Abstract
The two-microphone technique has been used to obtain data from which values of acoustic impedance have been calculated for perforated-sheet linings. The magnitude and argument of the impedance values have been plotted as a function of frequency, wave amplitude, and duct Mach number for five different lining geometries. These results are compared to theoretical values of lining impedance obtained from a set of equations based on past work [E.J. Rice and C.E. Feiler, NASA TN D-6178 (1971); E.J. Rice, AIAA Paper 73–995 (1973); W.A. Bell, B.R. Daniel, and B.T. Zinn, AIAA Paper 74–61 (1974); A.S. Hersh and T. Rogers, AIAA Paper 75–495 (1975)]. Although the agreement between experiment and theory is good in general, it is not good in detail because the complicated flow field near the orifices is not fully understood nor completely modeled by the theory. Suggestions for possible improvements to the impedance model are discussed.
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