Pressure Fluctuation Characteristics of Complex Turbulent Flow in a Single Elbow With Small Curvature Radius for a Sodium-Cooled Fast Reactor
Pressure Fluctuation Characteristics of Complex Turbulent Flow in a Single Elbow With Small Curvature Radius for a Sodium-Cooled Fast Reactor
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钠冷快堆小曲率半径单弯管内复杂湍流压力脉动特性
DOI：
10.1115/1.4002813
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发表时间：
2010
影响因子：
2
通讯作者：
H. Yamano
中科院分区：
文献类型：
--
作者：
S. Ebara;Yuta Aoya;Tsukasa Sato;H. Hashizume;Yuki Kazuhisa;K. Aizawa;H. Yamano
日本钠冷快堆（JSFR）冷段采用多弯头管道系统。流致振动（FIV）被认为是由于管道中雷诺数非常高的复杂湍流而出现的。在这项研究中，对单个弯头流量进行压力测量，以阐明源自弯头湍流运动的压力波动特征，这可能导致 FIV。通过实验测试两种不同比例的模型（1/7 比例和 1/14 比例）模拟 JSFR 冷管段管道，以确认压力波动特性是否存在比例效应。在两个缩放模型的流动分离区域及其下游获得的压力波动的每个功率谱密度（PSD）轮廓中可以看到明显的峰值。当无量纲化时，无论比例模型如何，甚至本研究中模拟的雷诺数如何，PSD 剖面都显示出良好的对应性。
A multi-elbow piping system is adopted for the Japan sodium-cooled fast reactor (JSFR) cold-legs. Flow-induced vibration (FIV) is considered to appear due to complex turbulent flow with very high Reynolds number in the piping. In this study pressure measurement for a single elbow flow is conducted to elucidate pressure fluctuation characteristics originated from turbulent motion in the elbow, which lead potentially to the FIV. Two different scale models, 1/7- and 1/14-scale simulating the JSFR cold-leg piping, are tested experimentally to confirm whether a scale effect in pressure fluctuation characteristics exists. A distinguishing peak can be seen in each power spectrum density (PSD) profile of pressure fluctuation obtained in and downstream of the flow separation region for both scaled models. When nondimensionalized, the PSD profiles show good correspondence regardless of scale model and even of Reynolds number simulated in this study.