PROGRESS IN DEVELOPMENT OF A RIG FOR TESTING VARIABLE AREA EXHAUST NOZZLES FOR TURBOJET ENGINES FITTED WITH AFTERBURNERS

摘要

A test rig, consisting of a preheat combustion chamber and a Derwent N.A.E. type afterburner has been developed for testing variable area exhaust nozzles. Air is supplied by a centrifugal compressor set. The air mass flow available is about 50 lb./sec., and in order to test at the correct pressure ratios a nozzle that was designed for use on an engine having a larger mass flow, a water-cooled plug has been used to reduce the nozzle exit area.n A test was conducted on a variable area nozzle that was designed in the Engineering Section of the N.A.E.