Diffuser/ejector system for a very high vacuum environment

US4454753A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Kenneth E. Riggs · Huntsville, US
• Carl J. Wojciechowski · Harvest, US

Key dates

• Filing date: Aug 19, 1982
• Grant date: Jun 19, 1984
• Expiry date: Aug 19, 2002

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M15/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A system for testing space engines at sea level under a very low pressure environment. The system includes a space simulation chamber connected to a diffuser which has two variable area ratio ejectors connected to it in tandem. Each of the ejectors is driven by a jet engine, preferably a turbo jet. The system is capable of providing a low pressure environment of about three or four millimeters of mercury for testing of engines mounted in the space simulation chamber. The system also may be used for other purposes requiring very high vacuum, such as evaporation and dehydration of food products or drugs.