Boundary layer control by acoustic excitationAn experimental program in which the effectiveness of a single large eddy break-up device (LEBU) blade is enhanced by proper acoustic excitation is described. An acoustic pulse, phase-locked to the incident large eddies and directed at the LEBU can enhance the large eddy cancellation process and can in effect lead to a decrease in the skin friction coefficient. Cross-correlation data and turbulence intensity measurements show that this acoustic excitation causes eddy cancellation at the trailing edge of the manipulator plate. It is concluded that both reduced turbulent boundary layer mixing and significant drag reduction can be achieved upon proper acoustic input to a LEBU.
Document ID
19860060701
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Papathanasiou, A. G. (North Carolina State Univ. Raleigh, NC, United States)
Nagel, R. T. (North Carolina State University Raleigh, United States)