MULTIPLE VELOCITY AEROSOL SAMPLING INLETS TO CONFORM

目前提议的主要目标是开发新的气雾剂。 取样口。这些进水口，使用一个全新的概念，将符合 具有比进水口更好的大小选择性气溶胶采样标准 目前正在使用中。人们认识到，更好地评价 如果不会造成危险的颗粒被 排除在空气质量浓度分析之外。申请的标准 空气中可吸入、可吸入和可吸入的颗粒物， 由Soderholm(1989)为此目的提出的，最近已被 被ACGIH、CEN和ISO采纳。然而，很难对其进行采样 根据修订后的标准，工作场所中的气雾剂 现有取样口的性能特性不理想。 个人和固定采样的拟议进水口将为 利用成熟的气溶胶惯性撞击理论和 非常规的结构。 不同射流速度的单级冲击器原型阵列 将在第一阶段研究中开发。新的进水口不仅将 提供更好的整体切割特性，以符合 修订的标准，但也将是简单，廉价，易于 做手术吧。此外，还对进气口进行了最终的修改和优化。 利用实验结果进行设计将导致紧凑的产品 可以在尘土飞扬的环境中工作一整班 而不会因过载而降低性能。

The primary objective of the current proposal is to develop new aerosol sampling inlets. These inlets, using an entirely new concept, will comply with size-selective aerosol sampling criteria better than the inlets currently being used. It is recognized that a better evaluation of the hazard is possible if particles which do not contribute to the hazard are excluded from the airborne mass concentration analysis. The criteria for inhalable, thoracic and respirable fractions of airborne particles, proposed by Soderholm (1989) for this purpose, have recently been adopted by ACGIH, CEN and ISO. However, it is difficult to sample aerosols in the workplace according to the revised criteria because of unsatisfactory performance characteristics of existing sampling inlets. The proposed inlets for both personal and stationary sampling will be developed using well established aerosol inertial impaction theory and unconventional structure. A prototype array of single stage impactors with different jet velocities will be developed in the Phase I study. The new inlets will not only provide much better overall cut-characteristics to comply with the revised criteria, but also will be simple, inexpensive, and easy to operate. Furthermore, the final modification and optimization of the inlet design using experimental results will lead to compact products which can be operated in a very dusty environment over a full work shift without degradation of performance due to overloading.