Investigation on nonlinear thermo-acoustic characteristics of Rijke tube  

作　　者：DENG Kai WU Yunfei LI Hua FANG Deming ZHONG Yingjie 

机构地区：[1]Institute of Energy and Power Engineering, Zhejiang University of Technology Hangzhou 310014 [2]Inst. of Processing Equip. and Control Engineering, Zhejiang Univ. of Technology Hangzhou 310014

出　　处：《Chinese Journal of Acoustics》2011年第4期417-426,共10页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(50576087,51106139)

摘　　要：Based on the energy conservation relationship, nonlinear thermo-acoustic effects of Rijke tube including instability range, saturation processes and higher harmonics modes were investigated. With coupling between the external flow and the inner space of a Rijke tube, the acoustic characteristics of self-excited oscillation were simulated. The experimental study was also carried out and the results were compared with those from simulation. The nonlinear factors which distort the acoustic waveform distortion were analyzed. From the results, it is seen that varying size of the nozzle outlet changes the acoustic impedance in the boundary, and leads to reduction of the nonlinear effects. The results show that the modes of self-excited oscillation could be influenced by the position of higher harmonics. In the large amplitude oscillation, the distortion of pressure wave within Rijke tube could be induced by the acoustic losses due to vortices on nozzle. It is found that the waveform distortion could be avoided by the shrinkage of nozzle.Based on the energy conservation relationship, nonlinear thermo-acoustic effects of Rijke tube including instability range, saturation processes and higher harmonics modes were investigated. With coupling between the external flow and the inner space of a Rijke tube, the acoustic characteristics of self-excited oscillation were simulated. The experimental study was also carried out and the results were compared with those from simulation. The nonlinear factors which distort the acoustic waveform distortion were analyzed. From the results, it is seen that varying size of the nozzle outlet changes the acoustic impedance in the boundary, and leads to reduction of the nonlinear effects. The results show that the modes of self-excited oscillation could be influenced by the position of higher harmonics. In the large amplitude oscillation, the distortion of pressure wave within Rijke tube could be induced by the acoustic losses due to vortices on nozzle. It is found that the waveform distortion could be avoided by the shrinkage of nozzle.

关 键 词：RIJKE管 非线性因素 声学特性 自激振荡 高次谐波 波形失真 非线性效应 节约能源 

分 类 号：TN72[电子电信—电路与系统] TQ038[化学工程]