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为了测量核蒸汽发生器模拟体的汽液两相流空泡率和流型,采用国产两相流空泡率光纤探头于小型氟利昂两相流台架。光纤探头信号被动态采集并转换为数字形式。同时对信号的电平时序,电平概率密度函数和傅里叶谱函数进行了分析。汽液过渡的阈值由冷态压降试验确定。空泡率由单阈值方法确定,并与传热数值计算结果进行了比较。流型由上述时序和函数的特征图形确定,并经过目视观察记录证实。试验表明,光纤技术可以应用于两相流的流型和空泡份额测量。
In order to measure the cavitation rate and flow pattern of the vapor-liquid two-phase flow in the simulator of nuclear steam generator, a two-phase flow-rate fiber probe made in China was used in a small freon two-phase flow stage. Fiber probe signals are dynamically acquired and converted to digital form. At the same time, the signal level timing, level probability density function and Fourier spectrum function were analyzed. The threshold for the vapor-liquid transition is determined by the cold pressure drop test. The bubble rate was determined by the single-threshold method and compared with the numerical results of heat transfer. The flow pattern is determined by the pattern of the above timing and function, and confirmed by visual observation. Experiments show that optical fiber technology can be applied to the two-phase flow pattern and volume fraction measurement.