基于红外热像的喷雾吸收特性及其可视化试验研究

IR Thermography Based Experimental Research on the Characteristics and Visualization of Spray Absorber

通过试验,利用红外热像仪对LiNO3-NH3-He三元工质扩散吸收式制冷机中喷雾吸收器的吸收过程进行红外热像记录,获得了喷雾吸收过程的宏观特点,实现了喷雾吸收过程的可视化。结果表明,红外热像可以为判断喷雾吸收过程的强度与效果提供直观的依据,同时发现,喷雾吸收器中同一水平面上的温度分布较为均匀,而垂直方向上存在4个反映不同吸收特征的温度分区,并据此将其吸收过程分为零吸收喷射区、吸收主流区、吸收饱和区和过冷区4个区间。分析还表明,红外热像图可为喷雾吸收器的结构优化设计提供有效依据,得出现有喷雾吸收器的体积可缩小37.5%～50%。

Experiments were carded out by using infrared thermography （IR thermography） to record the wall-temperature fields of spray absorber in a diffusion-absorption refrigeration system using LiNO3-NH3-He as working fluids, by which the absorption process of spray absorber were visualized and the gross features of spray absorption were obtained. The results show that the infrared thermal images can be used as a direct-vision method to estimate the intensity and effect of absorption. Moreover, it is found that in the spray absorber, the temperatures on a same horizontal section is almost identical, but on the vertical section there exists four different temperature-zones which represents the different absorption characteristics and along the dropping direction of sprayed solution are respectively named as zero-absorbing jet zone, main-absorbing zone, saturated-absorbing zone and subcooled zone, which can be used to optimize the structure design of spray absorber and it obviously illustrates that the volume of experimental spray absorber can be reduced by 37.5%450%.