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The Analysis of the Steady Flow in the Intake Port and Exhaust Pipe for Single Cylinder engine and Flow Characteristics of Catalysts
chen, Liao wei
The computational fluid dynamics (CFD) was used in this study to investigate the flow characteristics in the engine inlet and exhaust system. The inlet flow was a steady flow simulating the flow bench test measuring the flow coefficient of inlet valve. A commercial software package FLUENT was used in this study.
In the inlet flow study, the CAD file of the engine was transformed to IGES and STL formulation, and IGES and STL file was imported into FLUENT to generate unstructured mesh. In order to build up unstructured mesh, the transformation of CAD file was the topic in this study. It was found results of unstructured mesh close to measured data at low valve lift. However, at high vale lift, the deviation was 8.9%.
A real exhaust system model was used in this study. The component of exhaust pipe was sat dividedly. It was convenient to change position or size of exhaust component. The computing result showed that the distribution of pressure in the exhaustion chamber was uniform.
A long tube was assumed to simulate the pipe in the platinum catalyst. The kinetics of carbon monoxide and propylene oxidation were discussed in this study. The five parameters were took into consideration. The computing result showed that wall temperature and pipe diameter was the most influential parameters.
|Appears in Collections:||機械工程學系所|
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