Control of Elliptic Supersonic Jet of Aspect Ratio 3
Publication: Journal of Aerospace Engineering
Volume 30, Issue 5
Abstract
Control of a Mach 2 elliptic jet from a convergent-divergent elliptic nozzle of Aspect Ratio 3, with rectangular and triangular tabs of identical blockage, was studied experimentally at different levels of pressure gradient at the nozzle exit. At all levels of pressure gradient studied in this work, irrespective of tab geometry, the tabs along the minor axis promoted mixing and the tabs along the major axis retarded mixing. However, the level of mixing was sensitive to the tab geometry. The triangular tabs along the minor axis caused greater mixing than the rectangular tabs at all pressure gradients. The triangular tabs along the minor axis caused a maximum core length reduction of 77% at a Nozzle Pressure Ratio (NPR) 4 and a minimum of 64% at NPR 5. The maximum and minimum core length reductions caused by the rectangular tabs along the minor axis were 39%, at NPR 6 and 20%, at NPRs 5 and 8. Shadowgraphs of the jet show that the waves in the core were rendered weak by both rectangular and triangular tabs when placed along the minor axis.
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References
Ahuja, K. K., and Brown, W. H. (1989). “Shear flow control by mechanical tabs.” Proc., 2nd Shear Flow Conf., AIAA, Tempe, AZ.
Aravindh Kumar, S. M., and Rathakrishnan, E. (2016a). “Characteristics of a supersonic elliptic jet.” Aeronaut. J., 120(1225), 495–519.
Aravindh Kumar, S. M., and Rathakrishnan, E. (2016b). “Characteristics of controlled Mach 2 elliptic jet.” J. Propul. Power, 32(1), 121–133.
Aravindh Kumar, S. M., and Rathakrishnan, E. (2016c). “Elliptic jet control with triangular tab.” Proc., Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, SAGE Publications, Thousand Oaks, CA.
Aravindh Kumar, S. M., and Rathakrishnan, E. (2017). “Elliptic nozzle aspect ratio effect on controlled jet propagation.” Fluid Dyn. Res., 49(2), 025510.
Bohl, D., and Foss, J. F. (1996). “Enhancement of passive mixing tabs by the addition of secondary tabs.” Proc., 34th Aerospace Sciences Meeting and Exhibit, AIAA, Reno, NV.
Gutmark, E. J., and Schadow, K. C. (1987). “Flow characteristics of orifice and tapered jets.” Phys. Fluids, 30(11), 3448–3454.
Ho, C. M., and Gutmark, E. J. (1987). “Vortex induction and mass entrainment in a small-aspect ratio elliptic jet.” J. Fluid Mech., 179(1), 383–405.
Menon, N., and Skews, B. (2010). “Shock wave configurations and flow structures in non-axisymmetric underexpanded sonic jets.” Shock Waves, 20(3), 175–190.
Mitchell, D., Honnery, D., and Soria, J. (2013). “Near-field structure of underexpanded elliptic jets.” Exp Fluids, 54(7), 1578.
Quinn, W. R. (1989). “On mixing in an elliptic turbulent free jet.” Phys. Fluids, A1(10), 1716–1722.
Rathakrishnan, E. (2009). “Experimental studies on the limiting tab.” AIAA J., 47(10), 2475–2485.
Rathakrishnan, E. (2010). Applied gas dynamics, Wiley, Hoboken, NJ.
Rathakrishnan, E. (2016). Instrumentation, measurements, and experiments in fluids, 2nd Ed., CRC Press, Boca Raton, FL.
Schadow, K. C., Gutmark, E. J., Koshigoe, S., and Wilson, K. J. (1989). “Combustion-related shear-flow dynamics in elliptic supersonic jets.” AIAA J., 27(10), 1347–1353.
Takama, Y., Suzuki, K., and Rathakrishnan, E. (2008). “Visualization and size measurement of vortex shed by flat and arc plates in an uniform flow.” Int. Rev. Aerosp. Eng., 1(1), 55–60.
Tam, C. K. W. (1995). “Supersonic jet noise.” Annu. Rev. Fluid Mech., 27(1), 17–43.
Verma, S. B., Sudhakar, S., and Venkatakrishnan, L. (2010). “Experimental study on a jet issuing from an elliptic nozzle with cylindrical tabs.” J. Turbul., 11(20), 1–24.
Vinay, C., Aravindh Kumar, S. M., and Rathakrishnan, E. (2015a). “Elliptic jet control with cross-wire.” Proc. Inst. Mech. Eng. Part G J. Aerosp. Eng., 229(10), 1868–1885.
Vinay, C., Aravindh Kumar, S. M., and Rathakrishnan, E. (2015b). “Mixing characteristics of underexpanded elliptic sonic jets from orifice and nozzle.” J. Propul. Power, 31(2), 496–504.
Vinay, C., Aravindh Kumar, S. M., and Rathakrishnan, E. (2016). “Aspect ratio effect on elliptical sonic jet mixing.” Aeronaut. J., 120(1230), 1197–1214.
Yoon, J., and Lee, S. (2003). “Investigation of the near-field structure of an elliptic jet using stereoscopic particle image velocimetry.” Meas. Sci. Technol., 14(12), 2034–2046.
Zaman, K. B. M. Q. (1994). “Effect of delta tabs on mixing and axis switching in jets from asymmetric nozzles.” Proc., 32nd Aerospace Sciences Meeting and Exhibit, AIAA, Reno, NV.
Zaman, K. B. M. Q. (1996). “Axis switching and spreading of an asymmetric jet: The role of coherent structure dynamics.” J. Fluid Mech., 316(1), 1–27.
Zaman, K. B. M. Q., Reeder, M. F., and Samimy, M. (1994). “Control of an axisymmetric jet using vortex generators.” Phys. Fluids, 6(2), 778–793.
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Published In
Journal of Aerospace Engineering
Volume 30 • Issue 5 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 14, 2016
Accepted: Mar 7, 2017
Published online: May 31, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 31, 2017
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