03.3 - Basic Fluid Dynamics and Flow Control
VIBRATION INDUCED EXCITATION OF INSTABILITY WAVES IN A BLASIUS FLOW
E.R. Gowree, ISAE-SUPAERO, France; C.J. Atkin, University of East Anglia, United Kingdom
Here we have demonstrated that small amplitude vibration of the order of less than 10 micrometres can artificially excite Tollmien-Schlichting (TS) waves provided that the frequency of excitation within the unstable region of the neutral stability region obtained from linear stability theory. This is in line with previous observations. Further testing showed that longitudinally aligned motors generated more energetic TS waves and the growth rate increased with increasing number of live motors. But when a combination of both longitudinally and transversely align motors was tested a reduction in the growth rate was observed even when the total number of motors was larger than the most amplified case which was generated by 5 motors along the longitudinal axis. This observation encouraged further investigation into a possible technique for the control of the growth rate of TS waves.