such a flow deflector, concerning the actual exhaust-gas flow from two types of gasoline engines. As a result, a multi-cylinder engine shows better performance than a single-cylinder engine.
