摘要
研究气化燃烧反应对射流火焰噪声的影响,并对火焰噪声的特性进行分析。通过快速傅里叶变换(FFT)及声压级计算等方法,对火焰噪声信号进行频谱分析。结果表明,火焰噪声包含燃烧噪声和喷流噪声,主要是300Hz以下的低频波段噪声;火焰噪声以燃烧噪声为主,火焰根部噪声为喷流噪声;氧化剂比燃料更能影响火焰噪声,完全燃烧时,漩涡的大量产生导致更强的噪声。
Influence of combustion reaction to the noise of jet flame was studied. The nature of the noise of jet frame was analyzed. Employing Fast Fourier Transform （FFT） algorithm and sound pressure level algorithm, the frequency spectrum analysis of noise signals of flame was carried out. Results show that flame noise includes combustion noise and jet noise, dominantly lower than 300Hz, the flame noise is dominated by combustion noise, and the noise of root of flame is jet noise. Oxidizer gives more influ- ence on the flame noise than fuel. In the case of full combustion, large number of eddies will appear and induce very strong noise.
出处
《噪声与振动控制》
CSCD
北大核心
2008年第6期154-157,共4页
Noise and Vibration Control
基金
国家重点基础研究发展计划(2004CB217703)
上海市曙光计划(06SG34)
教育部新世纪优秀人才支持计划(NCET-06-0416)
关键词
声学
射流火焰
噪声
频谱分析
漩涡
acoustics
jet flame
noise
frequency spectrum analysis
eddy
