Experimental studies of flame transfer function in acoustically excited rijke burners

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題名:	Experimental studies of flame transfer function in acoustically excited rijke burners
其他題名:	振盪RIJKE燃燒爐中火焰轉移函數實驗探討
作者:	陳增源;Chen, Tzeng-Yuan;陳建邦;Chen, Chien-Pang
貢獻者:	淡江大學航空太空工程學系
關鍵詞:	預混層流火焰;Rijke管;聲導納;火焰轉移函數;Premixed Laminar Flame;Rijke Tube;Acoustic Admittance;Flame Transfer Function
日期:	1999-12
上傳時間:	2010-01-11 15:03:42 (UTC+8)
摘要:	本研究實驗探討一聲波激擾之垂直管道，位於管道下方一預混層流火焰之火焰移轉函數。本實驗類似於Rijke管的配置方式，在管道中一端分別導入三個不同聲納之燃燒爐。火焰轉移函數係由火焰區上下游所量測之聲波強度來決定，它與火焰上下游的壓力及速度有關。正值得火焰轉移函數代表火焰可能產生自發性振盪。研究結果顯示火焰轉移函數與火焰所在位置之流聲導納有著很大的關聯。火焰在聲波場所在之位置決定火焰轉移函數之正負值，同時，也決定其大小，火焰當量比所扮演的角色，僅是決定火焰轉移函數之大小。研究結果同時顯示火焰轉移函數之特性可由火焰所在位置聲導納虛部來預測。 This research experimentally investigates the flame transfer function in an acoustically excited vertical duct with a laminar premixed flame anchored on a grid located in the lower half of the duct. The experimental configuration is similar to a Rijke tube with three burners of different burner surface acoustic admittances placed separately into one end of the duct. The flame transfer function is determined from the measured acoustic intensity upstream and downstream of the flame zone, which relates both the acoustic velocities and pressures either side of the flame zone. A positive flame transfer function represents that a flame has the possibility to cause a self-excited acoustic oscillation. Results of this research reveal that the flame transfer function is a strong function of the nonreactive acoustic admittance at the flame location. The sign of the flmae transfer function is dominated by the location of flame zone on the acoustic field that is also important in the magnitude of flame transfer function. The flame equivalence ratio plays a role mainly in determining the magnitude of the flame transfer function. This study also shows that the characteristic of the flame transfer funciton could generally be predicted by knowing the imaginary part of nonreactive acoustic admittance at the flame location. This research experimentally investigates the flame transfer function in an acoustically excited vertical duct with a laminar premixed flame anchored on a grid located in the lower half of the duct. The experimental configuration is similar to a Rijke tube with three burners of different burner surface acoustic admittances placed separately into one end of the duct. The flame transfer function is determined from the measured acoustic intensity upstream and downstream of the flame zone, which relates both the acoustic velocities and pressures either side of the flame zone. A positive flame transfer function represents that a flame has the possibility to cause a self-excited acoustic oscillation. Results of this research reveal that the flame transfer function is a strong function of the nonreactive acoustic admittance at the flame location. The sign of the flmae transfer function is dominated by the location of flame zone on the acoustic field that is also important in the magnitude of flame transfer function. The flame equivalence ratio plays a role mainly in determining the magnitude of the flame transfer function. This study also shows that the characteristic of the flame transfer funciton could generally be predicted by knowing the imaginary part of nonreactive acoustic admittance at the flame location.
關聯:	一九九九中華民國「航太學會/燃燒學會/民航學會」航太學術聯合會議論文集=Proceedings of the 1999 AASRC/ CIROC/ CSCA Aerospace Joint Conference，頁539-546
顯示於類別:	[航空太空工程學系暨研究所] 會議論文

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