大气飘尘冲击式分级采样器

本文分析了冲击式分级采样器的工作原理,对采样器中各种几率给予了严格的定义,阐明了这些几率概念之间的差别和相互联系,提出了多级采样器的研究简化为单级采样器研究的方法.提供了考虑粘性效应及用二种阻力公式(斯托克斯公式和标准阻力公式)的数值计算的P(Θ,Ω~*)曲线.对采样器工作特性曲线作了分析,指出各级主要采集粒径的范围大小和绝对收集几率的互相制约关系.提出采样器全面性能计算和设计方法.按本文提出的方法设计的LH-1型采样器,性能达到设计指标,已通过产品成果鉴定.

A MULTI-STAGE IMPACTOR SAMPLER FOR AIR-BORNE PARTICULATES

In this paper, the principle of the multi-stage impactor sampler was discribed and collection probability by means of a distribution function was defined. It must be pointed out that a multi-stage sampler can well be studied just like a single-stage one if the concept of relative collection probability is introduced. Through analysis of the characteristic curves of the samplers, this paper indicates that there are restraints between the main size range of collected particles and the absolute collection probability. Finally, performance calculation and optimum design of the sampler are given. An appraisal has been done for the LH-1 type sampler designed by using this method, expected performance has been met with success.