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Analysis of Internal Flow Field and Vibration Characteristic of Vehicle Manifold Catalytic Converter

Author: LiMingYang
Tutor: DingBaiQun
School: Northeast Forestry University
Course: Vehicle Operation Engineering
Keywords: Manifold catalytic converter Flow characteristics Vibration characteristics Numerical Simulation
CLC: U464.13
Type: Master's thesis
Year: 2011
Downloads: 32
Quote: 0
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Abstract


The three way catalytic converter is used to control vehicle exhaust pollution outside the machine purification mainstream technology . With the equivalent of Euro Ⅲ, Euro Ⅳ emission limit standard country Ⅲ, Ⅳ emission standards for the implementation of the requirements of automotive cold start before the 40s exhaust components sampled monitoring and restrictions , which makes catalytic converters not only have a high conversion rate and long service life , and to have a more favorable combustion characteristics . Conventional forms of catalytic converters meet the standards under the chassis facing great difficulties . Manifold catalytic converter is the birth of a new structure in this case , the advantage of this structure is closer to the engine, quick ignition , give full play to the catalyst performance can be the catalyst , thus EURO Ⅲ emission standards for vehicles widely used. The paper establishes a three-dimensional model of the manifold catalytic converter FLUENT software analog converter in the case of steady-state and no chemical reaction within the as flow changes converters internal airflow speed field, pressure field and temperature field the distribution state . Comparative Analysis of stamping half shell and tube sheet composite velocity distribution the two manifold catalytic converter with the conventional form of catalytic converters in the windward position before the catalyst . Finally, the analysis results with engine performance test results of the comparative analysis . Similarly , the vibration characteristics plays a vital role in the reliability and life of the manifold catalytic converter change makes the difference and work location of the structure in the form of the manifold type converters vibration characteristics different from those of other forms of converter , thesis to analyze the vibration characteristics of the new structure of the catalytic converter . Studies show that the entrance flow rate is increased so that the model significantly increased pressure loss ; catalytic converter internal airflow axial flow velocity increases , and the uniformity of the radial distribution of the catalyst front end face airflow reduced ; manifold-type catalytic converter with respect to the conversion of conventional form more uniform air distribution . Modal analysis calculated the converter first five order natural frequencies, mode shapes , and the stress distribution in the entire structure of the modal value corresponding shift toward lower frequency as the temperature rises .

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive engine > Reciprocating engine > Components, parts
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