Turbulent burst control through phase-locked traveling surface depressionsThe influence of a traveling, surface depression on turbulent pre-burst flow has been investigated both theoretically and experimentally. Two-dimensional calculations of a transverse vortex (representing a 'typical' eddy) embedded in a laminar boundary layer show that properly phased-wall motion can reduce vorticity and raise wall pressure beneath the convecting vortex. Experiments in low-speed air with an electromagnetically driven wall membrane show that a traveling wall depression can accelerate flow near the wall and reduce pre-burst Reynolds stress.
Document ID
19850043783
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wilkinson, S. P. (Nasa, Langley Research Center High-Speed Aerodynamics Div., Hampton, VA, United States)
Balasubramanian, R. (NASA Langley Research Center Hampton, VA., Cambridge Hydrodynamics, Inc., Princeton, NJ, United States)