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An experimental investigation of subcooled choked flow in actual steam generator tube cracks

机译:实际蒸汽发生管裂纹中过冷cool流的实验研究

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The work presented here is an experimental investigation of the two-phase choked flow of initially subcooled water through a stress corrosion crack on the steam generator tube. The study was designed to provide an extensive experimental data set for predicting leak flow rates of nuclear reactor coolant using actual tube steam generator tubes sample. Five samples of steam generator tubes with stress corrosion axial cracks taken from steam generators of the US pressurized water reactor and Canadian pressurized heavy water reactor (CANDU) were used in this study. Wall thicknesses of the samples vary from 1.1 mm to 1.3 mm with the crack channel length to hydraulic dimeter ratios from 3 to 15. The experiment was carried out for various stagnation pressures up to 6.89 MPa and liquid subcoolings ranging from 5 degrees C to 70 degrees C. Parametric dependence of choked flow rate on stagnation pressure, crack channel length to hydraulic diameter ratio, and degree of liquid subcooling was demonstrated for different crack geometries. All the parameters are shown to have significant effects on the choking mass flux. The experimental results indicate that the channel length strongly affects the choking mass flux as well as the correlation between this parameter and the stagnation pressure. These data are unique as they were obtained with actual steam generator tube cracks and hence are advantageous in understanding the choked flow in the very short channel length channel and similar flow geometries.
机译:此处介绍的工作是对最初过冷的水通过蒸汽发生器管上的应力腐蚀裂纹进行的两相节流的实验研究。该研究旨在提供广泛的实验数据集,以使用实际的管道蒸汽发生器管道样本预测核反应堆冷却剂的泄漏流速。本研究使用了五个压力发生器轴向应力开裂的蒸汽发生器管样品,这些样品取自美国压水堆和加拿大压重水堆(CANDU)的蒸汽发生器。样品的壁厚从1.1毫米到1.3毫米不等,裂缝通道的长度与水力直径比为3到15。该实验是针对高达6.89 MPa的各种滞止压力和5摄氏度至70摄氏度的液体过冷进行的C.在不同的裂纹几何形状下,节流流量对停滞压力,裂纹通道长度与水力直径比以及液体过冷度的参数相关性得到了证明。所有参数均显示对阻气质量通量有显着影响。实验结果表明,通道长度强烈影响阻气质量通量以及该参数与停滞压力之间的相关性。这些数据是独特的,因为它们是通过实际的蒸汽发生器管破裂获得的,因此有利于了解非常短的通道长度通道和类似的流动几何形状中的阻塞流。

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