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INVESTIGATIONS OF IN-PLANE FLUIDELASTIC INSTABILITY IN A MULTI-SPAN U-BEND TUBE BUNDLE - TESTS IN AIR FLOW

机译:多段U形弯管束中平面内流体弹塑性不稳定性的研究

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The tubes in the U-bend region of a recirculating type of nuclear steam generator are subjected to cross-flow of a two-phase mixture of steam and water. There is a concern that these tubes may experience flow-induced vibration, including the damaging effects of fluidelastic instability. This paper presents an update and results from a series of flow-induced vibration experiments performed by Canadian Nuclear Laboratories for the Electric Power Research Institute (EPRI) using the Multi-Span U-Bend test rig. In the present experiments, the main focus was to investigate fluidelastic instability of the U-tubes subjected to a cross-flow of air. The tube bundle is made of 22 U-tubes of 0.5 in (12.7 mm) diameter, arranged in a rotated triangular configuration with a pitch-over-diameter ratio of 1.5. The test rig could be equipped with variable clearance flat bar supports at two different locations to investigate a variety of tube and support configurations. The primary purpose of the overall project is to study the effect of flat bar supports on 'in plane' ('streamwise') instability in a U-tube bundle with realistic tube-to-support clearances or preloads, and eventually in two-phase flow conditions. Initially, the test rig was designed for tests in air-flow using an industrial air blower. Tests with two-phase Freon refrigerant (R-134a) will follow. This paper describes the test rig, experimental setup, and the challenges presented by simulating an accurate representation of current steam generator designs. Results from the first series of tests in air flow are described.
机译:循环型核蒸汽发生器的U形弯曲区域中的管子受到蒸汽和水的两相混合物的交叉流的作用。令人担忧的是,这些管可能会受到流动引起的振动,包括流体弹性不稳定性的破坏作用。本文提供了更新和结果,这些结果是加拿大核实验室针对电力研究所(EPRI)使用多跨度U形弯折试验台进行的一系列流动引起的振动实验的结果。在目前的实验中,主要的焦点是研究承受空气横流的U型管的流体弹性不稳定性。管束由22根直径为0.5英寸(12.7毫米)的U型管制成,以旋转的三角形结构排列,螺距与直径之比为1.5。该试验台可以在两个不同的位置配备可变间隙扁钢支架,以研究各种管子和支架的配置。整个项目的主要目的是研究具有实际管到支撑间隙或预紧力的U型管束中扁棒支撑对“平面内”(“沿流向”)不稳定性的影响,最终分为两阶段流动条件。最初,该试验台被设计用于使用工业鼓风机对气流进行测试。随后将进行两相氟利昂制冷剂(R-134a)的测试。本文描述了测试设备,实验装置以及通过模拟当前蒸汽发生器设计的精确表示所带来的挑战。描述了第一批气流测试的结果。

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