Abstract
A round air jet was actively controlled by a pair of lateral control jets. The control jets were generated by a pair of opposing synthetic jet actuators, which were driven by the pulse-modulated sinusoidal signal. Two carrier frequencies were tested, namely 160 Hz and 840 Hz. Moreover, control jets driven by un-modulated sinusoidal signals were also tested. An unforced continuous jet was used as the reference case, and for all cases, the Reynolds number of the main round jet was 1570 (related to the nozzle exit diameter of 10 mm). Experiments (flow visualization and hot-wire anemometry) revealed that the flow control caused a suppression of the jet core and a more rapid jet flow decay. In addition, the pulse modulation caused jet intermittency that was distinguished by the periodicity of the time-averaged and fluctuating velocity components. For the case of the lower carrier frequency of 160 Hz, a flapping motion of the controlled jet occurred and the jet formed a zigzag pattern.
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References
Azevedo LFA, Webb BW, Queiroz M (1994) Pulsed air jet impingement heat transfer. Exp Therm Fluid Sci 8:206–213
Bejan A (1995) Convection heat transfer, 2nd edn. Wiley, New York
Ben Chiekh M, Bera JC, Sunyach M (2003) Synthetic jet control for flows in a diffuser: vectoring, spreading and mixing enhancement. J Turbul 4:1–12
Blevins RD (2003) Applied fluid dynamics handbook. Krieger Publishing Company, Malabar
Broučková Z, Trávníček Z (2015) Visualization study of hybrid synthetic jets. J Vis 18:581–593
Camci C, Herr F (2002) Forced convection heat transfer enhancement using a self-oscillating impinging planar jet. J Heat Transf Trans ASME 124:770–782
Cater JE, Soria J (2002) The evolution of round zero-net-mass-flux jets. J Fluid Mech 472:167–200
Crow SC, Champagne FH (1971) Orderly structure in jet turbulence. J Fluid Mech 48:547–591
De Luca L, Girfoglio M, Coppola G (2014) Modeling and experimental validation of the frequency response of synthetic jet actuators. AIAA J 52:1733–1748
Durst Heim U, Ünsal B, Kullik G (2003) Mass flow rate control system for time-dependent laminar and turbulent flow investigations. Meas Sci Technol 14:893–902
Favre-Marinet M, Binder G, Hac TV (1981) Generation of oscillating jets. J Fluids Eng Trans ASME 103:609–614
Feero MA, Lavoie P, Sullivan PE (2015) Influence of cavity shape on synthetic jet performance. Sens Actuator A Phys 223:1–10
Glezer A, Amitay M (2002) Synthetic jets. Annu Rev Fluid Mech 34:503–529
Haneda Y, Tsuchiya Y, Nakabe K, Suzuki K (1998) Enhancement of impinging jet heat transfer by making use of mechano-fluid interactive flow oscillation. Int J Heat Fluid Fl 19:115–124
Herwig H, Mocikat H, Gürtler T, Göppert S (2004) Heat transfer due to unsteadily impinging jets. Int J Therm Sci 43:733–741
Hill WG Jr, Greene PR (1977) Increased turbulent jet mixing rates obtained by self-excited acoustic oscillations. J Fluids Eng Trans ASME 99:520–525
Hsiao FB, Chou YW, Huang JM (1999) The study of self-sustained oscillating plane jet flow impinging upon a small cylinder. Exp Fluids 27:392–399
Hussain AKMF, Hasan MAZ (1983) The ‘whistler nozzle’ phenomenon. J Fluid Mech 134:431–458
Kordík J, Trávníček Z (2017) Optimal diameter of nozzles of synthetic jet actuators based on electrodynamic transducers. Exp Therm Fluid Sci 86:281–294
Kordík J, Trávníček Z (2018) Non-harmonic excitation of synthetic jet actuators based on electrodynamic transducers. Int J Heat Fluid Fl 73:154–162
Kordík J, Broučková Z, Vít T, Pavelka M, Trávníček Z (2014) Novel methods for evaluation of the Reynolds number of synthetic jets. Exp Fluids 55:1757-1–1757-16
Mi J, Nathan GJ, Luxton RE (2001) Mixing characteristics of a flapping jet from a self-exciting nozzle. Flow Turbul Combust 67:1–23
Mladin EC, Zumbrunnen DA (1997) Local convective heat transfer to submerged pulsating jets. Int J Heat Mass Tran 40:3305–3321
Mohseni K, Mittal R (2015) Synthetic Jets: Fundamentals and Applications. CRC Press, Boca Raton
Nathan GJ, Hill SJ, Luxton RE (1998) An axisymmetric ‘fluidic’ nozzle to generate jet precession. J Fluid Mech 370:347–380
Pack LG, Seifert A (2001) Periodic excitation for jet vectoring and enhanced spreading. J Aircr 38:486–495
Page RH, Chinnock PS, Seyed-Yagoobi J (1996) Self-oscillation enhancement of impingement jet heat transfer. J Thermophys Heat Transf 10:380–382
Qayoum A, Gupta V, Panigrahi PK, Muralidhar K (2010) Influence of amplitude and frequency modulation on flow created by a synthetic jet actuator. Sens Actuator A Phys 162:36–50
Raman G, Rice EJ, Cornelius DM (1994) Evaluation of flip-flop jet nozzles for use as practical excitation devices. J Fluids Eng-Trans ASME 116:508–515
Reynolds WC, Parekh DE, Juvet PJD, Lee MJD (2003) Bifurcating and blooming jets. Annu Rev Fluid Mech 35:295–315
Smith BL, Glezer A (1998) The formation and evolution of synthetic jets. Phys Fluids 10:2281–2297
Smith BL, Glezer A (2002) Jet vectoring using synthetic jets. J Fluid Mech 458:1–34
Tamburello DA, Amitay M (2007a) Interaction of a free jet with a perpendicular control jet. J Turbul 8(21):1–27
Tamburello DA, Amitay M (2007b) Dynamic response of a free jet following the activation of a single synthetic jet. J Turbul 8(48):1–18
Thomas FO (1991) Structure of mixing layers and jets. Appl Mech Rev 44:119–153
Trávníček Z, Peszyński K, Hošek J, Wawrzyniak S (2003) Aerodynamic and mass transfer characteristics of an annular bistable impinging jet with a fluidic flip–flop control. Int J Heat Mass Transf 46:1265–1278
Trávníček Z, Němcová L, Kordík J, Tesař V, Kopecký V (2012) Axisymmetric impinging jet excited by a synthetic jet system. Int J Heat Mass Transf 55:1279–1290
Trávníček Z, Tesař V, Broučková Z, Peszyński K (2014) Annular impinging jet controlled by radial synthetic jets. Heat Transf Eng 35:1450–1461
Viets H (1975) Flip-flop jet nozzle. AIAA J 13:1375–1379
Zhang PF, Wang JJ (2007) Novel signal wave pattern for efficient synthetic jet generation. AIAA J 45:1058–1065
Zumbrunnen DA, Aziz M (1993) Convective heat-transfer enhancement due to intermittency in an impinging jet. J Heat Transf Trans ASME 115:91–98
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We gratefully acknowledge the support of the Grant Agency of the Czech Republic—Czech Science Foundation (project no. 16-16596S) and the institutional support RVO: 61388998.
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Broučková, Z., Trávníček, Z. Intermittent round jet controlled by lateral pulse-modulated synthetic jets. J Vis 22, 459–476 (2019). https://doi.org/10.1007/s12650-019-00550-z
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DOI: https://doi.org/10.1007/s12650-019-00550-z