不同排列小间距双方柱涡激振动数值模拟研究  

Numerical simulation on vortex-induced vibration of two square cylinders with small spacing in different arrangement

作　　者：邬益东 李海泉 王晓欣[1] 史力[1] 吴莘馨[1] WU Yi-dong;LI Hai-quan;WANG Xiao-xin;SHI Li;WU Xin-xin(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;Huaneng Shangdong Shidao Bay Nuclear Power Co.,Ltd.,Weihai 264312,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]华能山东石岛湾核电有限公司,山东威海264312

出　　处：《振动工程学报》2023年第2期334-344,共11页Journal of Vibration Engineering

基　　金：国家科技重大专项资助项目(ZX06901)。

摘　　要：为研究不同排列下小间距双方柱涡激振动特性及其振动机理,在雷诺数为100时,对间距比为2、质量比为3的串列、错列和并列排列双方柱涡激振动进行数值模拟研究,分析了双柱在折合流速U_(r)=1~30下的响应振幅及频率特性,并得到振动柱体的升阻力系数,以了解其气动力系数的变化情况,探讨了不同排列下双柱尾流结构的变化情况。结果表明:串列及错列排列中,下游柱涡激振动振幅远大于单柱,上游柱振动受到抑制(θ=60°的双方柱排列情况除外)。并列排列中,双柱振动曲线几乎一致,其涡激振动振幅比单柱稍大。各排列双柱均发生尾流驰振现象,使其在U_(r)超出共振区时仍保持较高的振幅。不同排列的双柱阻力系数C_(D)(θ=30°的双柱排列下游柱除外)均在共振区内突增,在共振区外保持不变。在共振区内,双柱C_(Lrms)随U_(r)的变化情况与A*的大小有关;在其余U_(r)范围内,双柱C_(Lrms)基本不变。串列双柱存在3种尾流模式,θ=30°双柱排列的尾流模式与串列双柱相似,但在超出共振区时,其尾流呈现无序状态。在θ=60°,90°双柱排列中,当U_(r)较大时,双柱尾涡结构呈现混乱的状态;当U_(r)较高时,柱体各自独立脱落旋涡。In order to investigate the vortex-induced vibration characteristics and vibration mechanism of two square cylinders with small spacing in different arrangements,numerical simulation on vortex-induced vibration of two square cylinders in tandem,paral⁃lel,staggered arrangement is carried out at Reynolds number Re=100 with the spacing ratio of 2 and the mass ratio of 3.The am⁃plitude and frequency of vortex-induced vibration(VIV)response of two square cylinder at U_(r)=1-30 is studied and the lift and drag coefficient are obtained to understand the characteristic of the aerodynamic coefficient.The wake structures of two square cyl⁃inders in different arrangements are analyzed.The results show that the vibration amplitude of downstream cylinder in tandem,stag⁃gered arrangement is much larger than that of single square cylinder while the vibration of upstream cylinder is suppressed(except the case ofθ=60°).The amplitude curves of two cylinders in parallel arrangement are almost identical,with the vibration ampli⁃tude larger than that of single square cylinder.The wake galloping phenomenon of two cylinders is observed in all arrangement,which make the cylinders maintain a lager amplitude as U_(r) exceeds the resonance range.The C_(D) of two cylinders in different ar⁃rangement abruptly increases in the resonance range and keeps constant beyond the resonance range(except the C_(D) of downstream cylinder atθ=30°).In the resonance U_(r) range,the variations of C_(Lrms) with U_(r) of two cylinders are related to the A*while that keeps constant beyond the resonance range.There are three wake mode of two square cylinders in tandem arrangement.The wake structure of cylinders atθ=30°is similar to that of cylinders in tandem,while it is in a state of chaos beyond the resonance range.Asθ=60°and 90°,the shear layer of two square cylinders sheds disorderly at lower U_(r) while the vortex sheds individually from each cylinder at higher U_(r).

关 键 词：涡激振动 双方柱 串列 错列 并列 

分 类 号：O351.2[理学—流体力学] TU311.3[理学—力学]