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This paper is concerned with the stability of a two-dimensional laminer wake. The development of small disturbances excited artificially is investigated both experimentally and theoretically. Experiments are made in an experimental water-tank at Reynolds numbers between 10 and 600 for a flat plate and between 0.8 and 60 for a circular cylinder. The amplification rate, the wave length and the wave velocity of the disturbance are measured from the photographs of the flow. The neutral stability curve is determined both for the fiat plate and for the circular cylinder. The minimum critical Reynolds number below which all disturbances are damped is found to be about 1.0 for the circular cylinder. Theoretical investigations are made by the method of small oscillations. The agreement between the theory and the experiment is fairly good.
Sadatoshi Taneda (1963) studied this question.