研究生: |
徐瑞甫 Jui-Fu Hsu |
---|---|
論文名稱: |
以CFD模擬缸內直噴汽油引擎在層狀燃燒模式下火星塞周圍動態油氣分佈狀況及其對引擎性能與油耗之影響 CFD Simulation of the Fuel Distribution Dynamics Around the Spark Plug and its Effects on the Performance and Emissions of a GDI Engine in Stratified Mode Combustion |
指導教授: |
姜嘉瑞
Chia-Jui Chiang 蘇裕軒 Yu-Hsuan Su |
口試委員: |
蘇裕軒
溫琮毅 |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2021 |
畢業學年度: | 109 |
語文別: | 中文 |
論文頁數: | 195 |
中文關鍵詞: | 預測 、燃油二階段噴射 、油氣分佈 |
外文關鍵詞: | predict, two-stage injection, fuel and air distribution |
相關次數: | 點閱:239 下載:5 |
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近年來由於環保法規的日趨嚴格,分層燃燒模式成為應對環保法規的一種內燃機控制技術,而分層燃燒中的油氣分佈狀態一直是研究的重點。由於引擎的轉速極快,汽缸內的燃油與空氣皆不易觀察,對分層燃燒的發展形成挑戰。因此,本研究使用CFD 方法對GDI 引擎進行數值模擬汽缸內動態油氣分佈,分析並預測油氣分佈對於引擎性能、汙染與油耗的影響。具體來說,油氣在不同的化學當量比下,會對燃燒行為產生不同的影響,透過燃油一階段噴射與燃油二階段噴射兩種不同的分層模式,對汽缸內油氣分佈對燃燒行為的影響進行分析,就能有效預測GDI 引擎在不同分層模式對於引擎性能、汙染與油耗的影響,再透過實驗結果的比對,確認預測方法的有效性。透過實驗結果證明,使用CFD 方法對汽缸內的動態油氣分佈進行分析,能有效預測分層燃燒下油氣分佈對於引擎性能、汙染與油耗的影響。比較燃油二階段噴射與燃油一階段噴射的實驗結果得知,燃油二階段噴射的引擎出力提升2.2%、BSFC 下降10.4%、CO 下降21.2%、NOx 下降10%,從以上結果證明, 燃油二階段噴射不只提升的引擎性能,並改善了污染與油耗。
In recent years, due to strict environmental protection regulations, the stratified combustionmode has become a kind of internal combustion engine control technology. The focus of research is fuel and air distribution in stratified combustion mode. Because the engine speed extremely fast, the fuel and air in the cylinder are not easy to observe, therefore, it poses a challenge to the development of stratified combustion mode. In this study, the CFD method has been used to simulate the dynamic fuel and air distribution in the cylinder of the GDI engine, analyze and predict the impact of fuel and air distribution on engine performance, pollution and fuel consumption. Specifically, fuel and air will have different effects on combustion
behavior under different stoichiometric ratios. Through two different stratification
modes, one-stage injection and two-stage injection, analyze the influence of fuel and air distribution in the cylinder on combustion behavior, it can effectively predict the impact of GDI engine on engine performance, pollution and fuel consumption. Then, by confirming the effectiveness of the prediction method by comparing the results of the experiment. The experimental results prove that the use of CFD method can effectively predict the impact of fuel and air distribution on engine performance, pollution and fuel consumption. With the engine test result, the two-stage fuel injection mode, comparing with onestage fuel injection mode, increase 2.2 % of power, BSFC decrease 10.4 %, CO decrease 21.2 %, NOx decrease 10 %, With the above benefits, we discover that the two-stage fuel injection mode increases power, reducing emissions and fuel consumption.
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