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Interaction of twin synthetic jets in attached and separated boundary layers: effects of yaw angle and phase difference

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Abstract

This paper further extends our understanding of the interaction between twin synthetic jets (SJs) in attached and separated laminar boundary layers, following our previous works on twin SJs at zero yaw angle (Wen and Tang in J Fluids Eng Trans ASME 139:091203, 2017). In current investigation, the twin-SJ-induced streamwise vortices and their influence on attached and separated laminar boundary layers are examined at two nonzero yaw angles and four phase differences. Dye visualization and CFD simulations are conducted to compare the interaction of SJ-induced three-dimensional streamwise vortices and their impacts on the attached boundary layer. Two-dimensional PIV measurements are then conducted to evaluate the control effect of the twin SJs on the separated boundary layer. Our previous works have revealed that at zero yaw angle, the twin SJs interact in a constructive way regardless of their phase difference. Here, we further find that when the twin SJs operate with nonzero yaw angles, their interaction can be destructive due to the nonzero lateral distance, but the level of destruction can be mitigated by adjusting their phase difference. The strength of twin-SJ induced vortices and their impacts in the near-wall region are evaluated through streamwise vorticity flux and excess wall shear stress, respectively. In the separated boundary layer, although generally decreasing with the increase of yaw angle, significant influence of twin SJs can still be observed by varying the phase difference.

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References

  • Amitay M, Glezer A (2002) Role of actuation frequency in controlled flow reattachment over a stalled airfoil. AIAA J 40(2):209–216

    Article  Google Scholar 

  • Chang LM, Wang LB, Song KW (2009) Numerical study of the relationship between heat transfer enhancement and absolute vorticity flux along main flow direction in a channel formed by a flat tube bank fin with vortex generators. Int J Heat Mass Transf 52(7–8):1794–1801

    Article  Google Scholar 

  • Dandois J, Garnier E, Sagaut P (2007) Numerical simulation of active separation control by a synthetic jet. J Fluid Mech 574:25

    Article  Google Scholar 

  • Glezer A (1988) The formation of vortex rings. Phys Fluids 31(12):3532–3542

    Article  Google Scholar 

  • Hunt J, Wray A, Moin P (1988) Eddies, streams, and convergence zones in turbulent flows. In: Proceedings of the 1988 Summer Program, Center For Turbulence Research, Stanford University, pp 193–208

  • Liddle S, Wood N (2005) Investigation into clustering of synthetic jet actuators for flow separation control application. Aeronaut J 109:35–44

    Article  Google Scholar 

  • Ramasamy M, Wilson JS, Martin PB (2010) Interaction of synthetic jet with boundary layer using microscopic particle image velocimetry. J Aircr 47(2):404–422

    Article  Google Scholar 

  • Salunkhe P, Tang H, Zheng Y, Wu Y (2016) PIV measurement of mildly controlled flow over a straight-wing model. Int J Heat Fluid Flow 62:552–559

    Article  Google Scholar 

  • Song KW, Liu S, Wang LB (2016) Interaction of counter rotating longitudinal vortices and the effect on fluid flow and heat transfer. Int J Heat Mass Transf 93:349–360

    Article  Google Scholar 

  • Tang H, Salunkhe P, Zheng Y, Du J, Wu Y (2014) On the use of synthetic jet actuator arrays for active flow separation control. Exp Thermal Fluid Sci 57:1–10

    Article  Google Scholar 

  • Watson M, Jaworski AJ, Wood NJ (2003) Contribution to the understanding of flow interactions between multiple synthetic jets. AIAA J 41:747–749

    Article  Google Scholar 

  • Wen X (2015) Study of synthetic jets in boundary layers. Ph.D. thesis, Nanyang Technological University, Singapore

  • Wen X, Tang H (2014) On hairpin vortices induced by circular synthetic jets in laminar and turbulent boundary layers. Comput Fluids 95:1–18

    Article  Google Scholar 

  • Wen X, Tang H (2016) Effect of phase difference on the interaction of hairpin vortices induced by in-line twin synthetic jets. J Vis 19(1):79–87

    Article  Google Scholar 

  • Wen X, Tang H (2017) Dye visualization of in-line twin synthetic jets in crossflows—a parametric study. J Fluids Eng 139(9):091203

    Article  Google Scholar 

  • Wen X, Tang H, Duan F (2015) Vortex dynamics of in-line twin synthetic jets in a laminar boundary layer. Phys Fluids 27(8):083601

    Article  Google Scholar 

  • Wen X, Tang H, Duan F (2016) Interaction of in-line twin synthetic jets with a separated flow. Phys Fluids 28:043602

    Article  Google Scholar 

  • Zhang S, Zhong S (2010) Experimental investigation of flow separation control using an array of synthetic jets. AIAA J 48(3):611–623

    Article  Google Scholar 

  • Zhong S, Zhang S (2013) Further examination of the mechanism of round synthetic jets in delaying turbulent flow separation. Flow Turbul Combust 91(1):177–208

    Article  Google Scholar 

Download references

Acknowledgements

The first author of this paper, Dr. Xin Wen, would like to acknowledge the financial support from Nanyang Technological University for his Ph.D. study. The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 11702172 and 11725209) for this study.

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Authors and Affiliations

  1. Gas Turbine Research Institute, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China

    Xin Wen & Yingzheng Liu

  2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China

    Hui Tang

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  1. Xin Wen
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  2. Hui Tang
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  3. Yingzheng Liu
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Correspondence to Xin Wen.

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Wen, X., Tang, H. & Liu, Y. Interaction of twin synthetic jets in attached and separated boundary layers: effects of yaw angle and phase difference. J Vis 21, 949–963 (2018). https://doi.org/10.1007/s12650-018-0500-8

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  • DOI: https://doi.org/10.1007/s12650-018-0500-8

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