论文信息 - Transmission of spinning acoustic modes in a slightly non-uniform duct

Transmission of spinning acoustic modes in a slightly non-uniform duct

Abstract The transmission of spinning acoustic modes through a throat in a long cylindrical duct is considered. Gradients in the mean axial flow as well as non-uniform physical boundaries cause back scattering of the incident waves. Only part of the incident wave energy is transmitted. At an axial flow Mach number of 0·6 a substantial attenuation of wave energy is found for throats with reasonable area reduction.

Christopher K. W. Tam

[1] D. Pridmore‐Brown,et al. Sound propagation in a fluid flowing through an attenuating duct , 1958, Journal of Fluid Mechanics.

[2] T. G. Sofrin,et al. Axial Flow Compressor Noise Studies , 1962 .

[3] J. F. Wilby,et al. THE DEVELOPMENT OF ENGINEERING PRACTICES IN JET, COMPRESSOR, AND BOUNDARY LAYER NOISE , 1969 .

[4] R. Lindsay,et al. Elements of gasdynamics , 1957 .

[5] P. Morse,et al. Methods of theoretical physics , 1955 .

[6] On finite amplitude spinning acoustic modes and subsonic choking , 1971 .

[7] C. L. Morfey,et al. Rotating pressure patterns in ducts: Their generation and transmission , 1964 .

[8] P. Mungur,et al. Acoustic wave propagation in a sheared fluid contained in a duct , 1969 .