Venturi Air-Jet Vacuum Ejectors for High-Volume Atmospheric Sampling on Aircraft Platforms

Abstract

This report provides documentation of the installation and use of venturi air-jet vacuum ejectors for high-volume atmospheric sampling on aircraft platforms. It contains information on the types of venturis that are useful for meeting the pumping requirements of atmosphericsampling experiments. A description of the configuration and installation of the venturi system vacuum line is included with details on the modifications that were made to adapt a venturi to the NASA Electra aircraft at Goddard Space Flight Center, Wallops Flight Facility. Flight test results are given for several venturis with emphasis on applications to the Differential Absorption Carbon Monoxide Measurement (DACOM) system at Langley Research Center. This report is a source document for atmospheric scientists interested in using the venturi systems installed on the NASA Electra or adapting the technology to other aircraft. Introduction The NASA Global Tropospheric Experiment (GTE) program includes many trace-gas-s..