Abstract
The possibility of constructing acoustic linings for noise control by making use of the nonlinear resistance of orifices offers great promise in terms of durability and economy of construction. Such devices are particularly attractive for application in the inlet ducts of turbomachinery, where both flow velocities and sound pressure levels are generally quite high. An investigation is reported of the sensitivity of orifice impedance to adjacent orifices or walls and to tangential flow at various sound pressure levels. The sensitivity of orifice impedance to adjacent orifices or walls was found to be very much less than the sensitivity to tangential flow even for relatively modest air flow speeds. These results imply that flow effects may dominate the absorption characteristics of nonlinear orifices in ducts. [This work was sponsored by the Aircraft Division, Douglas Aircraft Company, McDonnell Douglas Corporation, Long Beach, California.]
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