Optimization Design And Numerical Simulation On The New Type Of Automotive Three Way Catalytic Device

Three way catalytic converter is the necessary of automobile, it will make the exhaust emitted by the car to become harmless,and it greatly reduce exhaust pollution. The air flow characteristics is the key to design automotive three way catalytic device, including the flow uniformity and the pressure loss. Based on the study of the traditional type of three way catalytic converter,this paper has designed a new type of three way catalytic converter that is the radial catalytic method, and through the numerical simulation to optimize analysis. Finally, it was verified and contrast analysis by the pressure lose experimental.Through the research of two kinds of catalytic converter found that:1)The amount of vortex of the traditional three way catalytic converter increased with the increase of expansion angle and contraction angle,the air flow characteristics became worse.2)The new type of three way catalytic converter’ air characteristics became better first and then became worse with the increase of expansion angle and contraction angle because of the diversion.3)When the draft tube length is too long or too short and the by-pass hole diameter is big or too small, the velocity gradient inside would be increased, the air flow characteristics would become worse.4)When the new type of three way catalytic converter’ expansion angle, contraction angle is 35°,the diversion angle is 55°,the draft tube length is 20 mm and the by-pass hole diameter is 6mm,no matter the flow uniformity or the pressure loss is best.5)The experimental results and numerical simulation results of the new type of catalytic converter is about the same, the relative error is 11.88%.6)The new type of three way catalytic converter’ flow uniformity is more 0.293 than the traditional three way catalytic converter and the pressure loss is less 17.97%.The new type of Three way catalytic’ air flow characteristics is better than traditional type of three way catalytic converter, its airflow uniformity is better and the pressure lose is smaller, it is conducive to improve the catalytic efficiency.