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首页> 外文学位 >EXPERIMENTAL STUDY OF AXIAL FLOW IN A FINITE ARRAY OF RODS AND THE APPLICATION OF FINITE ELEMENT TECHNIQUES TO FLOW IN DUCTS AND ROD BUNDLES.
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EXPERIMENTAL STUDY OF AXIAL FLOW IN A FINITE ARRAY OF RODS AND THE APPLICATION OF FINITE ELEMENT TECHNIQUES TO FLOW IN DUCTS AND ROD BUNDLES.

机译：有限杆中轴流的实验研究以及有限元技术在导管和杆束中流动的应用。

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摘要

Experimental measurements of the wall shear stress, axial velocity, axial turbulence intensity and turbulence power spectra were made for axial turbulent flow along a rectangular 3 x 6 array of rods with a pitch to diameter ratio = 4/3.; Wall shear stress measurements were performed on six rods and on two side walls using hot film probes. Measurements of the axial velocity, axial turbulence intensity and the turbulence spectra were performed in the corner, wall and central subchannels of the array using hot wire probes.; The results show that the local shear stress maxima occur near the largest flow areas. The ratio of the maximum to the minimum shear stress on an individual rod is largest for the corner rod. Side wall maximum local shear stress occurs in the first wall-subchannel. Overall friction factors calculated from the wall shear stress measurements agree with those calculated from pressure drop data.; Measured axial velocity and axial turbulence intensity distributions agree with available experimental and analytical results. Secondary flow effects on these distributions and on the wall shear stress distribution are more pronounced in the corner and the adjacent subchannels than in the central subchannels.; An analytical study of turbulent flow in rod bundle subchannels was carried out using the finite element method. The computational scheme used in the analysis employed the Galerkin weighted residual method and the model of turbulence proposed by Roco and Zarea (1976).; The applicability of the computational scheme to flow in subchannels of square and triangular rod arrays was investigated at different values of pitch to diameter ratio and Reynolds number. The results indicate the correct qualitative trends of the axial velocity and shear stress distributions. Differences between the calculations and the available experimental results were caused by secondary flows, which were neglected in the analysis.; The present computational scheme has displayed a great range of applicability to flows in complex geometries. However, detailed information on some of the parameters used in the turbulence model is necessary to obtain better agreement between the predictions and reliable experimental results.
机译：沿壁长×直径比＝ 4/3的矩形3×6棒阵列的轴向湍流，进行了壁切应力，轴向速度，轴向湍流强度和湍流功率谱的实验测量。使用热膜探针在六个杆和两个侧壁上进行壁切应力测量。使用热线探针在阵列的角，壁和中心子通道中进行轴向速度，轴向湍流强度和湍流谱的测量。结果表明，局部切应力最大值出现在最大流量区域附近。对于角杆，单个杆上的最大剪应力与最小剪应力之比最大。侧壁最大局部剪应力出现在第一壁子通道中。从壁切应力测量结果计算出的总摩擦系数与从压降数据计算出的摩擦系数一致。测得的轴向速度和轴向湍流强度分布与可用的实验和分析结果一致。次要流动对这些分布和壁面剪应力分布的影响在角部和相邻子通道中比在中央子通道中更为明显。使用有限元方法对杆束子通道中的湍流进行了分析研究。分析中使用的计算方案采用Galerkin加权残差法和Roco和Zarea（1976）提出的湍流模型。在螺距与直径比和雷诺数不同的情况下，研究了该计算方案在正方形和三角形杆阵列子通道中流动的适用性。结果表明了轴向速度和切应力分布的正确的定性趋势。计算与可用的实验结果之间的差异是由二次流引起的，而二次流在分析中被忽略了。当前的计算方案已经显示出对复杂几何形状中的流的广泛适用性。但是，在湍流模型中使用的一些参数的详细信息对于获得预测结果与可靠的实验结果之间的更好一致性是必要的。

著录项

  • 作者

    ABDELGHANY, MOHAMED MAHMOUD.;

  • 作者单位

    University of Kentucky.;

  • 授予单位 University of Kentucky.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1982
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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