• 关键词：计量学  切割器  PM₁₀  捕集效率  切割粒径  进气流量

• 基金项目：国家质量基础的共性技术研究与应用国家重点研发计划（No.2017YFF0205504）；中国博士后科学基金面上资助项目（No.2019M660538）

• 刘佳琪
• 北京市计量检测科学研究院, 北京 100029

• 张国城
• 北京市计量检测科学研究院, 北京 100029

• 吴丹
• 北京市计量检测科学研究院, 北京 100029

• 赵晓宁
• 北京市计量检测科学研究院, 北京 100029

• 沈上圯
• 北京市计量检测科学研究院, 北京 100029

• 荆文杰
• 北京市计量检测科学研究院, 北京 100029

• 摘要：PM₁₀切割器是对大气颗粒物粒径进行分离的重要部件，会影响PM₁₀监测结果的准确性.本研究通过搭建基于静态箱法的切割器捕集效率评价系统，对进口和国产的两款旋风式PM₁₀切割器的捕集效率进行了评价，通过使用标准规定的8种粒径单分散聚苯乙烯微球，测量并拟合了PM₁₀切割器的捕集效率曲线，最终获取D_a50（PM₁₀切割器的捕集效率为50%时对应的空气动力学粒径）及几何标准偏差.评价结果表明，该装置能满足PM₁₀切割器的评价需求，所评价的两个PM₁₀切割器的D_a50分别为10.43 μm和10.44 μm，性能指标均符合标准规定，且进气流量增大时，PM₁₀切割器的D_a50呈减小趋势.该研究结果对于进一步规范切割器的制造及使用具有科学意义.

• Abstract：PM₁₀ cutter is an important component for separating the particle sizes of atmospheric particles, which affects the accuracy of PM₁₀ monitoring results. In this study, we developed an evaluation system to quantify the cutter's collection efficiency, based on static box method. Two cyclone PM₁₀ cutters were systematically compared with eight types of monodispersed polystyrene particles, as specified in the standard. Through measurements and fitting of the obtained capture efficiency curve, D_a50 and geometric standard deviation were obtained. Results show that the proposed evaluation system can meet the requirements of quantifying capture efficiency of PM₁₀ cutters. D_a50 of the two evaluated PM₁₀ cutters are 10.43 μm and 10.44 μm, respectively. The cutters' performances fulfill the standard requirements. Moreover, D_a50 were found decreasing when the inflow airflow rate rose, which has scientific significance for further standardizing the manufacture and application of PM₁₀ cutters.

• Key words：metrology  cutter  PM₁₀  collection efficiency  cut diameter  inlet flow

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