Theoretical and numerical study on flow-induced vibration of exhaust tower in a cryogenic wind tunnel
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摘要:
为分析排气塔在自然风载和内流共同作用下的结构安全性,采用理论和数值模拟方法分析了排气塔的流致振动响应情况。理论分析获得了排气塔在自然风载作用下的顺流响应和均值响应。采用计算流体力学方法,shear stress transport (SST)
k -ω 湍流模型和动网格数值技术实现了排气塔的双向流固耦合数值模拟,获得了排气塔在内外流动混合作用下的速度、压力和涡量分布。表明排气塔在特定风载下的旋涡脱落频率接近1阶模态频率,塔体应力较小,在许用应力范围内。Abstract:The flow-induced vibration response of the exhaust tower was analyzed by theoretical and numerical simulation methods to investigate the structural safety of the exhaust tower under the combined action of natural wind load and internal flow. The exhaust tower’s co-current response and mean response under the action of wild wind load were achieved. Then, using the computational fluid dynamics approach, shear stress transport
( SST)k -ω turbulence model and dynamic mesh numerical technology, the exhaust tower’s two-way fluid-structure interaction numerical simulation was realized. The exhaust tower’s velocity, pressure, and vorticity distribution under the action of internal and external flow mixing were also obtained. The vortex shedding frequency of the exhaust tower under a specific wind load was close to the first-order modal frequency of the structure. The gained stress was within the allowable stress range of stainless steel.-
Key words:
- exhaust tower /
- flow-induced vibration /
- cryogenic wind tunnel /
- vortex /
- fluid-structure interaction
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表 1 排气塔振动模态频率
Table 1. Vibration modal frequency of exhaust tower
模态 频率/Hz 模态 频率/Hz 1 1.9587 4 12.027 2 1.9684 5 15.270 3 11.999 6 16.057 -
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