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題名 | The Effect of Intake Manifolds on Cylinder-to-Cylinder Variations of Performance and Emissions of a Four-Cylinder Engine=進氣歧管對四缸汽油引擎之氣缸間性能及排氣污染差異的影響 |
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作者姓名(中文) | 楊鏡堂; 鄭明宏; 蔡國隆; | 書刊名 | 中國工程學刊 |
卷期 | 14:1 1991.01[民80.01] |
頁次 | 頁21-28 |
分類號 | 447.1111 |
關鍵詞 | 引擎; 四缸汽油; 污染; 性能; 氣缸; 排氣; 進氣歧管; |
語文 | 英文(English) |
中文摘要 | 本文主要探討進氣管長度及管徑,對多缸引擎缸與缸間之容積效率、NO、CO排氣 污染及其它引擎性能差異之影響。 從本文之研究得知,由於水錘效應的影響,匹配長進氣管之汽缸其容積效率大於匹配短進氣 管者,此現象在高轉速時尤其明顯。減少進氣管管徑與增加進氣管長度有類似的效應,但在 高轉速時油汽混合物之慣性將被管壁強烈之摩擦力降低。 在低轉速時, NO 的濃度受汽缸壓力的影響較大,造成其濃度與進氣歧管長度及進氣歧管截 面積呈反比。 但高轉速時,NO 的濃度變化趨勢則正好相反。影響 CO 最主要的因素是燃料 的油氣比,改變歧管的長度或管徑對 CO 度的影響不大。 |
英文摘要 | This paper deals with the influences of unequal length and unequal diameter of intake pipes on the cylinder-to-cylinder variation of volumetric efficiency, NO emission, CO emission, and other typical simulation results of engine performance. It is found from the present study that, due to the water-hammer effect, the cylinder with the longer intake pipe has a higher volumetric efficiency than that with the shorter pipe. The phenomenon is especially evident at high engine speed. In addition, the decrease of the intake pipe diameter has an effect which is similar to that of the increase of the intake pipe length, but the inertia of the inlet mixture is reduced by the pipe wall friction at high engine speed. Shortening the intake pipe length of one of the cylinders has an effect on the engine performance and emissions which is similar to the effect of increasing the intake pipe length of the other cylinder. At low rpm, NO emission is inversely proportional to the volumetric efficiency because of the interaction of cylinder pressure. At high rpm, instead of the cylinder pressure, the cylinder temperature becomes the dominate factor and causes a drastic drop in NO. The cylinder-to-cylinder variation of CO emission with respect to the intake system dimensions is not significant. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。