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研究生:廖文彬
研究生(外文):Wun-Bin Liao
論文名稱:HCCI柴油引擎歧管煤油輔助噴射下之引擎性能與熱釋放分析研究
論文名稱(外文):The Performance and Heat Release Analysis of the HCCI Diesel Engine with Intake Manifold Kerosene Assistant Injection
指導教授:施國亮施國亮引用關係
指導教授(外文):Kuo-Liang Shih
口試委員:王覺寬盧昭暉
口試委員(外文):Muh-Rong WangJau-Haui Lu
口試日期:2014-07-28
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:71
中文關鍵詞:HCCI共軌柴油引擎煤油輔助噴射引擎汙染排放熱釋放CI引擎點火延遲
外文關鍵詞:HCCICommon-railassistant injectionengine emissionsCI engineignition delay
相關次數:
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本研究主要以改裝共軌後柴油引擎,利用兩階段噴射與等熱值方式,由歧管預先噴入煤油,以達到與空氣均質混合,並改變兩階段不同比例,探討不同燃料混合燃燒特性與熱釋放燃燒相位變化,對於引擎性能和污染排放等相關影響。探討對象為CY190 1000C.C.單缸直噴式柴油引擎為實驗載具,其中引擎操作噴油壓力為600bar,並固定柴油的當量比(Φd=0.2、0.3、0.4、0.5),以三個不同轉速(rpm=1500、1800、2100)下來進行之實驗探討。

本研究共分為三部分,第一部分為未預噴煤油,噴油正時固定為壓縮上死點前19°CA,改變不同轉速與當量比,測試出缸內直噴柴油引擎之基本性能與污染排放,將數據記錄下來與後續部分作比較。第二部分將探討歧管預噴入不同取代比例(20%、50%、80%,文中以Fk=20、Fk=50、Fk=80表示)之煤油對引擎性能與污染排放之影響,其中煤油之噴油正時,在進氣上死點後10°CA的效果最佳,故本研究將煤油噴射正時固定於進氣上死點後10°CA。第三部分將前兩部分所得之結果對照分析,探討兩階段預噴煤油對引擎性能與污染排放之影響。

本研究結果發現二階段預噴煤油下,對於引擎高轉速高負荷時,扭力輸出有些微上升,因為煤油之閃火點較柴油低,且在歧管於進氣行程時預噴產生預混情形,在燃燒前有充足的時間與缸內空氣均勻混合,使汽缸內產生一層薄薄的油氣,改善了傳統柴油引擎的缺點,減少了柴油引擎點火延遲的現象,但是氣缸內邊界層的油氣無法完全燃燒,使污染排放物增加。實驗結果顯示,煤油噴霧後扭力有上升,且缸壓峰值隨著煤油噴入前移,熱釋放峰值越接近在上死點附近。噴入煤油後NOx的排放量有下降的趨勢,HC的排放量有上升的趨勢,而CO的排放量也有上升的趨勢,煤油噴入後Smoke的排放有些微改善下降。

由本研究結果可知燃油多段噴射,可使直噴柴油引擎更接近均質燃燒,優點可降低NOx 、Smoke汙染,提高些許扭力,且不同燃料混合燃燒,對柴油引擎性能提升是有所幫助的。

This research studies the modified one cylinder diesel engine with two stage-stage equal heating value duel fuel injection. The kerosene is injected inside the intake manifold whirl its proportion is varied to study this assistant kerosene injection on the engine performance. The CY190 1000c.c. single cylinder diesel engine has 600 bars injection pressure, the equivalence ratio is Φd=0.2, 0.3, 0.4, and 0.5, the engine speed is rpm=1500, 1800, 2100, and 2400.

The first part of this study, the baseline engine running without kerosene injection is done to record the basic engine performance and emissions. The second part has kerosene with Fk=20, 50, and 80 which indicates 20%, 50%, and 80% diesel is replaced by kerosene injection. The best kerosene fuel injection timing is 10 ATDC. The third part of this study compares the first two parts’ results to understand the two-stage fuel injection on engine performance.

Results indicate under high engine speed and load the engine torque is slightly increased. This is because the kerosene has lower flash point and the fuel is premixed in the intake manifold. The premixed kerosene-air charge inside the combustion chamber improves the traditional engine ignition delay so that the engine torque is increased. However, the fuel lean charge near the combustion wall causes unburned HC and CO increase. The peak cylinder pressure is move advanced to near the TDC and the heat release has the same results. The NOx has reduction trend while the HC and CO are both increased. However, the smoke is slightly improved.

This research has multi-stage injection which allows a semi-homogeneous charge combustion environment inside the combustion chamber. The advantage of this engine duel fuel injection is the NOx, and smoke are reduced, the engine torque is increased. The duel fuel combustion is approved for beter engine operation in this research.

中文摘要
ABSTRACT
誌謝
目錄
表目錄
圖目錄
符號說明
第一章 緒論
1-1前言
1-2研究動機
第二章 研究背景
2-1文獻回顧
2-2研究目的
第三章 研究設備與方法
3-1 實驗控制及量測設備
3-1-1引擎數據量測設備
3-1-2柴油引擎進氣與燃油系統
3-1-3等能量(等熱值)燃料噴射之計算
3-1-4 燃燒室壓力量測系統
3-1-5雙燃料噴射系統介紹
3-1-6 引擎廢氣排放濃度量測系統
3-2高壓共軌供油系統
3-2-1高壓油泵(High pressure pump)
3-2-2柴油共軌(Common rail)
3-2-3交流馬達(AC motor)
3-2-4噴油嘴(Unit injector)
3-3熱釋放
3-3-1 熱釋放計算公式
3-3-2 熱釋放率計算
3-4實驗步驟與研究方法
3-4-1直噴式柴油引擎基本性能及汙染之探討
3-4-2預噴煤油後對引擎性能及污染之影響
3-4-3預噴煤油與缸內直噴柴油比較扭力及污染之差異
第四章 研究結果與分析
4-1柴油對於柴油引擎性能及廢氣排放之探討
4-2歧管預噴不同取代量之煤油對柴油引擎性能及汙染之影響
4-2-1預噴煤油對NOx排放之影響
4-2-2預噴煤油對HC排放之影響
4-2-3預噴煤油對CO排放之影響
4-2-4預噴射煤油對Smoke排放之影響
4-2-5預噴煤油對柴油引擎扭力之影響
4-2-6預噴煤油對柴油引擎比燃油消耗率之影響
4-2-7預噴煤油對柴油引擎燃燒壓力之影響
4-2-8預噴煤油對柴油引擎燃燒熱釋放之影響
4-2-9預噴煤油對柴油引擎燃燒總熱釋放之影響
4-2-10預噴煤油對柴油引擎點火延遲之影響
第五章 結論與未來展望
5-1 結論
5-2建議與未來展望
參考文獻
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