Study of acoustic disturbances effect on laminar separation bubble by IR thermography

Infrared thermography for convective heat transfer measurements

“…The printed circuit is generally manufactured with several adjacent thin (down to 5 lm) copper tracks, closely spaced, arranged in a Greek fret mode (see Fig. 5) (2000), Dorignac et al (2001Dorignac et al ( ,2005 and Petre et al (2003) T (1990b, 1995a) HTF S/LW Gartenberg and Roberts (1991a, b), and Gartenberg and Wright (1994) T S/LW Cardone et al (1996Cardone et al ( , 1997b, Astarita et al (2002) and Astarita and Cardone ( (1990a, 1993, 1995b) (2007) T FPA/MW Rotating surfaces Cardone et al (1996Cardone et al ( , 1997a, Astarita et al (2002) and Astarita and Cardone (2008) HTF S/LW Boutarfa and Harmand (2005) and Pelle and Harmand (2006 T S -Seghir-Ouali et al (2006) T S - Mori et al (2007Mori et al ( , 2008, Sekavcnik et al (2008) and Novak et al (2008) T FPA/SW Bajcar et al (2008) T FPA/B Lyons et al (2008) TF -Separation/bluff body de Luca et al (1992Luca et al ( , 1995b TF S/LW Cardone et al (1997b) HTF S/LW Meinders et al (1997Meinders et al ( , 1999a and Meinders and Hanjalic (2002) HTF S/MW Ghisalberti and Kondjoyan (2001) HTF FPA/MW Montelpare and Ricci (2004a), Montelpare (2005, 2006) and Ricci et al (2007) HTF FPA/LW Mai et al (2008) T - Menfoukh et al (2008) T FPA/B Hypersonic flows de Luca et al (1990ade Luca et al ( , 1992…”

Low Reynolds Number Flows and Transition

“…Theoretically the acoustic excitation induces T/S waves forcing the transition to begin (Ricci et al, 2007). Ricci et al (2005;2007) conducted studies on the effects of acoustic disturbances on laminar separation bubbles by means of IR thermography at Reynolds number of 6x10 4 .…”

“…Acoustic excitation is an active flow control method, in which typically a signal generator, amplifier and a sound source were used (Ricci et al, 2007). The frequency of the sound wave introduced to the flow can be adjusted with the changing behavior of the aerodynamic body.…”

“…Flow control methods can be categorized as active and passive flow control methods (Mohsen, 2011;Ricci et al, 2007). Active flow control can be made by adding energy to the free stream or to the boundary layer directly.…”

“…Passive flow control may be simple and cheap but it has its own disadvantages. This kind of geometrical discontinuities increase the drag force and since they are fixed, they cannot adjust with the changing location of the LSB and off-design conditions (Mohsen, 2011;Ricci et al, 2007). Shan et al (2008) carried out a numerical study on a NACA0012 aerofoil in three different cases.…”