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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 潘國隆(Kuo-Long Pan) | |
dc.contributor.author | Shan-Jen Chen | en |
dc.contributor.author | 陳善任 | zh_TW |
dc.date.accessioned | 2021-06-17T06:40:02Z | - |
dc.date.available | 2021-08-18 | |
dc.date.copyright | 2018-08-18 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-08-15 | |
dc.identifier.citation | 參考文獻
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/72398 | - |
dc.description.abstract | 本研究藉串列雙圓柱做流場控制,以改進非預混燃燒之單多孔圓柱在接近熄滅時,尾焰受尾流區過量冷空氣與渦旋擾動,造成局部過於貧油或反應物滯留時間不足而熄滅之現象,並探討與單圓柱相比其能提升熄滅極限之能力。研究中以紋影法觀察圓柱暫態熱流場與火焰型態之關係,並藉化學螢光與沿尾流區中心線溫度之量測,以了解反應區條件;亦藉Fluent搭配SST k-ω紊流模型模擬協助分析不同距徑下之反應流場條件。
在流場結構方面,紋影像顯現串列擺置可抑制或推延尾流渦旋至更下游,使流場不穩定遠離反應區,雙圓柱間隙亦可使反應物躲避高速氣流並提供滯流與混和的空間;在熱交互作用方面,因圓柱間隙流場相對穩定,其可蓄存高溫未燃氣使雙圓柱之反應區進行燃燒,並藉熱交互作用以互相維持,故可觀察到火焰間歇性連接、再引燃等現象。以兩圓柱軸線間距與圓柱直徑之比值L/D為參數,設定液化石油燃氣噴出速度為Vw = 0.154 cm/s,串列雙圓柱之燃燒在L > 2D時因圓柱間隙過大引入渦旋,故上游圓柱熄滅後無法復燃;1.8 ≤ L ≤ 2D則會出現圓柱間隙內藉擾動將下游圓柱引燃之火苗傳遞至上游進行再引燃,使熄滅的上游圓柱復燃為尾焰;L < 1.8D兩圓柱之反應區不會完全分離,並會同時熄滅。 模擬結果顯示圓柱間隙紊流強度與流速隨間距提升而增加,燃氣濃度則因迴流結構增強而下降,使熄滅極限降低之原因:(1)距徑比過小,因空氣難藉渦旋引入圓柱間隙,反應區移出低速的間隙區域,(2)距徑比過大,因渦旋於間隙內增強,過多冷空氣捲入使熱交互作用式微,反應物滯留時間亦縮短。單與雙圓柱總燃料流率相同的條件下,單圓柱熄滅極限隨燃氣供給量增加而提升,但增長趨勢趨緩,串列組合間隙能藉流場控制與熱交互作用改善其熄滅極限增長趨緩的現象。 | zh_TW |
dc.description.abstract | The objective of this research is to control the flow field by arranging dual porous cylinders in tandem, thus enhancing the ability of the cylinders from blow-out. The wake flame of a single cylinder near the extinction limit would endure excessive cold air and concomitant fierce turbulence. This will lead to locally fuel-lean condition and insufficient time to react. The capability for tandem array to extend extinction limit was investigated and the results were compared with the usage of a single cylinder.
In the experiments, the thermal flow structure of non-premixed flame on dual porous circular cylinders arranged in tandem was visualized by schlieren imaging. The spacing to diameter ratio denoted by L/D is a major parameter in this research. The reaction conditions were studied by chemiluminescnece and temperature measurement along the center line of wake region. Furthermore, the software Fluent with SST k-ω turbulence model was used to analyze the reacting flow field with distinct spacing of cylinders. As to flow structure, not only the inhibition of vortices in wake region shown by schlieren imaging, but a shield for reactants in the gap and downstream cylinder from the high-speed airflow are achieved by tandem array. Also, the gap between the two cylinders created a confined space, which provided a region for fuel and air to stay and mix. As to the thermal interaction effect, reaction zones of the two cylinders could thermally support each other in the gap. The region was relatively stable in the whole flow field and was able to secure the hot unburnt gases. The phenomenon of intermittent connection of flames or re-ignition was thus observed. The fuel (LPG) ejection velocity Vw was set at 0.154 cm/s. When the two cylinders in tandem array are burning, the upstream one could not be reignited due to the fierce vortices in the gap with L > 2D. For 1.8 ≤ L/D ≤ 2, the upstream cylinder could be reignited by the flame kernel which is ignited by downstream cylinder and is moving from