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題名 | Combustion and Stabilization Characteristics of a Branched Flame under Helmholtz-Type Excitation=共振激擾下分歧火燄的燃燒及穩定特性 |
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作者 | 趙怡欽; 許紘瑋; 曾照暉; | 書刊名 | 燃燒學會會刊 |
卷期 | 7:3=24 1998.09[民87.09] |
頁次 | 頁6-11 |
分類號 | 446.1 |
關鍵詞 | 共振激擾; 分歧火燄; 燃燒; 穩定性; |
語文 | 英文(English) |
中文摘要 | 實驗上利用共振激擾再次研究分歧火燄的燃燒、穩定及汙染特性。分歧火燄的火 燄長度較短且燃燒劇烈。高振幅的共振激擾導致大量的外圍空氣捲入及分歧火燄內部的高速 度振盪。分歧火燄的火燄與熱氣強烈的振盪造成劇烈燃燒及增強熱傳,致使有效的節省燃料 (於本研究中可節省燃料達 25-30%)。火燄的分歧與側向噴流現象有重大的關聯。 高振幅聲 波共振激擾所產生的強烈速度振盪使得環狀渦流結構於穗帶區內進行強烈的加速與減速循環 而造成了噴流流體的堆積。此堆積效應提供了足夠的噴流流體於稍後複雜的流向渦流交互作 用及軸向不穩定中產生側向噴流。外圍空氣捲入的空氣動力效應與側向噴流的交互作用提供 了較高的可燃油氣出現機率及較低的應變率以幫助在高振幅激擾下分歧火燄的穩定。此外於 分歧火燄的 NOx 排放指數較未激擾狀態下高出 30%,而 CO 排放指數則較之低 50%。 |
英文摘要 | The combustion, stabilization, and pollution characteristics of the newly rediscovered branched flam are experimentally investigated using a Helmholtz-type resonator. The flame length of the branched flame is short and the combustion is intense. High amplitude resonant excitation induces strong entrainment and high velocity oscillation in the branched flame. Intense combustion and enhanced heat transfer due to strong oscillation of the flame and hot gases of the branched flame result in significant fuel saving, 25-30% saving can be achieved in this study. The flame branching is strongly associated with the side jet phenomenon. the strong acceleration of the ring vortex structure and deceleration in the braid region in a cycle due to strong velocity oscillation of high amplitude acoustic resonant excitation results in accumulation of jet fluid. This accumulation effect provides sufficient jet fluid for generation of the side jet in the subsequent complex interaction of the streamwise vortex and azimuthal instability. The effects of aerodynamic entrainment and interaction of the side jet provides high F probability and low strain rate to sustain a branch of the flame which helps to stabilize the whole flame under high amplitude excitation NOx emission index for the branched flame is 30% higher and CO emission index is 50% lower than the unexcited case. |
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