Development and Testing of an Efficient, Isokinetic, High- Volume Aerosol Filter Collection System for Use on Aircraft

这是一个设计、制造和测试两个用于飞机的新概念气溶胶入口的项目，作为最先进的飞机气溶胶采样系统的一部分。这些新进气道与常用的传统等速进气道的主要区别在于主动壁过滤的开发和使用。入口的“活动”壁上完全覆盖着一层形状的过滤基板，撞击这些被覆盖的壁上的颗粒应该很容易和有效地捕获。由于非层流、高气流速度和与流线的不对齐而导致的喷嘴湍流沉积不被认为是这些进口的主要问题。事实上，壁过滤可能被证明是气溶胶捕获的首选方法。提出了一系列的风洞和飞机实验来回答这个问题和其他问题。因此，困扰早期采样工作的气溶胶“壁损失”可能成为过去。这些进气口是我们正在开发的新型飞机取样系统的主要部分。美国国家科学基金会只要求为入口的设计、建造和测试提供资金；已寻求和获得其他资金，用于发展飞机抽样系统的其余部分。

This is a project to design, fabricate and test two new-concept aerosol inlets for use on aircraft, as part of a state-of-the-art, aircraft based aerosol sampling system. The major difference between these new inlets and commonly-used conventional isokinetic inlets is the development and use of active wall filtration. The "active" walls of the inlets are completely covered with a shaped filter substrate, and particles which hit these covered walls should be easily and efficiently captured. Turbulent deposition in the nozzle resulting from non-laminar flow, high airstream velocities and misalignment with the flow streamlines is not considered a major problem with these inlets. In fact, wall filtration may prove to be the preferred method of aerosol capture. A series of wind tunnel and aircraft experiments are proposed to answer this and other questions. Thus, aerosol "wall losses" which plagued earlier sampling efforts may become a thing of the past. These inlets are a major portion of a new aircraft sampling system we are in the process of developing. Funding is requested from NSF only for the design, building and testing of the inlets; other funding has been sought and acquired for the development of the remaining portions of the aircraft sampling system.