downstream to upstream. This process would make the upstream cylinder recover back to wake flame from extinction. For L < 1.8D, reaction zones of the two cylinders will not separate thoroughly and will be blown out simultaneously. Results of simulation show that the turbulence intensity and flow speed in the gap enhance with the increase of L/D. Causes for the decreased extinction limit are: (1) L/D is too small for the air to entrain into the gap by vortices. Therefore, the reaction zone moves outward from the gap where the flow is relatively stable. (2) L/D is too large and the turbulence intensity gets strong. Since excess air is introduced into the gap, the residence time for reactants decreases. The extinction limit of a single cylinder is enhanced with the increase in fuel flow rate, but the increasing trend would gradually slow down. With the same total fuel rate, the tandem array can elongate the residence time for reactants, thus improving the slowdown trend in extinction limit. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T06:40:02Z (GMT). No. of bitstreams: 1 ntu-107-R05522302-1.pdf: 9607990 bytes, checksum: 7c57ca809c4b340ff58d97d6fdcbd7df (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 口試委員審定書 I
誌謝 II 摘要 III Abstract IV 目錄 VI 圖目錄 X 表目錄 XV 符號說明 XVI 第一章 緒論 1 1.1 前言 1 1.2 多孔性圓柱之應用潛力 2 1.3 研究動機 4 1.4 研究目的 4 1.5 本文架構 6 第二章 文獻回顧 7 2.1 火焰燃燒模式 7 2.1.1 擴散火焰 7 2.1.2 預混火焰 7 2.1.3 部分預混火焰 9 2.2 多孔圓柱燃燒之相關研究 9 2.2.1 對衝擴散火焰(Counterflow diffusion flame) 9 2.2.2 熄焰與Da數之關係 13 2.2.3 多孔圓柱之火焰型態 14 2.2.4 多孔圓柱預混富氧燃燒 16 2.3 串列雙圓柱繞流之流場特性 17 2.4 雙圓柱燃燒熄滅極限之研究 19 2.4.1 水平對置 19 2.4.2 交錯排列 20 2.5 熱效應對流場結構之影響 21 2.6 火焰穩定性與交互作用 21 2.6.1 鈍體穩焰之機制 22 2.6.2 火焰之交互作用 24 2.7 火焰之化學螢光(Chemiluminescence) 26 第三章 實驗設備與原理 28 3.1 多孔圓柱燃燒器規格 28 3.2 燃氣流量控制系統 30 3.2.1 燃氣組成 30 3.2.2 燃氣流量控制原理 31 3.3 強制流場供給系統 34 3.3.1 鼓風機 34 3.3.2 變頻器 35 3.3.3 低速風洞 36 3.4 火焰型態影像擷取 39 3.5 紋影法(Schlieren)顯影系統 39 3.5.1 紋影法成像方法 39 3.5.2 紋影法架構 40 3.6 化學螢光法觀測 43 3.7 溫度量測 44 第四章 實驗內容與流程 46 4.1 變頻器頻率與風速關係式 46 4.2 定性觀察 48 4.3 定量觀察 48 4.4 實驗步驟 49 4.5 量測誤差 50 第五章 數值模擬建立 52 5.1 幾何條件與假設 52 5.2 統御方程式 54 5.3 物理模型 55 5.3.1 紊流模型 55 5.3.2 燃燒模型 58 5.4 數值方法 58 5.5 網格收斂性測試與驗證 62 第六章 結果與討論 64 6.1 單支多孔圓柱 64 6.1.1 單圓柱之火焰型態與熱流場 64 6.1.2 熄滅之暫態過程 73 6.2 串列雙多孔圓柱 76 6.2.1 串列雙圓柱之火焰型態與熱流場 76 6.2.2 熄滅與再引燃之暫態過程 82 6.2.3 渦旋之抑制 87 6.3 距徑比對熄滅極限之影響 94 6.3.1 串列與單圓柱熄滅極限之比較 94 6.3.2 火焰型態與距徑比之關係 99 6.3.3 熱流場數值模擬分析 105 6.4 燃氣噴出速度與迎風側塗層對熄滅極限之影響 112 6.4.1 燃氣噴出速度之效應 112 6.4.2 迎風側塗層之效應 115 第七章 結論與未來展望 118 7.1 結論 118 7.2 未來展望 120 參考文獻 122 附錄 127 | |
dc.language.iso | zh-TW | |
dc.title | 串列雙多孔性圓柱非預混焰之熱流場結構與熄滅極限 | zh_TW |
dc.title | Thermal Flow Structure and Extinction Limit of Non-Premixed Flame on Dual Porous Cylinders Arranged in Tandem | en |
dc.type | Thesis | |
dc.date.schoolyear | 106-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王興華(Ching-Hua Wang),林大惠(Ta-Hui Lin),吳明勳(Ming-Hsun Wu),趙怡欽(Yei-Chin Chao) | |
dc.subject.keyword | 串列擺置,多孔性圓柱,紋影法,流場控制,熱交互作用,熄滅極限, | zh_TW |
dc.subject.keyword | Tandem arrangement,Porous cylindrical burner,Schlieren,Flow control,Thermal interaction,Extinction limit, | en |
dc.relation.page | 129 | |
dc.identifier.doi | 10.6342/NTU201803224 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-08-16 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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