Experimental Study of Acoustic Characteristics of Jet Flame with Twin-Fluid Air-blast Atomizing Burner
The acoustic characteristics of jet flame with twin-fluid air-blast atomizing burner in different combustion conditions are presented. Acoustic signals of jet flames were analyzed by four band-scale wavelet and Fast Fourier Transform (FFT), which related to the turbulent combustion characteristic. The experimental results show that the jet flames appear four stages, which are laminar flow, turbulence, violence and blowout flame, with the increase of oxidant flow rate. Laminar flame generates a low-power noise with a basic frequency of about 26Hz. Turbulent flame, which contains a similar basic frequency with the laminar flame, als℃oncludes a broadband noise of 30～80 Hz. The basic frequency and the harmonic frequency of the violent flame noise are 17Hz and 47Hz, respectively. However, the amplitude value of the violent flame reaches 100, far more than that of the laminar and the turbulent flames.When the oxidant flow rate increases fiercely, the flame will blow out and generate a strong shock-wave in 0Hz. Moreover, the basic frequency of atomization noise under the cold condition is also 26Hz, which can be concluded that the flame noise is coupled with the atomization noise and the combustion noise. There is a closely relationship between the acoustic characteristics and the jet flame combustion states.The processing of flame acoustic signals can be used as a method to monitor the flame stability.
air-blast atomizing acoustic characteristics basic frequency combustion turbulence
SHISEN YAN QINFENG LIANG QINGHUA GUO GUANGSUO YU ZUNHONG YU
Key Laboratory of Coal Gasification of the Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）