中国激光, 2019, 46 (1): 0104006, 网络出版: 2019-01-27   

鞘流技术在气溶胶颗粒物光学传感器上的应用研究 下载: 1121次

Application of Sheath Flow Technique in Aerosol Particle Sensor
作者单位
1 中国科学院上海光学精密机械研究所信息光学与光电技术实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 上海镭慎光电科技有限公司, 上海 201800
摘要
鞘流技术是实现高浓度气溶胶颗粒物光学检测的关键技术之一。在空气动力学理论和国外相关研究的基础上设计了一种气体鞘流器来实现高浓度气溶胶粒子的有效测量。首先根据大型通用有限元分析软件ANSYS中的Gambit和Fluent模块对鞘流器进行仿真分析,确定了一组最佳的设计参数并依此制作了相应的鞘流器实物, 仿真结果表明该鞘流器可以将样气气流直径从1 mm压缩到0.34 mm, 有明显的压缩效果。接着提出了一种用光学尘埃粒子计数器的粒径分布误差间接分析鞘流器压缩效果的实验方案, 并对比分析了在同一台粒子计数器上分别配置1.0 mm普通气嘴、0.5 mm普通气嘴以及鞘流气嘴三种情况下0.3 μm粒子粒径的分布情况。实验结果表明, 本研究设计的鞘流器能够有效降低尘埃粒子的重叠率, 显著提升粒子计数器的浓度检测上限值。该结果验证了流体动力学分析的可行性, 为实现高浓度气溶胶粒子的光学测量提供了重要基础。
Abstract
Sheath flow is one of the key technologies for the optical detection of high concentration aerosol particles. Based on the aerodynamics theory and the related researches abroad, a gas sheath flow jet is designed to achieve the effective measurement of high concentration aerosol particles. First, a group of optimal design parameters are determined according to the simulation analysis by the Gambit and Fluent modules in the large-scale general finite element analysis software of ANSYS, and a real sheath flow jet is made as well. In addition, the simulation results show that the sheath flow jet can compress the diameter of sample air flow from 1 mm to 0.34 mm, and the compression effect is obvious. Then, a kind of experiment scheme is put forward, in which the compression effect of a sheath flow jet is indirectly analyzed using the size distribution errors of a particle counter. Finally, the comparison and analysis of 0.3 μm particle distributions are achieved for 1.0 mm ordinary jet, 0.5 mm ordinary jet and sheath flow jet on the same particle counter. The experimental results show that the sheath flow jet designed here can effectively reduce the overlap rate of dust particles and significantly increase the concentration detection limit of a particle counter. These results verify the feasibility of hydrodynamic analysis and provide an important basis for the optical measurement of high concentration aerosol particles.

鲁晨阳, 张佩, 王光辉, 朱菁, 黄惠杰. 鞘流技术在气溶胶颗粒物光学传感器上的应用研究[J]. 中国激光, 2019, 46(1): 0104006. Lu Chenyang, Zhang Pei, Wang Guanghui, Zhu Jing, Huang Huijie. Application of Sheath Flow Technique in Aerosol Particle Sensor[J]. Chinese Journal of Lasers, 2019, 46(1): 0104006.

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