Abstract
Numerical simulation of separation control using a synthetic jet was performed on NACA23012 airfoil. The computed results showed that stall characteristics and control surface performance could be improved substantially by resizing the separation vortices. It was observed that actual flow control mechanism was fundamentally different depending on the range of synthetic jet frequency. For low frequency range, small vortices due to synthetic jet penetrated to the large leading edge separation vortex flow, and as a result, the size of the leading edge separation vortex remarkably decreased. For high frequency range, however, the small vortex did not grow enough to penetrate into the large separation vortex, but the synthetic jet changed airfoil circulation directly. The synthetic jet conditions for effective lift increase are as follows: the non-dimensional frequency of the synthetic jet is 1; the location of the synthetic jet slot is the same as the separation point; and the jet velocity is large enough to perturb the separated flow. By exploiting these conditions, it was observed that the combination of the synthetic jet with a simple high lift device could be as good as a conventional fowler flap system.
Similar content being viewed by others
References
Abbott, I. H. and Doenhoff, A. E., 1959, “Theory of Wing Sections,” Dover Publications Inc.
Amitay, M., Smith, D., Kibens, V., Parekh, D. and Glezer, A., 2001, “Aerodynamic Flow Control over an Unconventional Airfoil using Synthetic Jet Ac-tuators,”AIAA Journal, Vol. 39, No. 3, pp. 361–370.
Bardina, J. E., Huang, P. G. and Coakley, T. J., 1997, “Turbulence Modelling Validation, Testing and Development,” NASA TM-110446.
Chatlynee, E., Rumigny, N., Amitay, M. and Glezer, A., 2001, “Virtual Aero-shaping of a Clark-Y Airfoil using Synthetic Jet Actuators,”AIAA paper 2001-0732.
Chorin, A. J., 1968, “Numerical Solution of the Navier-Stokes Equations,”Mathematics of Computation, Vol. 22, pp. 745–762
Collins, F. G. and Zelenevits, J., 1975, “Influence of Sound upon Separated Flow over Wing,”AIAA Journal, Vol. 13, No. 3, pp. 408–410.
Donovan, J. K., Kral, L. D. and Cary, A. W., 1998, “Active Flow Control Applied to an Airfoil,”AIAA paper 98-0210.
Gad-el-Hak, M., 2002, “The MEMS handbook,” CRC press, Boca Raton, Florida.
Flo, C. M. and Tai, Y. C., 1998, “Micro-Electro-Mechanical System (MEMS) and Fluid Flow,”Annual Review of Fluid Mechanics, Vol. 30, pp. 579–612.
Kim, C. S., Kim, C. and Rho, O. H., 2000, “Parallel Computations of High-lift Airfoil Flows using Two-equation Turbulence Models,”AIAA Journal, Vol. 38, No. 8, pp. 1360–1368.
Kral, L. D., Donovan, J. F., Cain, A. B. and Cary, A. W., 1997, “Numerical Simulation of Synthetic Jet Actuators,”AIAA paper 97-1824.
Nagib, H. et al., 2003, DARPA XV-15 TiltRotor Micro Adaptive Flow Control (MAFC) flight presentation, URL: http://fdrc.iit.edu/research/nagibRe-search.php
Ravi, B. R., Mittal, R. and Najjar, F. M., 2004, “Study of Three-dimensional Synthetic Jet Flowfields using Direct Numerical Simulation,”AIAA paper 2004-0091.
Seifert, A. and Pack, L. G., 1999, “Oscillatory Control of Separation at High Reynolds Numbers,”AIAA Journal, Vol. 37, No. 9, pp. 1062–1071.
Seifert, A., Bachar, T., Wygnanski, L., Koss, D. and Shepshelovich, M., 1993, “Oscillatory Blowing, a Tool to Delay Boundary Layer Separation,”AIAA Journal Vol. 31, No. 11, pp. 2052–2060.
Smith, B. L. and Glezer, A., 2002, “Jet Vectoring using Synthetic Jets,”Journal of Fluid Mechanics, Vol. 458, pp. 1–34.
Wenzinger, C. J. and Harris, T. A., 1939, “Windtunnel Investigation of an NACA23012 Airfoil with Various Arrangements of Slotted Flaps,” NACA Re-port No. 664.
Yoon, S. and Kwak, D., 1991, “Three-dimensional Incompressible Navier-Stokes Solver Using Lower-Upper Symmetric Gauss-Seidel Algorithm,”AIAA Journal, Vol. 29, No. 6, pp. 874–875.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, S.H., Hong, W. & Kim, C. Separation control mechanism of airfoil using synthetic jet. J Mech Sci Technol 21, 1367 (2007). https://doi.org/10.1007/BF03177422
Received:
Revised:
Accepted:
DOI: https://doi.org/10.1007/BF03177422