本文選題：缸內(nèi)直噴 + 甲醇發(fā)動機(jī)　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：隨著能源危機(jī)和環(huán)境危機(jī)日益加劇，尋求一種清潔的可替代燃料迫在眉睫。經(jīng)過多年的探索，人們開始將目光轉(zhuǎn)向了甲醇。甲醇,化學(xué)分子式為CH3OH，具有和汽油、柴油媲美的儲存運(yùn)輸和應(yīng)用方面的優(yōu)勢，同時(shí)在常規(guī)排放性能方面比傳統(tǒng)燃料更優(yōu)，所以甲醇被公認(rèn)為是21世紀(jì)最具發(fā)展?jié)摿Φ拇萌剂�。除了以上種種優(yōu)勢，甲醇燃料的應(yīng)用也面臨不少問題亟待解決，，特別是甲醇燃料帶來的非常規(guī)排放問題，嚴(yán)重制約了甲醇燃料的大規(guī)模應(yīng)用。 本文以一臺經(jīng)柴油機(jī)改裝的缸內(nèi)直噴點(diǎn)燃式甲醇發(fā)動機(jī)為原型，通過三維建模軟件Pro/E對模型進(jìn)行精簡優(yōu)化并將模型以*.stl格式導(dǎo)出，采用AVL-FIRE軟件對模型進(jìn)行前處理，使用AVL-FIRE軟件耦合甲醇詳細(xì)氧化機(jī)理進(jìn)行模擬計(jì)算，用仿真計(jì)算得到的缸壓曲線與實(shí)驗(yàn)所測的缸壓曲線進(jìn)行對比驗(yàn)證以確保仿真計(jì)算的準(zhǔn)確性。通過模擬計(jì)算研究進(jìn)氣溫度（過量空氣系數(shù)）、點(diǎn)火正時(shí)、噴油正時(shí)對冷啟動和穩(wěn)態(tài)工況非常規(guī)排放影響，得到以下結(jié)論： 一、冷啟動工況： 1.提高進(jìn)氣溫度能促進(jìn)甲醇霧化及蒸發(fā)，改善缸內(nèi)混合氣分布，提高缸內(nèi)混合氣燃燒質(zhì)量，有效降低未燃甲醇和甲醛排放；當(dāng)進(jìn)氣溫度從283K提高到313K未燃甲醇和甲醛的排放能夠得到極大改善；當(dāng)進(jìn)氣溫度達(dá)到313K繼續(xù)提高進(jìn)氣溫度對降低未燃甲醇和甲醛的排放效果不明顯。 2.推遲點(diǎn)火正時(shí)，缸內(nèi)混合氣分布惡化，燃燒惡化，未燃甲醇和甲醛排放升高；當(dāng)點(diǎn)正時(shí)由20°CA BTDC推遲到11°CA BTDC未燃甲醇和甲醛排放增加不明顯；當(dāng)點(diǎn)火正時(shí)由11°CA BTDC推遲到8°CABTDC時(shí)未燃甲醇和甲醛排放會急劇增加。 3.推遲噴油正時(shí)，缸內(nèi)混合氣分布得到優(yōu)化，燃燒更加充分，有效降低未燃甲醇和甲醛排放；當(dāng)噴油正時(shí)為57°CA BTDC時(shí)未燃甲醇和甲醛排放最高，隨著噴油正時(shí)推遲未燃甲醇和甲醛排放呈遞減趨勢；但是當(dāng)噴油正時(shí)為49°CA BTDC時(shí)由于缸內(nèi)燃燒溫度維持在1000K左右會促進(jìn)未燃甲醇不完全氧化成甲醛使得甲醛排放達(dá)到峰值，當(dāng)噴油正時(shí)進(jìn)一步推遲甲醛排放明顯下降。 二、穩(wěn)態(tài)工況： 1.增大過量空氣系數(shù)，不利于混合氣形成，燃燒惡化，未燃甲醇和甲醛排放增加；當(dāng)過量空氣系數(shù)由λ=1.5增加到λ=2.5未燃甲醇甲醛排放增加不明顯；當(dāng)過量空氣系數(shù)增加到λ=3.0未燃甲醇和甲醛排放急劇增加。 2.推遲點(diǎn)火正時(shí)，缸內(nèi)混合氣分布惡化，燃燒惡化，未燃甲醇和甲醛排放增加；當(dāng)點(diǎn)火正時(shí)由20°CA BTDC推遲到11°CA BTDC未燃甲醇和甲醛排放有輕微增加；當(dāng)點(diǎn)火正時(shí)推遲到8°CABTDC未燃甲醇和甲醛排放急劇增加。 3.推遲噴油正時(shí)，能有效改善缸內(nèi)混合氣分布，燃燒質(zhì)量提高，未燃甲醇和甲醛排放顯著降低；當(dāng)噴油正時(shí)為57°CA BTDC時(shí)未燃甲醇和甲醛排放十分高；當(dāng)噴油正時(shí)推遲到53°CA BTDC未燃甲醇和甲醛排放有顯著降低；當(dāng)噴油正時(shí)進(jìn)一步推遲未燃甲醇和甲醛排放降輕微降低。
[Abstract]:With the increasing of energy crisis and environmental crisis , it is urgent to seek a clean alternative fuel . After many years of exploration , people have begun to turn their attention to methanol . Methanol and chemical molecular formula CH3OH have the advantages of storage transportation and application as well as gasoline and diesel oil . At the same time , methanol is recognized as a substitute fuel with the most development potential in the 21st century . In addition to the above advantages , the application of methanol fuel has many problems to be solved , especially the problem of unconventional discharge caused by methanol fuel , which seriously restricts the large - scale application of methanol fuel .

