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The simulaneous measurement of the velocities at two points with X-type hot wire probes has been performed in three different downstream regions of a plane jet (i.e., the potential core region, the interaction region and the self-preserving region). Mainly by the combined analysis of KL expansion and Fourier transform, the structure development of the plane jet is investigated from a viewpoint of both space and frequency. From the downstream variation of the eigenfunctions, it is found that in the early stage of the interaction region the profiles of the 1st u- and v-POD mode in the low frequency range become self-similar, but in high frequency range these continue to change until the self-preserving region. The characteristics of coherent structure can be extracted efficiently by the spatial correlation profiles reconstructed from the 1st POD mode.

nihon kikai gakkai ronbunshū. b

An Experimental Study on the Development of Coherent Structure in a Plane Jet (2nd Report, Spatio-temporal Velocity Structure by the Combined Analysis of KL Expnasion and Fourier Transform)