基于线列阵传感器的射流冲击试验含气率分布研究

射流冲击是一种气-液两相流现象，既可作为一种除盐水混合硼酸的有效方法，也可用于研究压水堆（PWR）的承压热冲击（PTS）事故现象。当液体射流撞击水面时，发生气体夹带现象，并产生气泡，气泡夹带对混合过程起到关键的影响作用。研究了不同射流高度和流速下的含气率分布，设计了一种新型三层可移动线列阵传感器（WMS）测量瞬时二维局部空隙率，具有较高的空间分辨率（3 mm）和极高的时间分辨率（2500 Hz），基于线列阵传感器测量的原始数据，获得了射流冲击中气体夹带的含气率分布，对比分析了不同射流高度和流速下的平均含气率分布。

Study on Void Fraction Distribution of Plunging Jet Experiment with Wire Mesh Sensor

The plunging jet is a phenomenon of two phase gas-liquid flow,which could be an effective method to suf?ficiently mix boric acid with de-ionized water,and is suitable for studying the Pressurized Thermal Shock(PTS)acci?dent scenario of Pressurized Water Reactors(PWR). The air is entrained when the liquid jet hits the water surface, which generates bubbles during the air entrainment. This bubble entrainment has a crucial influence on the mixing process. The distribution of void fraction was studied in dependence of the jet length and flow rate. A movable three-layer Wire Mesh Sensor(WMS)is designed to measure sequences of instantaneous two-dimensional gas fractions with a high-resolution in space and time,which,from the data,derives the void fraction distributions. Comparisons of average void fraction are carried out with different jet lengths and flow rates.