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標題: 單缸機車引擎進氣道與排氣系統穩態流場數值模擬與觸媒流場特性
The Analysis of the Steady Flow in the Intake Port and Exhaust Pipe for Single Cylinder engine and Flow Characteristics of Catalysts
作者: 廖偉成
chen, Liao wei
關鍵字: CFD
出版社: 機械工程學系
本文利用商業計算體力學CFD軟體FLUENT計算單缸機車引擎的排氣管及進氣道流場,進氣道計算是模擬引擎在Flow Bench的測試,研究方法是直接使用引擎設計時的CAD檔案進行分析,主要是針對檔案轉換與非結構性網格的建立進行研究,最後將計算出的流量與流量係數與實驗值作比較,結果發現非結構性網格在進氣閥開度小的時候預測相當準確,進氣閥開度大的時候則高估了8.9%。

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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