Experimental Study on the Effect of Secondary Vortices at the Trailing Edge on Motion-Induced Vortex Vibration
According to the results of conventional wind tunnel tests on rectangular cross sections with side ratios of B/D = 2–8 (B: along-wind length (m), D: cross-wind length (m)), motion-induced vortex vibration was confirmed. The generation of motion-induced vortex vibration is considered to be caused by the unification of separated vortices from the leading edge and secondary vortices at the trailing edge. Spring-supported tests and smoke flow visualization tests for B/D = 0.62, 0.75, 1.0, 1.18 and 1.50 were conducted in a wind tunnel at Kyushu Institute of Technology. As a result, it was considered that the secondary vortices at the trailing edge are not always essential for the generation of the motion-induced vortex vibration in heaving motion of each cross section. In this study, smoke flow visualizations were performed for side ratios of B/D = 2.0, 4.0, 6.0 in order to elucidate the role of secondary vortices at the trailing edge in motion-induced vortex vibration in heaving motion. Spring-supported tests were also carried out in order to obtain the response characteristics of the models.
KeywordsMotion-induced vortex vibration Smoke flow visualizations Spring-supported tests Rectangular cross sections Side ratios
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