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Study on Flow Field Analysis and Structure Optimization of Exhaust Manifold Catalytic Converter

Author: SunLuQing
Tutor: AnWei
School: Jiangnan University
Course: Mechanical and Electronic Engineering
Keywords: Manifold-type catalytic converter Flow characteristics Structural improvements Numerical Simulation
CLC: U464.13
Type: Master's thesis
Year: 2009
Downloads: 112
Quote: 2
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Abstract


Currently, the three-way catalytic conversion of motor vehicles to control vehicle emissions pollution mainstream technology, the catalytic converter is a key supporting device in the exhaust system of the vehicle. With emissions regulations becoming more stringent, increasing its performance requirements, structural design and more complex structure for the performance of the catalytic converter has become increasingly evident, has been unable to meet the requirements of the traditional design ideas. The subject of study is in this context, leading enterprises rely on domestic production of catalytic converters - Weifu Lida the catalytic purifier limited liability company, to carry out the use of advanced simulation technology analysis catalytic converter internal flow characteristics and guidance products the structural design. In this paper, a full analysis on the basis of the current status of motor vehicle emission control at home and abroad and post-processing technology, combined with the actual product development, following research: (1) study the flow characteristics of the catalytic converter, the fluid motion The control equation reasonably simplified model to establish a mathematical model and parameters for a specific problem, and provides a theoretical support for the the CFD software application reliability. Simulation results show that: the process converges accurate. (2) by the steady flow field analysis of the conventional three-way catalytic converter and 0-20s transient transformation effect analysis to identify the main factors affecting the flow characteristics; accumulated boundary conditions and parameters applicable to the catalytic converter set, test results show that: the the established simulation analysis method has a high reliability and universality. The analytical method has been applied in Brilliance 2.0T engine catalytic converter instance, through the three structural improvements proposed program, the successful resolution of the 12-hour endurance test vectors shedding problem due to the structure caused by an irrational GB. (3) the use of the the latest 1D-3D coupled technology Fukuda 486 manifold catalytic converter flow simulation, analysis manifold catalytic converter on the entire engine intake and exhaust systems. Optimized according to the analysis results and the design requirements of the original model, and verified by experiments carried out in the engine test bench, the results showed that: The optimized model can greatly improve the flow characteristics of the gas, to improve the efficiency of the catalytic conversion, shorten the combustion time also improve the performance of the engine. The research results obtained in the actual production of the successful application, provide the basis and direction for the design and improvement of the manifold catalytic converter also can provide a reference for the research and development of other similar products.

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