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为模拟高声压级时微缝处涡声相互作用现象并计算微缝声阻抗,发展了一种离散涡模型.联合微缝离散涡模型和一维声传播模型,计算了微缝共振器的声阻抗和吸声系数.数值结果表明,微缝声学性质主要取决于涡脱落和脱落涡层的演化;共振器的吸声系数随着入射声压级的增加而增大;入射声波频率对共振器吸声系数有显著影响.研究结果和先前直接数值模拟的结果符合较好.
In order to simulate the vortex-sound interaction at the micro-crack at high sound pressure level and calculate the acoustic impedance of the micro-slit, a discrete vortex model was developed. Combined with the micro-slit discrete vortex model and the one-dimensional acoustic propagation model, Acoustic impedance and sound absorption coefficient.The numerical results show that the acoustic properties of micro-suture mainly depend on the evolution of vortex shedding and shedding vortex; the sound absorption coefficient of resonator increases with the increase of incident sound pressure level; The sound absorption coefficient of the device has a significant effect.The results of the study are in good agreement with the results of the previous direct numerical simulation.