臺灣博碩士論文加值系統

本實驗主要在研究相向噴流衝擊擴散火焰燃燒現象，以等質量流率的甲烷燃料與鈍性氮氣對衝，藉由控制燃料流率使用不可燃氮氣與甲烷燃氣衝擊後之狀況，來觀察火焰彼此穿透的結構變化。由於氮氣具有吸熱不可燃特性，在觀察氮氣與甲烷衝擊後之等溫圖，可從焰內溫度變化很容易找出彼此衝擊後的穿透深度。由焰形及紋影顯示，火焰燃燒相當對稱，但燃燒的流場變化大時，整個火焰溫度是非對稱型態，所以量測整個火焰場數據來擷取資料，本實驗流率採用250ml/min(Re=81)，350ml/min(Re=113)，450ml/min(Re=145)等三種，並同時採用甲烷－甲烷對衝及氮氣－甲烷對衝等二種方式研究，實驗結果(1)流量調大後衝擊深度並不會跟著加深，焰溫亦不會隨著昇高；(2)由雷諾數為113，流量350ml/min，純甲烷燃燒時發現，燃料加倍並不能使燃燒效果增加 ，相反的會無謂的浪費有限的資源。(3)當甲烷流量為350ml/min，以等流率氮氣對衝時，在流率相等，衝擊點在正衝線上，外在空氣充足，均勻燃燒的情況下，會得到較大的穿透深度，所以根據觀察和實驗, 相向噴流衝擊擴散火焰表現的比相向噴流擴散火焰來的更為穩定均勻和有效率。

The experiments invest major on the reverse jet-pumping diffusion flame of burning phenomenon by using equal-mass-fluid-rate to observe the methane fuel and forbid burn nitric of face-to-face-pump phenomenon. And observe the penetration flame configuration change each other with control fuel-fluid-rate. Because forbid burn nitric has the character of endothermic and forbid burn. So, in observing face-to-face-pump of the methane fuel and forbid burn nitric of isothermal pictures , we can be from the change of flames temperature finding out the penetrating depth of jet-impinging diffusion flame .By experiment and observation, the pulsating flame behaves more stable and efficient than the continuous impinging flame. From the frame type and the veins shadow , the flames are normally symmetry. But when the fuel fluid rate varies large, the total flame temperature is non-symmetry , So, we measure the total flame field to get the detail data.
The experiment of fluid rate uses following three type sources, 250ml/min(Re=81), 350ml/min(Re=113) and 450ml/min(Re=145). And the experiment also separate two type to study ; The first type is methane fuel to methane fuel; The second type is methane fuel to forbid burn nitric.
The experimental results have following three point:
(1) If the fluid rate adjust large , the pulsating depth of flame isn’t large and the flame temperature isn’t rising.
(2) If the Renold Number is equal to 113 and the fluid rate is 350ml/min , adds twice the pure methane fuel, the combustion effects isn’t increasing.
(3) If the methane fuel fluid rate is equal to 350ml/min, the natural air is full, the combustion is well mixed, the pulsating point is on the upright pulsating line , and use equal fluid rate of forbid burn nitric pumping each other, we can obtain more large penetrating depth.
Recording to observation and experiment, the reverse jet-pumping pulsating flame is more stable and efficient the reverse jet-pumping diffusion flame of burning phenomenon by using equal-mass-fluid-rate.

目錄
頁次
中文摘要……………………………………………………………………i
英文摘要…………………………………………………………………...ii
誌謝………………………………………………………………………..iii
目錄………………………………………………………………………..iv
圖目錄………………………………………………………………….….vi
一、 前言………………………………………………………………….1
1-1 簡介………….…………………………………………………..1
1-2 應用與目的….…………………………………………………..2
二、 文獻探討……………………………………………………………..4
三、 實驗設計…………………………………………………………….10
3.1 實驗主題………………………………………………………10
3.2 主題說明………………………………………………………10
3.2-1 研究相向噴擴散火焰結構……………..…...............……10
3.2-1.1 噴嘴出口之燃料流量……………………..……..…10
3.2-1.2 噴嘴出口之質量流率……………………..……..…11
3.3 比較擴散火焰與相向衝擊擴散火焰之火焰穩定性…………11
3.4 實驗儀器………………………………………………………13
3.4-1 數位式氣體流量計…………….…..………….…………...13
3.4-2 精密平移台………………..………….……….…………...13
3.4-3 溫度量測系統………………………..………..…………...14
3.4-4 量測和資料收集設備……..…………………………..…...14
3.4-5 流場和火焰拍攝設備……………………………..…..…...15
3.4-6 光學設備…………………………………..…………..…...15
3.4-7 三維移動平台..……………………………………..……...16
四、 實驗方法……………………………………………………………17
4.1 撰寫控制程式………………………………………………….17
4.1-1 設定量測時間……………. .……………………………..17
4.1-2 設定量測方向…………. .………………………………..18
4.1-3 分析量測數據………. .…………………………………..18
4.1-4 實驗分析……………. .…………………………………..19
4.2 相向噴流擴散火焰結構………………………………………..19
4.2-1 燃料壓力管安排………. .…………. . …………………..19
4.2-2 噴嘴架設…..……………………………………………..19
4.2-3 schlieren(紋影法)光學分析火焰結構 ..………………. 20
4.2-4 火焰結構之影像拍攝…..…. .………………………….20
4.2-5 火焰溫度量測 …………. .……………………………..20
4.2-6 流量計流量調校…….…………………………………..21
4.3 比較 Diffusion Flame 與相向衝擊火焰之火焰穩定性 …..21
五、 結果討論………………………………………………………….22
5-1 甲烷流量在Re=81(250 ml/min)時與氮氣對衝之火焰說明… 22
5-2 甲烷流量在Re=113(350 ml/min)時與氮氣對衝之火焰說明…24
5-3 純甲烷流量在Re=113(350 ml/min)與甲烷氣對衝火焰說明…26
5-4 甲烷流量在Re=145(450 ml/min)與氮氣對衝火焰說明………28
六 實驗討論………………………………………………………….32
6.1.相向噴流衝擊擴散火焰Schlieren圖……………………….32 6.2.同一燃燒器角度(72.5度)不同燃料流速……………………32
6.3.同一燃燒器角度(72.5度)不同燃料流速比較………………34
6.4.同一燃燒器角度(72.5度)同燃料流速不同噴流之比較……35
6.5.同一燃燒器角度(72.5度)不同燃料流速之穿透深度比較…35
七、結論……………………………………………………………….37
八、未來發展…………...…………………………………………….38
九、參考資料…………...…………………………………………….39

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