Study on Vortex-induced Vibration Characteristics and Mechanisms of Tandem Double Rectangular Cross-sections
In order to study vortex-induced vibration characteristics and the occurrence mechanism of tandem double rectangular cross-sections,synchronous vibration and pressure wind tunnel test method was adopted by a rigid mode to test and analyze the vortex-induced vibration response and surface wind pressure distribution characteristics of tandem double rectangular cross-sections with a width to thickness ratio of 4∶1 at different spacing.Meanwhile,the experimental results of a single rectangular cross-section were compared to analyze the differences between the two sections.When the variation range of the spacing ratio D/B(the ratio of the net spacing of a double rectangular section to the width of a single rectangular section)is 0.1 to 6.0,the test was carried out.The research results indicate that the vortex-induced vibration response of the windward side section is significantly enhanced,while the one of the leeward side section is significantly suppressed due to the obvious vortex-induced vibration characteristics between the tandem double rectangular cross-sections;When D/B=0.4,the vortex-induced vibration of the windward side section is most obvious with the maximum amplitude of 1.7 times and a vortex-induced vibration interval length of 1.2 times that of a single rectangular section;When D!B=0.4,surface pressure pulsation is most significant in the leeward area of the windward section,which causes an enhanced correlation between local aerodynamic forces and overall aerodynamic forces,resulting in the maximum amplitude of vortices.
tandem double rectangular cross-sectionsmodel testspacing rationvortex-induced vibration char-acteristicsvortex-induced vibration mechanism
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