Experimental Study of the Effect of Subsonic Exhaust Gas Diffusers on the Test Cell Wall and TF39 Cold-Flow Model Engine Exhaust Nozzle Plug and Core Engine Cowl Surface Pressures

摘要

An experimental investigation was conducted to determine the effects of exhaust gas collectors/subsonic diffusers on engine and test cell surface pressures during tests of high-bypass-ratio front-fan engines in ground test facilities. A one-tenth scale model of a TF39 turbofan engine installed in a one-tenth scale model of Propulsion Development Test Cell (J-1) was employed. Engine cowl and plug surface pressure data were recorded during model engine operation with cold air at five simulated power settings without exhaust collector, with exhaust collector, with exhaust collector equipped with a conventional subsonic diffuser, and with exhaust collector equipped with a segmented subsonic diffuser which separately diffused the fan and core engine exhaust jets. (Author Modified Abstract)