نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The monolithic catalytic converter is still the main pollution control device for modern vehicles in order to reach
the ever-increasing legislative demands for low emission standards. The catalytic converters require a large expansion
from the exhaust pipe to the front face of the monolith. Unfortunately, packaging constraints often do not
permit the use of long diffusers. Hence, flow separation within the diffuser leads to a non-uniform flow distribution
across the monolith. A uniform flow distribution at the inlet monolith face is favorable for the conversion efficiency
as well as the durability of the catalytic converter. Therefore, the main problem is to optimize the flow distribution
at the catalytic converter. It should be noted that due to flow maldistribution in an enlarged inlet of catalytic converter,
some parts of the monolith would be non effective. In this research, a new design for inlet diffuser of catalytic
converter has been proposed and fabricated. The new inlet diffuser is composed of some tube to tube cones
that distribute the flow uniformly at the entrance face of monolith. Temperature, pressure drop, and concentration
of pollutants, before and after the catalyst, have been measured. The results show that the new design for inlet diffuser
tends to a less uniform temperature field at the entrance of monolith but the flow distribution becomes more
uniform. Therefore, an increased conversion efficiency of the catalyst will be obtained.
کلیدواژهها [English]
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