Abstract
The Langley Research Center has conducted an experimental program on a model of the F-18 airplane to determine the performance of nonaxisymmetr ic nozzles relative to the aircraft's baseline axisymmetric nozzle. The performance of a single-expansion ramp and a two-dimensional convergent-div ergent nozzle were compared to the baseline axisymmetric nozzles. The effects of vectoring and reversing were also studied. The results of this investigation indicate that nonaxisymmetric nozzles can be installed on a twin-engine fighter airplane with equal or better performance than axisymmetric nozzles. The nonaxisymmetric nozzles also offer potential for innovative and improved aircraft maneuver through thrust vectoring and reversing.
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