【24h】

THE EFFECTS OF TUBE ARRAY GEOMETRY ON FLUIDELASTIC INSTABILITY IN HEAT EXCHANGER TUBE ARRAYS IN CROSS FLOW

机译:管子几何形状对横流换热器管子中流体弹塑性不稳定性的影响

获取原文

摘要

The shut-down of the San Onofre Nuclear Generating Station (SONGS) has been attributed to damaging streamwise Fluidelastic Instability (FEI) of the steam generator tubes, a phenomenon which has traditionally been assumed not to occur. This has generated a significant research effort to better understand this phenomenon and to develop appropriate design criteria for its prevention. Most current design codes are based on Connors criterion for FEI which neglects both streamwise FEI and the effects of tube array pattern and pitch ratio. It is becoming clear that array geometry and pitch ratio are important determining factors in FEI, especially in the streamwise direction. This paper presents an extension of the theory of Lever and Weaver to consider arrays of flexible fluid-coupled tubes which are free to become unstable in both the transverse and streamwise directions. This simplified modelling approach has the advantages of being very tractable for numerical parametric studies and having no need for experimental data input. Previous research by the authors has shown that the predictions of this model agree very well with the available experiments for parallel triangular arrays for both transverse and streamwise FEI. In this paper, the results of such studies are presented for the both transverse and streamwise FEI for square inline and normal triangular arrays and compared with the authors' previous results for parallel triangular arrays. It is shown that FEI is strongly influenced by array geometry, especially for small pitch ratio arrays operating at low values of the mass damping parameter. The results show good agreement with the available experimental data.
机译:San Onofre核电站(SONGS)的关闭归因于蒸汽发生器管道的流向流弹性不稳定性(FEI)的破坏,传统上认为这种现象不会发生。这已经产生了巨大的研究成果,以更好地理解这种现象并制定适当的设计标准来进行预防。当前大多数设计规范都基于Connors FEI准则,该准则忽略了沿流FEI以及管阵列图案和螺距比的影响。显然,阵列的几何形状和螺距比是FEI的重要决定因素,尤其是在流向中。本文介绍了Lever和Weaver理论的扩展,以考虑柔性流体耦合管的阵列,这些挠性流体耦合管在横向和流向都可以自由地变得不稳定。这种简化的建模方法具有以下优点:对于数值参数研究非常易于处理,并且不需要实验数据输入。作者先前的研究表明,该模型的预测与横向和流向FEI的平行三角形阵列的可用实验非常吻合。在本文中,针对方形串联和法向三角形阵列的横向和沿流FEI均给出了此类研究的结果,并将其与作者先前针对平行三角形阵列的结果进行了比较。结果表明,FEI受到阵列几何形状的强烈影响,尤其是对于在质量阻尼参数值较低的情况下运行的小节距比阵列而言。结果表明与现有的实验数据吻合良好。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

联系方式:18141920177 (微信同号)

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号