A numerical study of flow field in the cylinder by using control valve in the runner

• Main Authors: Min-Chieh Chuang, 莊敏傑
• Other Authors: Jyh-Tong Teng
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/23475951581357034846

碩士 === 中原大學 === 機械工程研究所 === 92 === Abstract As a result of the demands for the operational capabilities and for the enhancement of the environmental quality, much improvement on the effectiveness of an engine and its pollution reduction has been requested. Since the behavior of the flow field inside an engine will directly impact its performance and emission of exhaust gases, the <a href="http://www.ntsearch.com/search.php?q=design&v=56">design</a> of an engine thus focuses on the study of its thermo-fluidic phenomena, with the goals of low emission of pollutants and high performance for the engine. This study used the methodology on computational fluid dynamics (CFD) – KIVA-3V <a href="http://www.ntsearch.com/search.php?q=software&v=56">software</a> package, based on control-volume algorithm – to evaluate the <a href="http://www.ntsearch.com/search.php?q=design&v=56">design</a> of a control valve in the intake port of an engine. By analyzing the flow field inside the cylinder of an engine, impacts of the engine rotational speeds and the openings of control valve on the behavior of the thermo-fluidic phenomena can be obtained. The results obtained from this study indicated that having a control valve in the intake port of an engine is highly effective for the in-cylinder flow field. As the blocking area of the control valve is increased, the intensities of the flow parameters, such as the flow swirl and tumble, are enhanced. In addition, as the rotational speed of the engine is increased, the performance of the engine, in terms of its kinetic <a href="http://www.ntsearch.com/search.php?q=energy&v=56">energy</a> and turbulent kinetic <a href="http://www.ntsearch.com/search.php?q=energy&v=56">energy</a>, is improved.