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Abstract

A universal airborne-particle size-selective inlet (10) for separating particles (82) larger than a cut size from particles (84) smaller than the cut size is disclosed. The larger particles (82) are separated by inertial collection as they are drawn into the apparatus (10) in an air stream (78) which exits jet orifices (46) aligned with collector holes (34) leading to closed stagnation chambers (24). The larger particles (82) pass through the collector holes (34) and into the stagnation chambers (24) where they remain. The smaller particles (84) are carried by the flowing airstream (78) that turns at, and passes by, the collector holes (34) to an external downstream small particle collection device. The apparatus (10) can be used for any flow rate or cut size based on aerodynamic conditions and dimensional ratios that relate the jet orifice (46) sizes to the sampling flow rate, the throat depth of the jet orifices (46), and the distance from the internal exit of the jet orifices ( 46) to the entrance of the collector holes (34).

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First Claim