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| 研究生： |
蘇仁政 Su, Jen-Cheng |
|---|---|
| 論文名稱： |
高效率柴油引擎燃燒模擬與分析 High Efficiency Diesel Engine Combustion Simulation and Analysis |
| 指導教授： |
邱輝煌
Chiu, Huei-Huang |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
| 論文出版年： | 2002 |
| 畢業學年度： | 90 |
| 語文別： | 中文 |
| 論文頁數： | 78 |
| 中文關鍵詞： | 柴油引擎 、噴霧燃燒 |
| 外文關鍵詞： | spray combustion, diesel engine |
| 相關次數： | 點閱：75 下載：8 |
| 分享至: |
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柴油引擎因具優良熱效率及低污染排放，有鑑於此，本文針對此進行研究探討，採用KIVA3V（第二版）程式對於柴油引擎燃燒狀態進行模擬與探討，程式中已改進多項物理機制，包括：低溫化學反應機制之殼點火模式、初始破裂及空氣動力破裂機構之KH-RT噴霧破裂模式、油滴點火模式以界定油滴狀態及油滴群相互影響之氣化率與阻力之模組。此數值程式分別對汽缸壓力及熱釋放率作計算分析，並與實驗值相互比對驗證其可行性，並對點火延遲時間之預測，結果顯示程式具備相當準確之模擬能力。
本文針對直噴式柴油引擎進行數值模擬，藉由調整噴油時機、噴油注入燃燒室夾角、油滴尺寸變化來控制油滴群變遷，再加上不同引擎轉速之控制參數，以檢視不同參數下對燃燒室內部影響，並建立一設計分析準則，以提供引擎設計研發作為有效之重要參考依據。在結果比較上，發現到氮化物生成與燃燒室溫度有密切關連，並發現到油滴尺寸及噴油時機將對點火時機將造成顯著影響，當點火延遲時間越長，則初期熱釋放峰值越高。
Diesel engine has many advantages including high efficiency and low polluted formation. For these reasons, the present study aims to simulate the combustion chamber of the diesel engine using KIVA3V (Rel.2) code which has been updated with the physical models including the Shell ignition model, the KH-RT spray breakup model, droplet ignition criteria, and renormalize droplet laws. The numerical simulation of this code has been performed to validate its applicable feasibility for predicting of cylinder pressure distribution and heat release rate in comparison with experimental data in the combustion chamber of Caterpillar DI diesel engine.
The objective of the thesis is to develop an analytic design criterion studied the effect about the engine rpm, droplet size, injection timings, spray nozzle cone angle and the tilt angle between spray nozzle axis and combustion chamber. The results indicate that the predicted flow structures have an important impact on the prediction of NOx formation since it is very sensitive to local temperature in the combustion chamber. And the droplet ignition timing is affected upon the droplet size and the injection timing. On the other hand, the initial peak heat release value is subjected to the droplet ignition delay.
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校內：立即公開校外：2002-06-18公開