| 研究生: |
歐祥程 Ou, Hsiang-cheng |
|---|---|
| 論文名稱: |
數值模擬應用於均質進氣柴油引擎之排氣汙染研究 Study of Numerical Simulation on The Exhaust Emission of Homogeneous Charge Diesel Engine |
| 指導教授: |
吳鴻文
Wu, Horng-wen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 系統及船舶機電工程學系 Department of Systems and Naval Mechatronic Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 102 |
| 中文關鍵詞: | 排氣污染 、數值模擬 、密閉式循環柴油引擎 、均質壓燃式引擎 |
| 外文關鍵詞: | numerical simulation, homogeneous charge compression ignition, exhaust pollution, close cycle diesel engine (CCDE) |
| 相關次數: | 點閱:102 下載:4 |
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均質壓燃式引擎(HCCI)可降低柴油引擎的污染物生成,因均質壓燃式引擎需採用進氣過程時形成的均質混合氣,所以進行不同預混合比之燃氣對均質壓燃式引擎的汙染物分析是非常重要的。
本文針對KUBOTA RK-125 型之單缸直噴式柴油引擎進行數值模擬,以KIVA3V-RELEASE2為程式主體,藉由修改程式的汙染計算模式,進行數值運算。分析在不同引擎轉速及不同比例的預混合燃氣下,引擎所產生的汙染物,包含氮氧化物、二氧化碳、一氧化碳、碳煙濃度及碳煙平均顆粒大小,並將模擬的結果與實驗及文獻比較。
本研究已成功地完成導入各種預混合氣(甲醇、乙醇和汽油)的HCCI引擎污染物模擬分析。模擬結果顯示,使用醇類預混合氣的HCCI引擎對於污染物的降低確實優於使用汽油及一般柴油引擎,且以氮氧化物及碳煙造成的效果最顯著,且隨著比例的增加將會使燃燒更完全,因而不易產生碳煙及氮氧化物;但需注意若比例過高有可能影響引擎性能或其他污染物的生成量。未來期望本研究的燃燒性能模擬對HCCI引擎安裝在密閉式循環柴油引擎系統 (CCDE系統採用HCCI引擎)時有參考的價值。
The homogeneous charge compression ignition (HCCI) engine can reduce the formulation of pollutant. Because the homogeneous charge compression ignition needs to adopt the formation of homogeneous mixture gas in the intake process, it is very important to analyze the combustion performance of a homogeneous charge compression ignition engine with different intake premixed gases and their contents.
This article is aimed at the KUBOTA RK-125 which is a single cylinder direct injection diesel engine, and carries out the numerical simulation. KIVA3V-RELEASE2 is used as the subject of the program, according to modifying the models of the pollution. The emissions including nitrogen oxides (NOx), carbon dioxide(CO2), carbon monoxide(CO), soot concentration and soot average particle diameter, in homogeneous charge compression ignition engine are calculated under different proportions of intake gas and different engine speeds, and the results between the simulation and the experiment will be compared .
The research has already incorporated the premixed gas (gasoline, ethanol and methanol) simulation successfully in the HCCI engine of exhaust emission. The simulation results show that premixed gas of alcohol is better than gasoline and a diesel engine in decreasing exhaust emissions, and the result is conspicuous for the reduction of NOx and Soot emission. For the premixed gas, both NOx and soot can be reduced by the increase of premixed ratio simultaneously, but to affecting other emission and engine performance may exist as the proportion is too high. The simulation combustion process in this research is expected to be a reference value when the CCDE system installs with HCCI engine in the future.
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