In this paper , a diesel engine modified in - cylinder direct injection ignition methanol engine is used as a prototype , and the model is optimized by three - dimensional modeling software Pro / E and the model is derived in the form of * . stl . The simulation calculation is carried out on the model by using the software Pro / E . The cylinder pressure curve obtained by the simulation is compared with the cylinder pressure curve measured by the experiment to ensure the accuracy of the simulation calculation .

I . Cold start working condition :

1 , increasing the intake air temperature , promoting methanol atomization and evaporation , improving the distribution of the in - cylinder mixture , improving the combustion quality of the in - cylinder mixture , and effectively reducing unburned methanol and formaldehyde emission ;
When the inlet temperature is increased from 283K to 313K , the discharge of unburned methanol and formaldehyde can be greatly improved ;
When the intake air temperature reaches 313K , the effect of increasing the intake air temperature on reducing unburned methanol and formaldehyde is not obvious .

2 . When the ignition timing is retarded , the distribution of the in - cylinder mixture deteriorates , the combustion deteriorates , the unburned methanol and the formaldehyde emission increase ;
When the ignition timing was retarded from 20 擄 CA BTDC to 11 擄 CA BTDC unburned methanol and formaldehyde emission increased obviously ;
Unburned methanol and formaldehyde emissions increase sharply when the ignition timing is retarded from 11 擄 CA BTDC to 8 擄 CABTDC .

3 . When the fuel injection timing is delayed , the distribution of the in - cylinder mixture is optimized , the combustion is more fully , the unburned methanol and formaldehyde emission are effectively reduced ;
When the fuel injection timing was 57 擄 CA BTDC , unburned methanol and formaldehyde were the highest , and the emission of unburned methanol and formaldehyde was decreased with the fuel injection timing .
However , when the fuel injection timing is 49 擄 CA BTDC , the combustion temperature in the cylinder is maintained around 1000K to promote the incomplete oxidation of unburned methanol to formaldehyde so that the formaldehyde emission reaches the peak value , and the emission of formaldehyde is further delayed when the injection timing is positive .

II . Steady - state operating conditions :

1 . Increasing the excess air coefficient is not conducive to the formation of the mixed gas , the combustion deteriorates , the unburned methanol and the formaldehyde emission increase ;
When the excess air coefficient increases from 位 = 1.5 to 位 = 2.5 , the formaldehyde emission of unburned methanol is not obvious ;
When the excess air factor increases to 位 = 3.0 unburned methanol and formaldehyde emissions sharply increase .

2 . When the ignition timing is retarded , the distribution of the in - cylinder mixture deteriorates , combustion deteriorates , unburned methanol and formaldehyde emission increase ;
When the ignition timing was retarded from 20 擄 CA BTDC to 11 擄 CA BTDC unburned methanol and formaldehyde emissions slightly increased ;
When the ignition timing was retarded to 8 擄 CABTDC unburned methanol and formaldehyde emissions sharply increased .

3 . When the fuel injection timing is delayed , the in - cylinder mixed gas distribution can be effectively improved , the combustion quality is improved , the unburned methanol and the formaldehyde emission are obviously reduced ;
Unburned methanol and formaldehyde emissions were very high when the fuel injection timing was 57 擄 CA BTDC ;
When the injection timing was retarded to 53 擄 CA BTDC unburned methanol and formaldehyde emission decreased significantly ;
A slight decrease in unburned methanol and formaldehyde emissions was further delayed when the injection timing was positive .
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK401

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