NOVEL DESIGN OF GAS CENTRIFUGE FOR SUB-MICRON PARTICLES SEPARATION FROM DIESEL ENGINE EXHAUST FUMES

摘要

Motor vehicles are responsible for approximately 40% of the Europe's total suspended particulate emissions, predominantly composed of graphite carbon. The diesel vehicles manage to contribute 90% of the total particulates. It is apparent that the compact and unexpensive clean-up systems are required to separate well into sub-micron (up to 0.1 microns) particle level. A design of a novel device for removing sub-micron particles from a diesel engine exhaust gas stream has been developed in Cardiff School of Engineering. The prototype centrifuge was designed with an emphesis on the separation and cleaning of a diesel engine particulate emissions from diesel engine exhaust. Therefore this model was geared up for more specific problem of diesel engine clean-up, rather than the more general field of sub-micron particle separation and classification. In order to obtain optimum design of the rotational tube the CFD package FLUENT has been used. The package was employed for modelling both aero- and particle dynamics and uses various turbulent models for flow predictions.