层流型凝聚核粒子生长器的设计与测试

Design and test of laminar condensed particle growth device

为了探究层流型凝聚核粒子计数器的关键部分凝聚核粒子生长器的尺寸结构和流场参数之间的相关性,通过多孔介质材料配合相应内部结构的设计,研制气液物理位置重合、流场相互独立的凝聚核粒子生长器;利用该装置实验得到的水蒸气挥发速率耦合入气流流场进行仿真,研究采样流湿度、调节段温度和生长段温度对装置内部流场过饱和度分布造成的影响。结果表明,采样流湿度为100%,调节段壁面温度为10℃,生长段壁面温度为50℃时,能够得到最理想的过饱和度为2.8。

In this paper,the correlation between the size structure and flow field parameters of the key part of Laminar condensed particle counter,laminar condensed particle growth device,was studied. Through the porous media material and the design of the corresponding internal structure,laminar condensed particle growth device is successfully developed,with the gas and liquid physical positions coincide but the flow fields are independent of each other. The water vapor evaporation rate obtained through the experiment of the device is coupled into the airflow flow field for simulation,and explore the influence of the sampling flow humidity,the temperature of the regulation section and the temperature of the growth section on the supersaturation distribution of the flow field inside the device. When the sampling flow humidity is 100%,the wall temperature of the adjusting section is 10 ℃,and the wall temperature of the growing section is 50 ℃,the optimal supersaturation 2.8 can be obtained.