Study on Fundamental Mechanical Problems in Fluidelastic Instability of Steam Generator Heat Transfer Tube Bundles
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摘要: 为探讨管束的流弹失稳机理以及支承方式、内流载荷对流弹失稳的影响机制，本文综合考虑定常流弹力、内流激励和非定常流体力对传热管流致振动的影响，建立了复杂流体激励作用下传热管流致振动的理论模型，通过特征值稳定性理论获得了两相横流作用下的传热管流弹失稳机制，系统地分析了内流激励和非定常流体力对传热管流弹失稳机制的影响。研究表明，支承方式会影响失稳临界流速，但不会影响流弹失稳机制；管内流会使管束各阶模态耦合，高速内流会改变管束的失稳机制；非定常流体力作为一种强迫力在流弹失稳之前，可能引起管束的“拍振”现象，在工程设计时应考虑避免。Abstract: In order to explore the mechanism of the fluidelastic instability of the tube bundle and the influence mechanism of the support mode and the internal flow load on the fluidelastic instability of the tube bundle, a theoretical model of the flow induced vibration of the heat transfer tube under complex fluid excitation is established by comprehensively considering the effects of the steady flow elasticity, internal flow excitation and unsteady flow force on the flow induced vibration of the heat transfer tube. Based on the eigenvalue stability theory, the fluidelastic instability mechanism of heat transfer tube under the action of two-phase cross-flow is obtained, and the effects of internal flow excitation and unsteady flow force on the fluidelastic instability mechanism of heat transfer tube are analyzed systematically. The research shows that the support mode will affect the critical velocity of instability, but will not affect the fluidelastic instability mechanism; the internal flow in the tube will couple the modes of the tube bundle, and the high-speed internal flow will change the instability mechanism of the tube bundle; As a kind of forced force, the unsteady flow force may cause the "beating vibration" of the tube bundle before the fluidelastic instability, which shall be avoided in the engineering design.
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图 3 不同支承形式与失稳机制的关系
Figure 3. Relationship between Different Support Modes and Instability Mechanism
图 4 数值解与理论解的对比
Figure 4. Comparison between Numerical Solution and Theoretical Solution
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