本研究在中高压热工水力实验平台上开展了2×2棒束通道的流动沸腾实验,在不同的热流密度、入口过冷度和压力下,测量了局部位置的两相参数,数据总量为41个工况。加热工况子通道内径向气泡行为实验数据类型包括空泡份额、界面面积浓度、汽泡速度和汽泡弦长。双探头电导探针获取到的汽泡电压信号通过NI数据采集卡采集并以TDMS文件格式进行储存,在数据处理过程需要通过Matlab进行信号识别以及信号匹配。实验回路和实验本体均采用K型铠装热电偶进行温度测量,测量误差为±0.5℃;压力、压差表(川仪PDS403H-1FS0-A1NA/G61)的采集精度为0.075%;流量表(3351-DP33M3B3F22压力变送器)的采集精度为0.05%。温度数据采用NI 9212数据采集卡和NI 9213数据采集卡采集,其采集精度分别为±0.0093 mV和6 μV。压力、压差以及流量数据采用NI 9205数据采集卡采集,其采集精度为±3.23 mV。双探头电导探针获取得到的空泡份额、界面面积浓度、汽泡速度和汽泡弦长的不确定度分别为7.56%、13.61%、13.61%和11.32%。
The flow boiling experiments were performed in 2×2 rod bundle channel using a medium-high pressure thermal-hydraulic experimental platform. The two-phase parameters were measured at various heat flux, inlet subcooling, and pressure at localized positions, resulting in a total of 41 operating conditions. The experimental data for bubble behavior in the heated condition subchannel included measurements of void fraction, interfacial area concentration, bubble velocity, and bubble chord length. The voltage signals generated by double sensor conductivity probe were collected using an NI data acquisition card and stored in TDMS file format. Signal recognition and matching are essential during the data processing stage utilizing Matlab. Both the experimental circuit and the experimental object employ K-type armored thermocouples for temperature measurement, exhibiting a measurement error within ±0.5℃. The pressure and differential pressure gauge (Chuanyi PDS403H-1FS0-A1NA/G61) demonstrates a collection accuracy of 0.075%. The flow meter (3351-DP33M3B3F22 pressure transmitter) has an acquisition accuracy of 0.05%. Temperature data is collected through the use of NI 9212 and NI 9213 data acquisition cards, with collection accuracies of ±0.0093 mV and 6 μV respectively. The pressure, pressure difference, and flow rate data are collected using the NI 9205 data acquisition card, with a collection accuracy of ±3.23 mV. The uncertainties associated with the void fraction, interfacial area concentration, bubble velocity, and bubble chord length measured using the double sensor conductivity probe are 7.56%, 13.61%, 13.61%, and 11.32% respectively.