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Unsteady Features of Jets in Lift and Cruise Modes for VTOL Aircraft
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English
Abstract
Experiments were performed to simulate jet plume effects associated with VTOL aircraft in takeoff and cruise modes. A water facility was used to investigate the influence of inclination angle and separation distance on the three-dimensional fountain flowfield generated by two impinging jets operating at a jet Reynolds number of 250,000. Substantial differences in the flow features were observed for different spacings between the jets. Plume effects in cruise mode were simulated by a supersonic unheated jet parallel to a wall. Variation of the distance between the wall and the edge of the plume is shown to have a major controlling effect on the supersonic screech instability.
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Authors
Citation
Kibens, V., Saripalli, K., Wlezien, R., and Kegelman, J., "Unsteady Features of Jets in Lift and Cruise Modes for VTOL Aircraft," SAE Technical Paper 872359, 1987, https://doi.org/10.4271/872359.Also In
References
- Saripalli K. R. “Laser Doppler Velocimeter Measurements in 3-D Impinging Twin-Jet Fountain Flows,” Turbulent Shear Flows 5 Springer-Verlag Berlin 1987
- Saripalli K. R. “LDV Measurements on Impinging Twin-Jet Fountain Flows with a Simulation Fuselage Undersurface,” Sixth Symposium on Turbulent Shear Flows Toulouse, France September 1987
- Wlezien R. W. “Nozzle Geometry Effects on Supersonic Jet Interaction,” AIAA Paper 87-2694 1987
- Saripalli K. R. Kroutil J. C. “A Novel Experimental Facility for Conducting Jet-Impingement Studies Related to VTOL Aircraft,” AIAA Paper 85-0052 1985
- Wlezien R. W. Kibens V. “The Influence of Nozzle Asymmetry on Supersonic Jets,” AIAA Paper 86-0277 1986
- Seiner J. M. “Advances in High Speed Jet Aeroacoustics,” AIAA Paper 84-2275 1984