بررسی پارامترهای جت مکشی در کنترل جریان وامانده دینامیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده هوافضا، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این پژوهش، تاثیر پارامتر‌های مرتبط با جت مکشی در کنترل جریان وامانده دینامیکی بالواره ناکا0012 در رینولدز135000 مورد بررسی قرار گرفته است. بدین منظور از کمیت‌های ضرایب و عملکرد آیرودینامیکی میانگین برای مقایسه تاثیر جت‌های مختلف استفاده شده‌است. سرعت جت، زاویه مکش، اندازه دهانه خروجی و مکان جت به عنوان پارامترهای موثر در جت مکشی در نظر گرفته شده‌اند. بالواره حول یک چهارم وتر به صورت سینوسی نوسان می‌کند و زاویه حمله آن در اثر این حرکت از 5- درجه به 25 درجه می‌رسد. زوایای 30، 60 و 90 درجه و مکان‌های 1، 4، 6، 10 و 20 درصد طول وتر برای بررسی تاثیر زاویه و مکان جت مکشی انتخاب شدند. برای اندازه دهانه مقادیر 0.01 و 0.005 طول وتر انتخاب شد. مقادیر 0.04، 0.08 و 0.14 برای ضریب ممنتوم جت با اندازه دهانه ثابت در نظر گرفته شد. نتایج نشان دادند که مکان 4 درصد طول وتر نسبت به بقیه مکان‌ها برای قرارگیری جت مکشی مناسب‌تر است و با افزایش زاویه مکش و نزدیک‌شدن به زاویه 90 درجه، جت تاثیر بهتری در کنترل جریان از خود نشان می‌دهد. تاثیر سرعت جت و اندازه دهانه نیز به گونه‌ای است که با افزایش آن‌ها عملکرد جت بهبود می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Suction Jet Parameters in Flow Control of Dynamic Stall

نویسندگان [English]

  • Siroos Kasmaiee
  • Mehran Tadjfar
  • Saman Kasmaiee
Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

The effect of suction jet parameters on the control of the dynamic stall of a NACA0012 has been investigated at Reynolds number of 13500. Average coefficients and average aerodynamic performance were used to compare and evaluate the impact of different jets. Location, velocity amplitude, suction angle and orifice length were considered as the effective and changeable parameters in the suction jet. Angles of 30, 60 and 90 degrees and locations of 1, 4, 6, 10 and 20 percent of the chord length were selected to investigate the effect of the angle and location of the suction jet, respectively. Values of 0.01 and 0.005 of chord length were chosen for the opening length. Values of 0.04, 0.08 and 0.14 were considered for jet momentum coefficient at fixed orifice length. The results showed that the location of 4% of the chord length is more suitable than other locations for placing the suction jet, and by increasing the suction angle and approaching to 90 degrees, the jet had a better effect on the flow control. The effect of jet velocity and orifice size is such that increasing them improves jet performance.

کلیدواژه‌ها [English]

