谐振管对开口式热声发生器声学性能的影响研究OACSTPCD

An open-air traveling wave thermoacoustic generator was theoretically modeled by the transfer matrix method and the nonlinear dissipation model of the open end.The relationship among the real part of the impedance of the open end,the volume flow rate at the opening and the pressure loss coefficient affected by the geometry of the open end were obtained.The acoustic characteristic parameters of resonant frequency,internal pressure amplitude and sound pressure level at 1 m far away from the open end were theoretically analyzed.Experiments were carried out by using different resonators with different diameters and cone tubes with different angles.The influence of the length and diameter of the resonator on the frequency of the system was discussed.The results showed that the model in this paper can reflect the influence of the diameter and length of the resonant tube on the frequency,and the calculation error is less than 5％.The cone tube at the open end can reduce the energy loss during suction,and then significantly increase the pressure inside the device.When the cone tube is 40° at the opening and the diameter and length of the resonator is 46 mm and 730 mm,respectively,the sound pressure level at 1 m far away can reach 110.2 dB.