Abstract
Effects of synthetic jets on the wake of a D-shaped cylinder is investigated experimentally at a Reynolds number Re H = 47,000, based on incoming free-stream velocity and the cylinder height (H). The synthetic jets are introduced immediately from the upper and lower trailing edges of the cylinder. The upper and lower synthetic jets are operated in an in-phase or anti-phase mode, and at a momentum ratio C μ = 1.0% and perturbation frequency St A = 0.11 −0.37. The cylinder wake with perturbation is examined in detail and compared with that without, based on smoke-wire flow visualization, pressure transducer and hotwire rake measurements, and data analyses of spectra, tempo-spatial cross-correlation and proper orthogonal decomposition (POD). Large-scale vortical structures in the cylinder wake are significantly modified by the synthetic jets perturbations, exhibiting symmetric or asymmetric patterns, depending on the perturbation frequency and phase relationship of the synthetic jets. These observations are internally correlated with the drag force variations.
Article PDF
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Park, H., Lee, D., Jeon, W., Hahn, S., Kim, J., Kim, J., Choi, J., Choi, H.: Drag reduction in flow over a two-dimensional bluff body with a blunt trailing edge using a new passive device. J. Fluid Mech. 563, 389–414 (2006)
Choi, H., Jeon, W. -P., Kim, J.: Control of flow over a bluff body. Annu. Rev. Fluid Mech. 40, 113–139 (2008)
Meliga, P., Pujals, G., Serre, E.: Sensitivity of 2-D turbulent flow past a D-shaped cylinder using global stability. Phys. Fluids 24(061701) (2012)
Siegel, S., Cohen, K., Seidel, J., Mclaughlin, T.: Two dimensional simulation of a feedback controlled D-cylinder wake. 35th AIAA Fluid Dynamics Conf. Exhibit, 6-9 Toronto, Ontario Canada, paper no. AIAA, 2005–5019 (2005)
Stalnov, O., Palei, V., Fono, I., Cohen, K., Seifert, A.: Experimental estimation of a D-shaped cylinder wake using body-mounted sensors. Exp. Fluids 42, 531–542 (2007)
Palei, V., Seifert, A.: Effects of periodic excitation on the flow around a D-shaped cylinder at low Reynolds numbers. Flow Turbulence Combust 78, 409–428 (2007)
Pastoor, M., Henning, L., Noack, B. R., King, R., Tadmor, G.: Feedback shear layer control for bluff body drag reduction. J. Fluid Mech. 608, 161–196 (2008)
Thiria, B., Cadot, O., Beaudoin, J. -F.: Passive drag control of a blunt trailing edge cylinder. J. Fluids Struct. 25, 766–776 (2009)
Han, X., Krajnovic, S.: Very large eddy simulation of passive drag control for a D-shaped cylinder. J. Fluids Eng., Trans. ASME 135(101102) (2013)
Krajnovic, S., Fernandes, J.: Numerical simulation of the flow around a simplified vehicle model with active flow control. Int. J. of Heat Fluid Flow 31(1), 192–200 (2011)
Han, X., Krajnovic, S.: Study of active flow control for a simplified vehicle model using the PANS method. Int. J. Heat Fluid Flow 42, 139–150 (2013)
Parkin, D. J., Thompson, M. C., Sheridan, J.: Numerical analysis of bluff body wakes under periodic open-loop control. J. Fluid Mech. 739, 94–123 (2014)
West, G. S., Apelt, C. J.: The effect of tunnel blockage and aspect ratio on mean flow past a circular cylinder with Reynolds number between 10 4 to 10 5. J. Fluid Mech. 14, 361–377 (1982)
Liu, X. H., Gao, N.: An improved smoke-wire visualization technique for flow with relatively high velocities. 4th Int. Conf. Exp. Fluid Mech. Beijing , China Aug. 12–15 2014 (2014)
Li, Y. Q., Bai, H. L., Gao, N.: Drag of a D-shaped bluff body under small amplitude harmonic actuation. Theor. Appl. Mech. Lett. 5, 35–38 (2015)
Glezer, A., Amitay, M.: Synthetic jets. Annu. Rev. Fluid Mech. 34, 503–529 (2002)
Armstrong, B.J., Barnes, F.H.: The effect of a perturbation on the flow over a bluff cylinder. Phys. Fluids 29(7), 2095–2102 (1986)
Griffin, O. M.: Flow similitude and vortex lock-on in bluff body near-wake. Phys. Fluids A 1(4), 697–703 (1989)
Bonnet, J. P., Delville, J., Glauser, M. N., Antonia, R. A., Bisset, D. K., Cole, D. R., Fiedler, H. E., Garem, J. H., Hilberg, D., Jeong, J., Kevlahan, N. K. R., Ukeiley, L. S., Vincendeau, E.: Collaborative testing of eddy structure identification methods in free turbulent shear flows. Exp. Fluids 25, 197–225 (1998)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Gao, N., Li, Y.Q., Bai, H.L. et al. Effects of Synthetic jets on a D-Shaped Cylinder wake at a Subcritical Reynolds Number. Flow Turbulence Combust 97, 729–742 (2016). https://doi.org/10.1007/s10494-016-9712-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10494-016-9712-y