長方形噴流の発振と圧力フィードバック

概要

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The self-excited oscillation of a rectangular jet impinging on an edge is investigated experimentally. Cross-correlation functions between the pressure of fluctuation of the edge and those of measured points in the nozzle-edge span are calculated. Contour lines of cross-correlations and phase differences are depicted. Peaks from the edge to the nozzle exit are found in those contour lines; a connecting line with these peaks is assumed as a main path of feedback. The phase lags a bit and is positive. This suggests that the oscillation occurs by the positive feedback of the pressure fluctuation at the proximity of the edge to the nozzle exit. Furthermore, the existence of the feedback path is made visible by three-dimensional graphics of cross-correlation functions. It seems that there is a relation between the cross-correlation and the maximum magnitude of the pressure fluctuation.
一般社団法人日本機械学会の論文
1989-05-25