本文選題：渦激振動　切入點(diǎn)：質(zhì)量阻尼比　出處：《哈爾濱工業(yè)大學(xué)學(xué)報》2017年01期 　論文類型：期刊論文

【摘要】：為研究完全湍流剪切層(2×10~4~4×10~4Re1×10~5~2×10~5)下雷諾數(shù)對渦激振動動態(tài)響應(yīng)的影響,在OpenFOAM平臺下采用有限體積法求解雷諾平均Navier-Stokes方程和Spalart-Allmaras一方程湍流模型,采用二階范德波爾方程描述二維圓柱體渦激振動,對完全湍流剪切層下的圓柱繞流渦激振動進(jìn)行數(shù)值計算,分析渦激振動的振幅、頻率特性,并在Williamson-Roshko(W-R)圖譜中分析旋渦尾跡脫落模式.結(jié)果表明:在相同折減速度下提升雷諾數(shù)時,圓柱振幅會顯著增大,最大振動振幅值高于自由剪切層過渡旋渦區(qū)結(jié)果及修正Griffin圖譜結(jié)果.雷諾數(shù)對提高圓柱的渦激振動振幅和同步區(qū)的范圍具有決定性作用,在完全湍流剪切層中,當(dāng)提升阻尼參數(shù)(α≥0.38)時,渦激振動的上部分支消失,振動頻率出現(xiàn)"階躍".
[Abstract]:In order to study the effect of Reynolds number on the dynamic response of vortex-induced vibration in a completely turbulent shear layer of 2 脳 10 ~ (4) Re1 脳 10 ~ (5) Re2 脳 10 ~ (5), the Reynolds mean Navier-Stokes equation and the turbulent model of Spalart-Allmaras _ (-) equation are solved by finite volume method on the OpenFOAM platform. The second order Van der Bohr equation is used to describe the vortex-induced vibration of a two-dimensional cylindrical body. The vortex-induced vibration around a cylinder in a completely turbulent shear layer is numerically calculated, and the amplitude and frequency characteristics of the vortex-induced vibration are analyzed. The vortex wake shedding model is analyzed in the Williamson-Roshkoo W-R) atlas. The results show that the amplitude of the cylinder increases significantly when the Reynolds number is raised at the same reduction speed. The maximum vibration amplitude is higher than that of the free shear layer transition vortex region and the modified Griffin diagram. Reynolds number plays a decisive role in increasing the amplitude of vortex-induced vibration and the range of the synchronous region of the cylinder, and in the completely turbulent shear layer, the maximum vibration amplitude is higher than that in the free shear layer. When the lifting damping parameter (偽 鈮，

本文編號：1634647