  • Dynamic stall
  • Suction jet
  • Active flow control
  • Oscillating airfoil
  • Aerodynamics performance
  1. N. D. Ham and M. S. Garelick, “Dynamic stall considerations in helicopter rotors,” Journal of the American Helicopter Society, Vol. 13, No. 2, pp. 49–55, (1968).
  2. W. J. McCroskey, L. W. Carr, and K. W. McAlister, “Dynamic stall experiments on oscillating airfoils,” AIAA Journal, Vol. 14, No. 1, pp. 57–63, (1976).
  3. K. W. McAlister, S. L. Pucci, W. J. McCroskey, and L. W. Carr, “An Experimental Study of Dynamic Stall on Advanced Airfoil Sections. Volume 2. Pressure and Force Data.,” (1982).
  4. P. F. Lorber and F. O. Carta, “Airfoil dynamic stall at constant pitch rate and high Reynolds number,” Journal of Aircraft, Vol. 25, No. 6, pp. 548–556, (1988).
  5. B. J. Pruski and R. D. W. Bowersox, “Leading-edge flow structure of a dynamically pitching NACA 0012 airfoil,” AIAA Journal, Vol. 51, No. 5, pp. 1042–1053, (2013).
  6. T. Lee and P. Gerontakos, “Investigation of flow over an oscillating airfoil,” Journal of Fluid Mechanics, Vol. 512, pp. 313–341, (2004).
  7. M. R. Visbal and J. S. Shang, “Investigation of the flow structure around a rapidly pitching airfoil,” AIAA Journal, Vol. 27, No. 8, pp. 1044–1051, (1989).
  8. I. H. Tuncer, J. C. Wu, and C. M. Wang, “Theoretical and numerical studies of oscillating airfoils,” AIAA Journal, Vol. 28, No. 9, pp. 1615–1624, (1990).
  9. J. A. Ekaterinaris and M. F. Platzer, “Computational prediction of airfoil dynamic stall,” Progress in Aerospace Sciences, Vol. 33, No. 11–12, pp. 759–846, (1998).
  10. G. Martinat, M. Braza, Y. Hoarau, and G. Harran, “Turbulence modelling of the flow past a pitching NACA0012 airfoil at 105 and 106 Reynolds numbers,” Journal of Fluids and Structures, Vol. 24, No. 8, pp. 1294–1303, (2008).
  11. G. Martinat, Y. Hoarau, M. Braza, J. Vos, and G. Harran, “Numerical simulation of the dynamic stall of a NACA 0012 airfoil using DES and advanced OES/URANS modelling,” in Advances in Hybrid RANS-LES Modelling, Springer, pp. 271–278, (2008).
  12. S. Wang, D. B. Ingham, L. Ma, M. Pourkashanian, and Z. Tao, “Numerical investigations on dynamic stall of low Reynolds number flow around oscillating airfoils,” Computers and Fluids, Vol. 39, No. 9, pp. 1529–1541, (2010).
  13. S. Wang, D. B. Ingham, L. Ma, M. Pourkashanian, and Z. Tao, “Turbulence modeling of deep dynamic stall at relatively low Reynolds number,” Journal of Fluids and Structures, Vol. 33, pp. 191–209, (2012).
  14. E. Asgari and M. Tadjfar, “Assessment of four inflow conditions on large-eddy simulation of a gently curved backward-facing step,” Journal of Turbulence, Vol. 18, No. 1, pp. 61–86, (2017).
  15. S. Krajnović, “Large eddy simulation exploration of passive flow control around an Ahmed body,” Journal of Fluids Engineering, Vol. 136, No. 12, (2014).
  16. B. Khalighi, K.-H. Chen, and G. Iaccarino, “Unsteady aerodynamic flow investigation around a simplified square-back road vehicle with drag reduction devices,” Journal of Fluids Engineering, Vol. 134, No. 6, (2012).
  17. B. Sasson and D. Greenblatt, “Effect of leading-edge slot blowing on a vertical axis wind turbine,” AIAA Journal, Vol. 49, No. 9, pp. 1932–1942, (2011).
  18. H. F. Müller-Vahl, C. Strangfeld, C. N. Nayeri, C. O. Paschereit, and D. Greenblatt, “Control of thick airfoil, deep dynamic stall using steady blowing,” AIAA Journal, Vol. 53, No. 2, pp. 277–295, (2015).
  19. H. F. Müller-Vahl, C. N. Nayeri, C. O. Paschereit, and D. Greenblatt, “Dynamic stall control via adaptive blowing,” Renewable Energy, Vol. 97, pp. 47–64, (2016).
  20. C. Chen, R. Seele, and I. Wygnanski, “Separation and circulation control on an elliptical airfoil by steady blowing,” AIAA Journal, Vol. 50, No. 10, pp. 2235–2247, (2012).
  21. C. Chen, R. Seele, and I. Wygnanski, “Flow control on a thick airfoil using suction compared to blowing,” AIAA Journal, Vol. 51, No. 6, pp. 1462–1472, (2013).
  22. Z. Wang and I. Gursul, “Lift enhancement of a flat-plate airfoil by steady suction,” AIAA Journal, Vol. 55, No. 4, pp. 1355–1372, (2017).
  23. S. H. Kim and C. Kim, “Separation control on NACA23012 using synthetic jet,” Aerospace Science and Technology, Vol. 13, No. 4–5, pp. 172–182, (2009).
  24. P. Catalano and R. Tognaccini, “RANS analysis of the low-Reynolds number flow around the SD7003 airfoil,” Aerospace Science and Technology., Vol. 15, No. 8, pp. 615–626, (2011).
  25. M. Tadjfar and E. Asgari, “Active flow control of dynamic stall by means of continuous jet flow at Reynolds number of 1$times$ 106,” Journal of Fluids Engineering, Vol. 140, No. 1, (2018).
  26. W. Zhang, Z. Zhang, Z. Chen, and Q. Tang, “Main characteristics of suction control of flow separation of an airfoil at low Reynolds numbers,” European Journal of Mechanics, Vol. 65, pp. 88–97, (2017).
  27. M. Tadjfar and E. Asgari, “The role of frequency and phase difference between the flow and the actuation signal of a tangential synthetic jet on dynamic stall flow control,” Journal of Fluids Engineering, Vol. 140, No. 11, (2018).
  28. E. Bakhtiari, S. F. Chini, and others, “A numerical study of slip velocity effects on a 2D airfoil dynamic analysis,” Modares Mechanical Engineering, Vol. 18, No. 8, pp. 183–192, (2018).
  29. A. Rabienataj Darzi and S. Vadudi Mofid, “Flow control via co-flow jet over Clark-Y airfoil,” Modares Mechanical Engineerin, Vol. 17, No. 2, pp. 147–156, (2017).
  30. E. Bakhtiari, “Effects of Oscillation Parameters of a Wind Turbine Airfoil with Slip Velocities on Aerodynamic Loads,” Modares Mechanical Engineering, Vol. 19, No. 9, pp. 2093–2104, (2019).
  31. K. Gharali and D. A. Johnson, “Dynamic stall simulation of a pitching airfoil under unsteady freestream velocity,” Journal of Fluids and Structures, Vol. 42, pp. 228–244, (2013).