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題 名 | 進氣道角度對內燃機引擎汽缸內流場影響之研究=A Study on the Impact of Angles of Intake Port on the Flow Field of an Internal Combustion Engine |
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作 者 | 舒小恩; 鄧治東; 林春宏; 鄭明宏; 楊松林; | 書刊名 | 中原學報 |
卷 期 | 29:1 2001.03[民90.03] |
頁 次 | 頁49-62 |
分類號 | 446.41 |
關鍵詞 | 流場; 進氣道角度; 內燃機引擎; KIVA 3-V程式; Flow field; Intake port angles; Internal combustion engine; KIVA-3V code; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究採用KIVA-3V計算流體力學程式針對一實際引擎以模擬其不同進氣道角度,對其產生在汽缸內的流場加以分析、比較;研究中所採用的紊流模式為紊流強度較強之Renorrna1ization Group (RNG)k-ε紊流模式。結果顯示,改變進排氣閥的傾斜角度對進氣 期間的流場變化有很明顯的影響,其中以垂直閥(進排氣閥傾斜0度)所得的Y軸向(y方向係垂直於將汽缸對分為二平面的方向)滾流強度、渦漩比、紊流強度、紊流動能等流場強度為最強;此外流體經活塞壓縮後的流場特性顯示壓縮衝程對汽缸內流場的效應亦是不容忽視的;因此由進氣到壓縮過程結束的整體流場現象,才是影響引擎點火前的油氣混合程度與燃燒品質的關鍵。 |
英文摘要 | This study used KIVA-3V CFD methodology to ana lyze the flow field occurring in an engine-with varying angles of the intake port. The turbulence model used is the Renormalization Group (RNG) K-ê turbulence model that provides a relatively higher turbulence than the standard K-ê turbulence model. The results of this study indicate that changing the angle of the intake port has a profound effect on the flow field during the intake stroke of the engine cycle. For the case with the intake-exhaust va1ves canted at zero degree (the so-ca11ed vertica1 va1ves), the tumble ratio, swirl ratio, turbulent intensity, and turbulent kinetic energy in the direction perpendicular to the bisecting plane of the cylinder are at their highest levels the those obtained for the other cases. This effect is most pronounced after the compression stroke of the cycle. As aresult of this study, it is observed that the behavior of the overa11 flow field from the intake to the completion of comProssion stroke has a major impact on the effectiveness of the mixing of fuel-air prior to the ignition of the engine cycle. |
本系統中英文摘要資訊取自各篇刊載內容。