摘要
扬声器布置在Rijke管型燃烧器入口和出口处，输出不同频率和声压级的声波可以对热声不稳定进行开环主动控制。试验发现在热声管燃料入口燃料管路布置扬声器是一种有效的热声不稳定主动控制方法，扬声器发出的声波可以使热声不稳定的压力振荡有所衰减，同时也会产生新的和声波同频的压力振荡；在某些工况下，和声波同频的压力振荡幅值甚至会高于热声不稳定的压力振荡幅值；在本文试验中，当扬声器声波频率为50 Hz、声压级为100 dB时，控制效果最好，达到38.55%。布置在热声管开口端的扬声器也是一种有效的热声不稳定主动控制方法，在本文试验中，当扬声器声波频率为300 Hz、声压级为115 dB时，控制效果最好，此时控制效果可达34.58%。
Abstract
Using loudspeakers for active control, loudspeakers were placed on the fuel inlet pipe and the open end of the Rijke tube to output acoustic frequencies and sound pressure levels for open-loop active control of thermoacoustic instability. It was found that loudspeaker placed on the fuel inlet pipe was an effective method to control the thermoacoustic instability in the Rijke combustor. Sound waves from the loudspeaker could attenuate the thermoacoustic pressure oscillations. At the same time, new pressure oscillation with the same frequency of sound waves was generated. In certain experiment cases, the amplitude of new pressure oscillation caused by the sound waves could be higher than the amplitude of thermoacoustic instability. Under the experiment case with sound frequency of 50Hz and sound pressure level of 100dB, the pressure vibration amplitude reduction efficiency reached to 38.55%. It was also an effective method that placing the loudspeaker on the open end of the Rijke combustor. Under the experiment case with sound frequency of 300Hz and sound pressure level of 115dB, the pressure vibration amplitude reduction efficiency reached to 34.58%.
关键词
扬声器 /
Rijke型燃烧器 /
热声不稳定 /
控制效果
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Key words
loudspeaker /
Rijke combustor /
thermoacoustic instability /
control effect
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周昊 1,黄燕 1，丁芳 1，王恒栋 1，岑可法 1.
扬声器对Rijke型燃烧器热声不稳定控制效果的研究[J]. 振动与冲击, 2016, 35(22): 66-71
ZHOU Hao 1 HUANG Yan 1 DING Fang 1 WANG Hengdong 1 CEN Kefa 1.
Investigation of the Control Effects of the Loudspeaker to the Thermoacoustic Instability in the Rijke Combustor[J]. Journal of Vibration and Shock, 2016, 35(22): 66-71
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