To investigate the principle of thermoacoustic interaction, a series of experiments on a heat duct (Rijke tube) are studied. The influence of heat source location and temperature on the sound pressure and frequency in Rijke tube is provided. Besides the linear characteristics, the nonlinear phenomena in Rijke tube are presented, such as instantaneous character, heat source temperature saturation, and how the variation of inlet velocity, outlet acoustical condition, and outlet temperature affects the acoustic field in tube. The results show that the acoustic change in Rijke tube can be highly nonlinear. Finally, a mathematical model for unsteady thermo-acoustic interaction in Rijke tube is employed, and a solution is given by modal analysis. Then the method is used to explain the performances of Rijke tube.
展开▼
