Engine test facility, eg for ground testing of aircraft gas turbine engines

摘要

The engine test facility, eg run-up pen 80, has a primary noise barrier eg in the form of ramped rear wall 82 and an open ended exhaust efflux waveguide tube 70 for each engine which directs engine exhaust gases from the engine on to the rear wall 82. Thus, on release to the environment, much of the sound energy generated by each engine is transmitted to a location very close to the foot of the rear wall 82, increasing the ability of the wall to limit noise pollution. Reverse flow circulation of exhaust gases may be further reduced by collar members 84, 86 which may be lined with acoustic material. The run-up pen 80 may be provided with doors 88, 90 so that the test area is completely surrounded. A conventional run-up pen may be modified (figs. 6, 7) to comply with the invention.