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題名 | Numerical Studies of the Combustion of Methane-Air Mixture in a Meso-Scale TPV Combustor with a Heat-Regeneration Reverse Tube and a Porous-Medium Injector=熱光電動力系統之小型燃燒器搭配迴流管與多孔性介質燃料噴射裝置於甲烷/空氣混合燃燒數值模擬之研究 |
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作者 | 王維雋; 洪振益; 趙怡欽; | 書刊名 | 中國機械工程學刊 |
卷期 | 33:2 2012.04[民101.04] |
頁次 | 頁149-160 |
分類號 | 447.553 |
關鍵詞 | 可攜式熱光電動力系統; 燃燒器; 多孔性介質燃料; Combustion; Thermophotovoltaic system; TPV system; Simulation; Porous medium; |
語文 | 英文(English) |
中文摘要 | 本文的研究重點在於將一小型燃燒器,應用於可攜式熱光電(TPV)動力系統之設計與探討。其燃燒器設計上,運用熱再生迴流管(Heat-regeneration reverse tube)和提升空氣與氣態燃料混合之多孔性介質燃料噴射裝置(porous-medium)一起用來改善在發展小型熱光電系統(miniature thermophotovoltaic system)所面臨到的低亮度與不完全燃燒的相關問題。此外,本文數值模擬現階段主要運用計算流體流動模擬搭配二階(two-step)的化學燃燒反應機制來運算求解,進而從中探討與分析更近一步之空氣-氣態燃料混合場(fuel-air mixing)與火焰穩駐機制(flame stabilization mechanisms)之現象。除此之外,當燃燒器物理尺度縮小時,因為高面體比(surface-to-volume ratio, S/N)造成火燄與壁面接觸的面積增加,也許導致冷熄(flame quenching)現象的產生,進而使這些相關之熱管理(thermal conditions)議題變得非常重要,因此本文也運用了數值模擬技術去探討與分析各種不同燃燒器壁面熱傳條件下,例如不同燃燒器壁面之熱傳導係數所造成之相關流場特徵及火燄燃燒現象去探討與分析。並且,其結果證實了小型燃燒器搭配迴流管(heat-regeneration reverse tube)和多孔性介質燃料噴射裝置(porous-medium)可改善因不完全燃燒和太短的火焰滯留時間所造成輻射器(Emitter)的亮度不均勻或是表面溫度太低的情形,進而可以促進發亮均勻和增加表面溫度而使火燄可完全被限制在燃燒器內。相同地,其數值模擬結果也指出了控制相關氣體流率、熱損失條件及維持恰當的熱管理可持續使火燄在燃燒器內穩定燃燒。因此,藉由此數值模擬結果之分析,可獲得最佳化之相關設計條件及參數,並且可運用於小型燃燒室搭配熱再生迴流管與多孔性介質燃料噴射裝置之設計。 |
英文摘要 | The major objective of this paper is to develop a miniature combustor applied in a portable thermophotovoltaic (TPV) power generation system. The proposed miniature TPV system consists of a swirling combustor with the infrared thermal tube (ZrO2) acting as the emitter, a heat-regeneration reverse tube, and mixing-enhancing porous-medium fuel injection, which improves the low non-uniform illumination or incomplete combustion problems associated with conventional miniature TPV systems. A two-step global reaction mechanism was used to compute the chemical reactions of the reacting flows. Numerical simulations are performed to analyze the details of the flame structure and flame stabilization mechanism inside the meso-scale combustor with and without a reverse tube. In addition, these thermal conditions have strong effects on the combustion especially when the chamber dimension goes small and the ratio of surface area to volume becomes larger. Such as larger heat loss through the chamber wall to the ambient, may lead to the thermal quenching of meso-scale combustion. Therefore, the effect of various heat transfer conditions at chamber wall, e.g. with different wall heat conductivity on the combustion is delineated and discussed by numerical simulation. Results indicate that the proposed swirling combustor with a heat-regeneration reverse tube and porous medium can improve the intensity and uniformity of the combustion chamber (emitter) illumination, and can increase the surface temperature of the chamber wall. Correspondingly, the simulation results also indicated that the stable combustion in a meso-scale TPV combustor may be sustained through to control mass flow rate, heat loss conditions and maintaining proper thermal condition. Consequently, through such systematic numerical analysis, proper operational parameters for the meso-scale TPV combustor are suggested, which may be used as the guideline for meso-scale TPV combustor design. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。