Testing Air-Breathing Supersonic Powerplants

Abstract

Basic information concerning the free jet method of supersonic development testing is presented. Parameters necessary to specify test hardware, define test facility capabilities, and optimize facilities for this type of testing are discussed. The substantial gains obtainable in a facility's testable range by separately exhausting engine gas flow and free jet air spilled around the engine are defined, as are performance levels of various free jet diffuser types. A nomograph is included which permits rapid estimation of facility requirements and/or capabilities.