高雷諾數低NOx預混弱漩渦噴流燃燒器：紊焰碎形特性定量量測

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楊政憲(Cheng-hsien Yang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

高雷諾數低NOx預混弱漩渦噴流燃燒器：紊焰碎形特性定量量測
(High-Reynolds-Number Low NOx Premixed Weak-Swirl Jet Burners: Quantitative Measurements of Fractal Characteristics for Turbulent Flames.)

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摘要(中)

本論文針對貧油預混甲烷/空氣之弱漩渦噴流火焰，執行一系列高紊流雷諾數(遠大於先前相關研究)燃燒實驗，利用二維雷射斷層攝影術(laser tomography，LT)及質點影像測速技術(particle image velocimetry，PIV)，定量量測紊焰之碎形特性與紊流燃燒速度。所採用之弱漩渦噴流燃燒器(weak swirl jet burner，WSJB)，類似先前研究Bédat & Cheng (1995)所設計，本研究共有兩組不同噴嘴直徑之WSJB，一為25 mm另一為50 mm，它可提供穩定駐留於燃燒器噴嘴出口之火焰。弱漩渦噴流火焰動態時序影像，係以高速高解析之CMOS攝影機(5000張/秒，512 × 512 pixels)所攝取，將影像二值化後，利用stepping-caliper碎形分析方法獲取火焰面之碎形參數，包括碎形維度(D3)和內外截止長度(?i；?o)等物理量。本實驗無因次紊流強度的範圍u?/SL ≈ 2.6 ~ 20.4，其中u?為均方根紊流擾動速度而SL為層流燃燒速度，而相對應之紊流雷諾數(ReT = u?LI/ν) 之範圍則從400至7,000，其中LI為流場之積分長度尺度而ν為空氣之運動黏滯係數。當u?/SL > 3，D3值僅為2.22且與u?/SL之大小無關，此結果不同於先前大部分學者之研究結果(如I.C. engines、Bunsen flames及V-shape flames等研究結果，找到D3 ≈ 2.33)。但本結果與Gülder團隊(2000)在本生燈型態火焰(ReT < 500)所獲之結果相符。而?i和?o值僅會隨著u?/SL的增加而略微下降，其減少變化範圍：當u?/SL從2.6增加到20.4，?i和?o值會從1.5 mm和12 mm略微減少到1.0 mm和10 mm。將前述實驗所得之碎形參數代入Gouldin (1987)所提出之紊流燃燒速度(ST)碎形理論模型中計算，並與本實驗PIV量測值做一比較，我們發現模型計算之ST值無法預測實際量測值，顯示出目前碎形數學模型有需要再做進一步的修正。

摘要(英)

This thesis measures fractal properties and turbulent burning velocities (ST/SL) of lean premixed methane/air weak swirl jet flames using laser tomography and particle image velocimetry (PIV). Two weak swirl jet burners (WSJB) of 25 mm and 50 mm diameters are applied, which are similar to the previous design by Bédat & Cheng (1995) for providing stabilized flames above. The instantaneous images of weak swirl jet flames were recorded by a high-speed, high-resolution CMOS camera (5,000 frames/s, 512 ? 512 pixels). After binarization, the flame front images were analyzed using the stepping-caliper method to obtain the fractal dimensions (D3) and inner and outer cutoff length scales (?I and ?o). In this study, the dimensionless turbulent intensities (u′/SL) of turbulence can be controlled from u′/SL = 2.6 to u′/SL = 20.4 with corresponding turbulent Reynolds number (ReT = u?LI/ν) ranging from 400 to 7000 which are much larger than previous studies, where u′, SL, LI and ? are the r.m.s. turbulent intensity, laminar burning velocity, integral length scale of turbulence, and kinematic viscosity of reactants, respectively. It is found that values of D3 are only 2.22 independent of u′/SL. This result differs drastically with most of previous studies, such as I.C. engines, Bunsen flames, and V-shape flames, that reported values of D3 ≈ 2.33 when u′/SL > 3. However, D3 ≈ 2.22 is in support of a previous study using Bunsen-type flames at smaller values of ReT (<500) by Gülder et al. (2000). As values of u′/SL increase from 2.6 to 20.4, values of ?i and ?o decrease from 1.5 mm and 12 mm to 1.0 mm and 10 mm. Finally, these fractal parameters obtained at high ReT cannot predict ST/SL correctly using available fractal area closure model, indicating a need for further improvement of existing fractal models.

關鍵字(中)

★ 預混紊流燃燒
★ 漩渦噴流火焰
★ 碎形維度
★ 內外截止長度
★ 紊流燃燒速度

關鍵字(英)

★ premixed turbulent combustion
★ swirl jet flame
★ fractal dimension
★ inner and outer cutoff length scales
★ turbulent burning velocity

論文目次

摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖表目錄 VII
符號說明 ix
第一章前言 1
1.1 研究動機 1
1.2 問題所在 2
1.3 解決方法 3
1.4 論文架構 4
第二章文獻回顧 6
2.1 薄碎焰理論(Flamelet model) 6
2.2 碎形分析(Fractal analysis) 7
2.3 漩渦火焰之原理 9
2.3.1 漩渦流場特性 9
2.3.2 漩渦流產生方式 11
2.3.3 漩渦火焰及燃燒器 11
第三章實驗設備與方法 18
3.1 弱漩渦噴流燃燒器 18
3.2 燃氣供應與控制系統 19
3.3 雷射斷層攝影術(Laser tomography) 20
3.3.1 火焰面影像二值化 22
3.4 碎形維度理論模式及分析方法 22
3.4.1 Stepping-caliper 23
3.4.2 Co-dimension 24
3.4.3 碎形維度與截止長度 24
3.5 高速質點影像測速技術(Particle image velocimetry) 25
3.6 紊流燃燒速度的量測及分析 26
3.7 實驗流程 27
第四章結果與討論 36
4.1 漩渦流場特性 36
4.2 預混紊流燃燒速度之量測 37
4.3 碎形維度與紊流強度之關係 38
4.4 截止長度尺度 39
4.5 碎形數學模式預測紊流燃燒速度 39
第五章結論與未來工作 47
5.1 結論 47
5.2 應用 48
5.3 未來工作 48
參考文獻 50

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指導教授

施聖洋(Shenq-yang Shy)

審核日期

2008-7-24

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