论文部分内容阅读
针对串列双矩形断面涡激振动气动干扰问题,在均匀流场下,分别对不同间距比D/B、不同阻尼比条件下上、下游矩形断面涡激振动气动干扰效应进行了风洞试验研究,并将上、下游矩形断面涡激振动锁定区间、涡激共振振幅与单矩形断面进行了对比。结果表明:串列双矩形断面竖向涡激振动锁定区间、上游矩形断面扭转涡激振动锁定区间不因上、下游矩形断面间距比及阻尼比的影响而改变,下游矩形断面扭转涡激振动锁定区间随上、下游矩形断面间距比的变化而略有变化;上、下游矩形断面净间距和阻尼比对上、下游矩形断面竖向涡激及扭转涡激共振振幅有影响;对于上游矩形断面竖向和扭转涡激振动,D/B=0.5时干扰效应达到最大,D/B≥4时气动干扰效应可以忽略;而对于下游矩形断面的竖向和扭转涡激振动,D/B=0.5时干扰效应达到最大,D/B≥7时仍存在气动干扰效应,且表现为抑制作用。
Aiming at the aerodynamic interference problem of vortex-induced vibration in tandem double rectangular section, the wind tunnel test on the vortex-induced aerodynamic interference of the rectangular cross-section under D / B and Damping ratio with different pitch ratio is carried out under uniform flow field , And compared the vortex-induced vibration locking interval and the amplitude of vortex-induced resonance with the single rectangular cross-section of the upper and lower rectangular sections. The results show that the vertical vortex-induced vibration locking interval of double-rectangular cross-section and the torsional vortex-induced vibration locking interval of the upstream rectangular cross-section do not change due to the influence of the ratio of the upper and lower rectangular cross-sections and the damping ratio. The interval varies slightly with the ratio of the upper and lower rectangular cross sections. The net spacing and damping ratio of the upper and lower rectangular sections have an influence on the vertical vortex and the reversed vortex vibration amplitude of the upper and lower rectangular sections. For the upper rectangular section Vortex vibration is induced and reversed. When D / B = 0.5, the disturbance effect reaches the maximum, and the aerodynamic interference effect can be ignored when D / B≥4. For the vertical and torsional vortex induced vibration of the downstream rectangular section, D / B = 0.5 The interference effect reaches the maximum. When D / B≥7, the aerodynamic interference effect still exists, and the inhibition effect appears.