Vol 7, No 2 (2016) > Mechanical Engineering >

Characteristics of Vortex Ring Formation by Synthetic Jet Actuators in Different Cavities

Engkos A. Kosasih, Harinaldi Harinaldi, Ramon Trisno

 

Abstract: This paper presents a baseline study of the
development of turbulent flow separation for controlling aerodynamic phenomena,
especially in the design of the vehicle body. The purpose of this study was to
analyze the performance of synthetic jet actuators (SJAs) as one of the tools
that can be used in reducing the flow controller separation area on the bluff
body model of the vehicle. To get maximum results in the performance of the
SJA, this research starts with characterizing the actuator, including changes
in the shape of the cavity and orifice diameter. Cavity shapes tested were
half-ball (B), tube (T) and cone (K), while orifice diameters of 3, 5 and 8 mm
were examined. The study was conducted using both computational and
experimental approaches. Results from both types of research methods were
compared and displayed in graphical form. These results serve as a reference
for determining future research. The experimental results, in the form of the
flow rate for each type of cavity, determined the ability of different cavity
conditions to form vortex rings, whereas in CFD simulations, the formation of
vortex rings was demonstrated via the visualization of flow contours. Vortex
rings occurred in cavity conditions B3, T3, T5, K3 and K5. Vortex rings were
not formed on any type of cavity with an orifice having a diameter of 8 mm.
Keywords: Bluff body; Reverse Ahmed body; Synthetic jet actuator; Vortex ring

Full PDF Download

References


Ahmed S.R., Ramm G., Faltin G., 1984. Some Salient Features of the Time-averaged Ground Vehicle Wake. SAE Technical Paper 840300

Bruneau, C.-H., Creusé, E., Depeyras, D., Gilliéron, P., Mortazavi, I., 2011. Active Procedures to Control the Flow Past the Ahmed Body with a 25° Rear Window. International Journal of Aerodynamics, Volume 1(3/4), pp. 299–317

Conan, B., Anthoine, J., Planquart, P., 2011. Experimental Aerodynamic Study of a Car-type Bluff Body. Experiments in Fluids, Volume 50(5), pp. 1273–1284

Fares, E., 2006. Unsteady Flow Simulation of the Ahmed Reference Body using a Lattice Boltzmann Approach. Computers & Fluids, Volume 35(8–9), pp. 940–950

Gad-el-Hak, M., 1996. Modern Development in Flow Control. Applied Mechanics Review, Volume 49(7), pp. 365–379

Glezer, A., 1988. The Formation of Vortex Rings. Physics of Fluids, Volume 31(12), pp. 3532–3542

Groupe d’experts Intergouvernemental sur l’Evolution du Climat (GIEC), 2001. Bilan 2001 Des Changements Climatiques: Les Éléments Scientifiques. Available online at: http://www.developpement-durable.gouv.fr/Rapports-d-evaluation.html, Accessed on 27 January 2015

Harinaldi, Budiarso, Tarakka R., Simanungkalit S.P., 2011. International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS, Volume 11(03), pp. 24–30

Hintenberger, C., Garcia-Villalba, M., Rodi, W., 2004. The Aerodynamics of Heavy Vehicles: Trucks, Buses, and Trains. Berlin: Springer

Holman, R., Utturkar, Y., Mittal, R., Smith, B.L., Cattafesta, L., 2005. Formation Criterion for Synthetic Jets. AIAA Journal, Volume 43(10), pp. 2110–2116

Hucho, W.-H., 2002. Aerodynamik der stumpfen Körper-Physikalische Grundlagen und Anwendung in der Praxis. Braunschweig: Vieweg-Verlag

Hucho, W.-H., Sorvan, G., 1993. Aerodynamics of Road Vehicles. Annual Review of Fluid Mechanics, Volume 25, pp 485–537

International Energy Agency (IEA), 2007. World Energy Outlook, China and India Insights. Paris: OECD/IEA

Kourta, A., Gilléron, P., 2009. Impact of the Automotive Aerodynamic Control on the Economic Issues. Journal of Applied Fluid Mechanics, Volume 2(2), pp. 69–75

Minguez, M., Pasquetti, R., Serre E., 2008. High-order Large Eddy Simulation of Flow over the “Ahmed Body” Car Model. Physics of Fluids, Volume 20(9), pp. 095101-1–095101-1

Rouméas, M., Gilléron, P., Kourta, A., 2009a. Analysis and Control of Near-Wake Flow over a Square-back Geometry. Computers & Fluids, Volume 38(1), pp. 60–70

Rouméas, M., Gilléron, P., Kuorta, A., 2009b. Drag Reduction by Flow Separation Control on a Car after Body. International Journal for Numerical Method in Fluids, Volume 60(11), pp. 1222–1240

Smith, B.L., Glezer, A., 1998. The Formation and Evolution of Synthetic Jets. Physics of Fluids, Volume 10(9), pp. 2281–2297

Smith, B.L., Swift, G., 2001. Synthetic Jets at Large Reynolds Number and Comparison to Continuous Jets. Postdoctoral Research. USA: American Institute of Aeronautics and Astronautics

Uruba V., Hladik O., 2009. On the Ahmed Body Wake. In: Conference Colloquium FLUID DYNAMICS, Prague

Utturkar, Y., 2002. Numerical Investigation of Synthetic Jet Flow Fields. M.S. Thesis, Department of Mechanical Engineering, University of Florida