Abstract
An experiment to assess mode scattering in lined circular ducts with peripheral segmentation was conducted. This work is a first attempt to experimentally quantify scattering effects for peripherally segmented liners in a laboratory environment. Mode insertion losses were measured for a six segment, two segment, and uniformly lined duct in the Langley Spinning Mode Synthesizer. Selected spinning modes generated in the synthesizer hardwall source section were allowed to propagate through the lined section into a hardwall duct section with anechoic termination. Estimated mode insertion losses were obtained from a comparison of transmitted mode amplitudes for the various test liners with those for a hardwall duct configuration. Significant mode scattering was predicted and measured for the two segment liner for incident spinning mode orders of 1 and 3. For spinning mode order 1, scattering into spinning mode order 2 was observed. For incident spinning mode order 3, scattering into spinning mode order 4 was o...
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