The passive control method of thermoacoustic instability was researched through experimental methods. A horizontally placed Rijke tube

a thermoacoustic instability experimental device

was set up; and an electrically heated hot gauze was used as a heat source in Rijke tube. It was found in the experiment that the temperature of the air before and behind the hot gauze had a crucial effect on the amplitude of the thermoacoustic oscillations. Moreover

sound linings with back cavity and perforated plate structures were used to control thermoacoustic instability. The bias air can be drained into the back chamber

and the flow and temperature of the bias air can be adjusted. It was also found that the biased air in the back cavity can enhance the inhibitory effect on the instability

and the effect became better with the increase of the bias flow rate; in addition

increasing the temperature of the biased air can not significantly increase the control effect of sound linings on thermoacoustic instability.