CFD-半解析模型混合的管束结构流弹失稳预测方法

横向流作用下管束结构传统流弹失稳模型的建立或多或少需要获取实验流体力参数作为输入条件.因此非常需要开发一种不依赖实验数据的管束结构流弹失稳模型.该文提出了一种改进的CFD仿真与半解析方法混合的管束结构流弹失稳预测方法.采用CFD仿真方法获取半解析模型中关键的相位延迟函数，并根据速度将其表示为简单的分段函数.最终预测了横向流作用下间距比为1.375的平行三角形与正三角形管束结构的流弹失稳阈值，预测结果与文献中的实验结果吻合良好.该文提出的CFD 半解析模型混合方法同样适用于其他管束结构的流弹失稳预测，为蒸汽发生器传热管流弹失稳现象的研究提供了一种时间成本较低的预测方法.

A Hybrid CFD and Semi-Analytical Approach to Predict Cross-Flow-Induced Fluidelastic Instability of Tube Arrays

Conventional theoretical models for fluidelastic instability analysis of a tube bundle subjected to cross flow require more or less experimental fluid force data as input. It is highly desirable to develop models independent of experimental data. An improved hybrid strategy was proposed through combination of the CFD simulation and the semi-analytical approach to predict fluidelastic instability of tube arrays. The key phase lag function in the semi-analytical model was extracted from the CFD simulation, and expressed as simple piecewise functions according to velocities. The cross-flow-induced fluidelastic instability thresholds of both parallel and equilateral triangular tube arrays with a pitch-to-diameter ratio of 1.375 were obtained and good agreement was achieved in comparison with experimental results. The developed approach can be used for fluidelastic instability analysis of other tube configurations, making a useful prediction tool dramatically saving time and cost.