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The Development of Crossflow Vortices on a 45 Degree Swept Wing
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English
Abstract
Three-dimensional boundary-layer experiments are currently being conducted on a 45° swept wing in the Arizona State University Unsteady Wind Tunnel. Crossflow-dominated transition is produced via a model with contoured end liners to simulate infinite swept-wing flow. Fixed-wavelength stationary and travelling crossflow vortices are observed. The stationary vortex wavelengths vary with Reynolds number as predicted by linear-stability theory but with observed wavelengths which are about 25% smaller than theoretically predicted. The frequencies of the most-amplified moving waves are in agreement with linear-stability theory; travelling waves at higher frequencies than predicted are also observed. These higher-frequency waves may be harmonics of the primary crossflow waves generated by a parametric resonance phenomena. Boundary-layer profiles measured at several spanwise locations show streamwise disturbance profiles characteristic of the crossflow instability. Near the transition location severe distortions of the laminar boundary-layer profiles are observed. Mean-profile measurements are compared to theoretical predictions.
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Citation
Mousseux, M., Dagenhart, J., Saric, W., and Hoos, J., "The Development of Crossflow Vortices on a 45 Degree Swept Wing," SAE Technical Paper 892245, 1989, https://doi.org/10.4271/892245.Also In
References
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