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Hot gas environment around STOVL aircraft in ground proximity. I - Experimental study

1992; American Institute of Aeronautics and Astronautics; Volume: 29; Issue: 1 Linguagem: Inglês

10.2514/3.46126

1533-3868

Roderick J. Maclean, J. P. Sullivan, S. Narasimha Murthy,

Combustion and flame dynamics

In connection with the problems of the ingestion of exhaust gases of engines in V/STOL and STOVL aircraft in ground effect, an experimental investigation was conducted on a typical model configuration using marker nephelometry to establish the interactions between the jets, forward velocity, and the ground. The test rig consisted of a two inlet configuration with four low subsonic velocity jets impacting vertically on a flat plate; the vertical distance between the plate and model undersurface was adjustable. A wind tunnel provided forward airflow to simulate landing into a wind with a velocity that could be set at 0-0.1 times the jet velocity. A videotape of concentration distribution revealed several vortical features in the interaction region, which were affected variously by the distance between the ground plane and model and the inlet suction. The frame-averaged data compared favorably with time-averaged predictions carried out elsewhere in a companion investigation. However, such predictions did not seem to reveal several aspects of the vortical flow features that should affect instantaneous distortion into the engine inlet.