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Study on the Overall Performance of Exhaust Catalytic Silencers

Author: WenZhiYong
Tutor: JiZhenLin
School: Harbin Engineering University
Course: Environmental Engineering
Keywords: Diesel engine Exhaust purification muffler Acoustic performance Resistance loss Purifying effect
CLC: TK423
Type: Master's thesis
Year: 2008
Downloads: 165
Quote: 5
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Abstract


Reduce engine noise and harmful emissions is an important research topic in today's world . Purification of exhaust gas muffler not only to achieve diesel engine exhaust gas purification exhaust noise control dual function , but also to save space, which has a broad application prospects . The diesel exhaust purification the silencer acoustic performance , flow field , the resistance loss and purification system . Based on the theory of sound propagation in the viscous flow , the establishment the tiny pore structure and catalytic transfer matrix of the carrier and then to calculate the acoustic properties of the catalyst carrier . According to the structure of the catalytic converter , it is divided into two parts : connecting the cavity and catalytic carrier , using the finite element method and the transfer matrix method to establish the mathematical model of the two parts , by the continuity conditions are coupled together , thereby calculating the transmission loss of the entire catalytic converter . The catalytic carrier transmission loss calculation results with the experimental results compared to verify the correctness of the proposed method . The catalyst carrier as a porous medium , to create a current model of the catalytic converter . Using computational fluid dynamics software to simulate the flow field distribution and pressure loss calculation catalytic converter carrier parameters , flow rate , inlet cone angle and other factors on the catalytic converter flow field distribution , optimal design for the structure of the catalytic converter provide a reference . Various chemical reaction mechanism of the catalytic converter and control equations together to build a mathematical model of the catalytic converter , the oxidation catalytic converter carrier single-hole channel model and the overall model , the use of CFD software and from the perspective of chemical reaction kinetics , obtained swords the deleterious component conversion versus temperature variation as well as harmful components within the bore of the mass distribution, to provide a reference for the catalytic active component coating . Designed a diesel engine exhaust to purification muffler and acoustic properties , resistance loss and purification of the simulation analysis , imports , internal connecting tube and the diversion on the purification of the overall performance of the muffler .

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CLC: > Industrial Technology > Energy and Power Engineering > Internal combustion engine > Diesel engine > Structure
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