微缝共振器的非线性吸声机理
Nonlinear acoustic dissipation mechanism of a slit resonator
-
摘要: 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.Abstract: To simulate the vortex/sound interaction phenomenon at a slit with high sound pressure level and calculate the acoustic impedance of the slit,a discrete vortex model was set up.By combining the discrete vortex model with a one-dimensional sound propagation model,the acoustic impedance and the absorption coefficient of the slit resonator were calculated.The numerical results reveal that the acoustic properties of the slit are dominated by the vortex shedding and the evolution of the vortex sheet;the absorption coefficient of the resonator increases with the increase of the sound pressure level;the frequency of the incident sound has significant influence on the absorption coefficient of the resonator.The present results agree well with the previous direct numerical simulation (DNS) results.
-
Key words:
- slit resonator /
- high sound intensity /
- vortex/sound interaction /
-
[1] Dupere I D J,Dowling A P.The use of Helmholtz resonators in a practical combustor[J].Journal of Engineering for Gas Turbines and Power,2005,127(2):268-275. [2] Smits J M H,Kosten C W.Sound absorption by slit resonators[J].Acustica,1951,1(1):114-122. [3] Gomperts M C.The sound insulation of circular and slit-shaped apertures[J].Acustica,1964,14(1):1-16. [4] 马大猷.微缝吸声体理论[J].声学学报,2000,25(6):481-485. MA Dayou.Theory of microslit absorbers[J].ACTA Acustica,2000,25(6):481-485.(in Chinese) [5] 刘克.微穿孔板和微缝板吸声体研究进展[J].应用声学,2002,21(1):3-6,25. LIU Ke.Advances in the study of microperforated-panel and microslit acoustic absorbers[J].Applied Acoustics,2002,21(1):3-6,25.(in Chinese) [6] Jing X,Sun X.Discrete vortex simulation on the acoustic non-linearity of an orifice[J].AIAA Journal,2000,38(9):1565-1572. [7] Dowling A P,Hughes I J.Sound absorption by a screen with a regular array of slits[J].Journal of Sound and Vibration,1992,156(3):387-405. [8] Howe M S.The influence of vortex shedding on the diffraction of sound by a perforated screen[J].Journal of Fluid Mechanics,1980,97(4):641-653. [9] Ingard U,Labate S.Acoustic circulation effects and the nonlinear impedance of orifices[J].Journal of the Acoustical Society of America,1950,22(2):211-218. [10] Ingard U,Ising H.Acoustic nonlinearity of an orifice[J].Journal of the Acoustical Society of America,1967,41(6):1582-1583. [11] Cummings A,Eversman W.High amplitude acoustic transmission through duct terminations:theory[J].Journal of Sound and Vibration,1983,91(4):503-518. [12] Melling T H.The acoustic impendance of perforates at medium and high sound pressure levels[J].Journal of Sound and Vibration,1973,29(1):1-65. [13] Hersh S,Walker B E,Celano J W.Acoustic behavior of Helmholtz resonators Part 1:nonlinear model[J].AIAA Journal,2003,41(5):795-808. [14] Tam C K W,Ju H,Jones M G,et al.A computational and experimental study of slit resonators[J].Journal of Sound and Vibration,2005,284(3-5):947-984. [15] Brown C E,Michael W H.Effect of leading edge separation on the lift of a delta wing[J].Journal of the Acoustical Society of America,1954,21(5):690-706. [16] Rott N.Diffraction of a weak shock with vortex generation[J].Journal of Fluid Mechanics,1956,1(1):111-128.
点击查看大图
计量
- 文章访问数: 1922
- HTML浏览量: 0
- PDF量: 11
- 被引次数: 0