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A normal multimode decomposition method for stability experiments

机译：A normal multimode decomposition method for stability experiments

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摘要

A method for decomposition of an experimental signal that contains several normal modes with a prescribed frequency, is proposed. The method is based on an expansion of solutions for small‐amplitude spatially growing disturbances in a biorthogonal eigenfunction system. It is shown that data of one velocity component at a given cross‐stream section of the flow are in some cases, sufficient for the decomposition. The method is applied successfully to analyze small‐amplitude periodic disturbances in a transitional wall‐jet flow. ©1996 American Institute of Physics.

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