串列圆柱体尾流、尾涡耦合振动试验研究

Experimental investigation of wake flow and wave-vortex coupled vibration of two tandem and cylinders

基于模型试验方法设计的试验装置能抑制上游立管涡旋产生,研究不同工况时上游立管对下游立管影响。分别对上游立管部产生涡激振动与产生涡激振动两种试验模型进行不同流速、不同间距条件的流致振动试验,通过观察涡旋脱落、测量模型振动分析上游立管有无抑涡设备及上游立管对下游立管横向振动影响。研究表明,上游立管对下游立管振动产生影响,不同于孤立单管。上游无抑涡设备时下游立管的横向振动随立管间距先增大后减小;有抑涡设备时上游立管横向振动在某倍管径后稳定在某定值基本不变。

In order to analyse the upstream riser＆#39;s effect on downstream riser under different working conditions by model testing,a device which can inhibit the upstream vortex was designed.The experiments focus on the vortex-induced vibration of isolated upstream riser and were carried out with a variety of improved equipments under different flow rate and different spacing conditions.The impact of upstream riser on downstream riser was analysed by observing vortex shedding and measuring model vibration under the conditions of with or without inhibit vortex devices.It is concluded that the vibration state of downstream riser is different from that of isolated standpipe under the influence of upstream standpipe. The lateral vibration of downstream riser without inhibit device first increases and then decreases along with the increase of tube spacing,while it becomes stable beyond some limit of the increase of tube diameter under the condition of installing inhibit devices.