高壓高溫化學計量預混正丁醇/空氣和第三丁醇/空氣燃氣之層流和紊流燃燒速度量測

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胡翰德(Fathin Muhammad Mahdhudhu) 查詢紙本館藏

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論文名稱

高壓高溫化學計量預混正丁醇/空氣和第三丁醇/空氣燃氣之層流和紊流燃燒速度量測
(Laminar and Turbulent Burning Velocities of Stoichiometric Premixed n-Butanol/Air and tert-Butanol/Air Mixtures Under High-Pressure, High-Temperature Conditions)

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至系統瀏覽論文 (2025-6-30以後開放)

摘要(中)

溫室氣體排放、燃料價格的不確定性以及尋找低汙染物排放的可再生能源選項，為許多學者研究生質燃料的主要目標。以醇類為基底的生質燃料被廣泛的接受作為汽油替代燃料選項之一，其可用於火花引燃之內燃機或是其他燃燒設備，來降低汙染物的排放。生質燃料丁醇和其異構物，其具有低不穩定性、低腐蝕性和在寒冷天氣下較少的引燃失效等優點。本論文以實驗之方式，研究正丁醇/空氣和第三丁醇/空氣混合物在溫度T = 373K、壓力 p = 1-5 atm和方均根紊流擾動速度u = 0-4.2 m/s之條件下的層流和紊流火焰燃燒速度(SL和ST)。實驗於一雙腔體風扇擾動之十字型燃燒器進行，藉由風扇對轉可於此燃燒器中心處產生一近似等向性紊流場，且平均速度可忽略不計，並使用高速攝影機記錄火焰半徑<R(t)>隨時間之變化，以求得SL和ST。另外，為了能與其他研究團隊量測之紊流燃燒速度進行比較，我們使用Bradley平均傳遞變數(c̅)將ST轉換至c̅ = 0.5處，故ST,c̅=0.5 = ST(<R>c̅=0.1/<R>c̅=0.5)2 = ST(1.4)2。

研究結果有主要三點。第一，正丁醇/空氣和第三丁醇/空氣混合物的層流火焰速度(SL)隨著壓力的增加而下降，相反地，在一相同的u條件下，紊流火焰燃燒速度(ST)隨著壓力增加而上升。ST的增加歸因於，壓力與運動黏滯係數的倒數成反比(  -1 p-1)，故壓力增加，雷諾數也會增加。第二，在相同條件下，正丁醇/空氣的SL和ST較第三丁醇/空氣混合物高，此一差異歸因於正丁醇和第三丁醇之件的化學反應路徑，且一般認知的直鏈燃料火焰速度較支鏈燃料快也適用於醇類。第三，本研究使用文獻常用的四個火焰速度一般通式，來觀察正丁醇/空氣和第三丁醇/空氣混合物的SL和ST之預測和其自我相似性。

摘要(英)

Greenhouse gas emissions, uncertainties related to fuel prices, and seeking different options for renewable energy with low emissions are the main goals for many researchers to venture into biofuel research. Alcohol-based biofuels are widely accepted as alternative fuel sources to partly or fully consume for spark-ignition engines or other combustion applications thereby reducing global warming emissions. Butanol isomers are interesting alcohol-based biofuels due to their advantages of low lubricity, low corrosion, and fewer ignition problems in cold weather. This study investigates experimentally the laminar and turbulent burning velocities (SL and ST) of n-butanol/air and tert-butanol/air mixtures at a constant high-temperature T = 373 K over a range of pressure p = 1-5 atm and r.m.s turbulent fluctuation velocity u = 0 – 4.2 m/s. Experiments were performed in a dual-chamber fan-stirred cruciform burner capable of generating near-isotropic turbulence with negligible mean velocities. A high-speed camera is used to record the time evolutions of flame radii <R(t)> within the experimental domain 25 mm ≤ <R(t)> ≤ 45 mm so that SL and ST can be determined. For turbulent burning velocity data convert using Bradley’s mean progress variable to ST,c̅=0.5 because it shows a better representative regardless of the flame geometries with ST,c̅=0.5 = ST(<R>c̅=0.1/<R>c̅=0.5)2 = ST(1.4)2.

Results show three main points. First, the value of the SL of n-butanol and tert-butanol mixtures decreases with increasing pressure. It indicates that n-butanol/air and tert-butanol/air mixture present the same instability behavior with the fact that the density of the unburned mixture (u) increases in proportion to the increase of pressure but the mass burning capability of laminar premixed flame has its limitation. In contrast, the value of ST increases with increasing pressure at any given u. The increase of Reynolds number plays a role in this situation because the pressure is inversely from kinematic viscosity,   -1 p-1. In addition, the laminar and turbulent burning velocities of the n-butanol/air mixture are generally faster than those of the tert-butanol/air mixture under the same conditions. The main reason for the difference value in the laminar and turbulent burning velocity between n-butanol and tert-butanol is chemical kinetics.. Moreover, normalization analysis of these measured ST/SL data of n-butanol/air and tert-butanol/air mixtures are made by using four selected general correlations from the literature to observe their predication merits and drawbacks.

關鍵字(中)

★ 正丁醇
★ 叔丁醇
★ 層流燃燒速度
★ 湍流燃燒速度
★ 一般相關性

關鍵字(英)

★ n-Butanol
★ tert-Butanol
★ Laminar Burning Velocity
★ Turbulent Burning Velocity
★ General Correlations

論文目次

Abstract vi
摘要 vii
Content viii
List of Figures x
List of Tables xii
Nomenclature xiii
Chapter I Introduction 1
1.1 Background 1
1.2 Objective 4
1.3 Thesis Outline 5
Chapter II Literature Review 6
2.1 Butanol 6
2.2 Laminar Premixed Combustion 9
2.2.1 Laminar burning velocity 11
2.2.2 Laminar burning velocity of butanol 13
2.2.3 Pressure effect on the laminar burning velocity of butanol 15
2.3 Turbulent Premixed Combustion 18
2.3.1 Turbulent Regimes 19
2.3.2 Turbulent burning velocity of butanol 21
2.4 General correlation with Lewis number consideration 22
2.4.1 General correlation proposed by Nguyen et al. (Originated from Kobayashi et al., Liu et al., and Chaudhuri et al.) 23
2.4.2 General correlation proposed by Bradley et al. 28
Chapter III Experimental Methods 30
3.1 Premixed combustion facilities 30
3.1.1 Cruciform burner 30
3.1.2 Heating system 33
3.1.3 Fuel supplied system 34
3.1.4 Flame imaging system 34
3.2 Parameters calculation 36
3.2.1 Equivalence ratio 36
3.2.2 Lewis number 37
3.3 Experimental procedures 39
Chapter IV Results and Discussion 41
4.1 Flame propagation image 41
4.2 Determination of laminar burning velocities 42
4.3 Determination of turbulent burning velocities 43
4.4 Pressure effect on the laminar burning velocities 45
4.5 Pressure effect on the turbulent burning velocities 47
4.6 Turbulent intensity effect on the laminar and turbulent burning velocity 48
4.7 General correlations 50
Chapter V Conclusions and Future Works 53
5.1. Conclusion 53
5.2 Future works 53
Bibliography 55

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指導教授

施聖洋(Shenqyang (Steven) Shy)

審核日期

2023-7-4

推文