基于激光诱导荧光法的空泡份额测量

摘要

The laser induced fluorescence method,as a new technique in the field of visualization experiment field,has received more and more attention to the nuclear reac-tor thermal-hydraulic research.The laser induced fluorescence method was applied in the measurement of void fraction of gas-liquid two-phase flow.The principle of the void fraction measurement based on laser induced fluorescence method was introduced,and the detail procedure of this measurement technique was described,then the method of picture image data processing was presented to get the void fraction information.An experimental investigation based on planar laser induced fluorescence was conducted to measure the void fraction in vertical rectangular pipe.By comparing the void fraction measured by the laser induced fluorescence method with the theoretical analysis result, it is found that the void fraction fits well with the predicted value.Therefore,the laser induced fluorescence method can be well applied in the continuous measurement of void fraction,with which the flow field will not be disturbed.%激光诱导荧光技术作为可视化实验领域中的新技术，在核反应堆热工水力研究中得到了越来越广泛的运用。将激光诱导荧光技术应用于气液两相流空泡份额的测量中，介绍了激光诱导荧光法测量空泡份额的原理，描述了激光诱导荧光法测量空泡份额的具体实施方法，说明了图像数据的处理方法，并将该测量空泡份额方法用于气液两相流实验测量研究，在不同工况下进行了竖直通道内两相流空泡份额测量实验。实验结果表明，利用激光诱导荧光技术测得的空泡份额与理论预测结果符合较好。运用该方法能对流场内的空泡份额分布进行连续测量，且不会对流场造成干扰。