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Corrugated Limiting Tab for Supersonic Jet Mixing

Anuj Bajpai(1), E. Rathakrishnan(2*)

(1) Indian Institute of Technology Kanpur, India
(2) Indian Institute of Technology Kanpur, India
(*) Corresponding author



The mixing efficiency of limiting tabs of three geometries with triangular corrugations, in promoting the mixing of a Mach 2 elliptic jet has been studied. Limiting tabs of rectangular, triangular and circular-arc geometries with 5% blockage are placed along major and minor axis at the nozzle exit are tested for nozzle pressure ratio from 4 to 8 in steps of one. All the tabs are found to be efficient mixing promoter at all tested NPRs, when placed along major axis at the nozzle exit. However at NPR 4 and 5 circular-arc tab along minor axis is found to retard the near field jet mixing. But the corrugated rectangular tab along minor axis is found to be the best mixing promoter among tested geometries. It causes a maximum reduction of 89% in core length at NPR 6. The corresponding core length reduction for corrugated triangular and circular-arc tab is 78% and 84% respectively. The maximum reduction in core length obtained for corrugated triangular and circular arc tab is found when placed along major axis at the exit of elliptical nozzle. The shadowgraph pictures of the jet reveal that the waves prevailing in the elliptic jet controlled with corrugated limiting tabs along major axis are significantly weaker than those in uncontrolled and controlled (with tabs along minor axis) elliptic jet.
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Supersonic; Limiting Tab; Elliptic Jet; Tab Geometry; Expansion Level

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Gutmark, E.J., Schadow, K.C. and Yu, K.H. Mixing enhancement in supersonic free shear flows, Annual Review of Fluid Mechanics, 1995, 27, (1), pp. 375-417.

Gutmark, E.J. and Grinstein, F.F. Flow Control with non-circular jets, Annual Review of Fluid Mechanics, 1999, 31, pp. 239-272.

Seiner, J .M., Dash, S.M. and Kenzakowski, D.C. Historical survey on enhanced mixing in Scramjet engines, Journal of Propulsion and power, 2001, 17, (6), pp. 1273-1286.

Knowles, K. and Saddington, A.J. A review of jet mixing enhancement for aircraft propulsion applications, Proceedings of the IMechE, Part G: J: Aerospace Engineering, 2006, 220, (2), pp. 103-127.

Ibrahim, M.K., Kunimura, R. and Nakamura, Y. Mixing enhancement of compressible jets by using unsteady micro jets as actuators, AIAA J, 2002, 40, (4), pp. 681-688.

Arakeri, V.H., Krothapalli, A., Siddavaram., V., Alkislar, M.B. and Lourenco, L.M. On the use of microjets to suppress turbulence in a Mach 0.9 axis-symmetric jet, Journal of Fluid Mechanics, 2003, 490, pp. 75-98.

Thomas, C., Bra, J-C. andSunyach, M. Noise reduction of a Mach 0.7-0.9 jet by impinging microjets, Computer RendusMcanique, 2006, 334, (2), pp. 98-104.

Thomas, C., Sunyach, M., Juv, D. and Bera, J-C. Jet noise reduction by impinging microjets: An acoustic investigation testing micro jet parameters, AIAA J, 2008, 46, (5), pp. 1081-1087.

Davis, M.R. Variable control jet decay, AIAA J, 2008, 46, (5), pp. 1081-1087.

Chauvet, N., Deck, S. and Jacquin, L. Numerical study of mixing enhancement in supersonic round jet, AIAA J, 2007, 45, (7), pp. 1675-1687.

Chauvet, N., Deck, S. and Jacquin, L. Shock patterns in an slightly underexpanded sonic jet controlled by radial injections, Physics of Fluids, 2007, 19, (4).

Behrouzi, P., Feng, T and Mcguirk, J.J. Active flow control of jet mixing using steady and pulsed fluid tabs, Proc. IMechE, Part I: J. Sytems and control Engineering, 2008, 222, (5), pp. 381-389.

Kamran, M.A. and Mcguirk, J.J. Subsonoc jet mixing via active control using steady and pulsed control jets, AIAA J, 2011, 49, (4), pp. 712-724.

Wan, C. and Yu, S.C.M. Numerical investigation of the air tabs technique in jet flow, J Propulsion and Power, 2013, 19, (1), pp. 42-49.

Wan, C. and Yu, S.C.M. Investigation of the air tabs effect in supersonic jet, J Propulsion and Power, 2011, 27, (1), pp. 1157-1160.

Yu, S.C.M., Lim., K.S. Chao, W. and Goh, X.P. Mixing enhancement in subsonic jet flow using air-tab technique, AIAA J, 2008, 46, (11), pp. 2966-2969.

Viets, H. Flip-flop jet nozzle, AIAA J, 1975, 13, (10), pp. 1375-1379.

Tam, C.K.W. and Morris, P.J. Tone excited jets, Part V: A theoretical model and comparison with experiment, J Sound and Vibration, 1985, 102, (10), pp. 119-151.

Wiltze, J.M. and Glezer, A. Direct excitation of small scale motions in free shear flow, Physics of Fluids, 1998, 10, (8), pp. 2026-2036.

Chanaud, R.C. Effects of geometry on the resonance frequency of Helmoltz resonator, J Sound and Vibration, 1994, 3, (178), pp. 337-348.

Panton, R.L. Effect of orifice geometry on Helmoltz resonator excitation by grazing flow, AIAA J, 1990, 28, (1), pp. 60-65.

Bradbury, L.J.S, and Khadem, A. H., “The Distortion of a Jet by Tabs,” Journal of Fluid Mechanics, Vol. 70, No. 4, 1975, pp. 801-813.

Ahuja, K. K., and Brown, W. H., “Shear Flow Control by Mechanical Tabs,” AIAA Paper 89-0994, 1989.

Samimy, M., Reeder, M. F. and Zaman, K.B.M.Q. Supersonic jet mixing enhancement by vortex generations, AIAA J, 91-2263, 1991.

Samimy, M., Zaman, K.B.M.Q. and Reeder, M. F. Effect of the tabs on the flow and noise field of an axisymmetric jet, AIAA J, 1993, 31, (4), pp. 609-619.

Zaman, K.B.M.Q., Reeder, M. F. and Samimy, M. Supersonic jet mixing enhancement by delta tabs, AIAA Paper 92-3548, 1992.

Bohl, D., and Foss, J. F., “Enhancement of Passive Mixing Tabs by the Addition of Secondary Tabs,” AIAA Paper 96-054, 1996.

Wishart, D. P., Krothapalli. A., and Mungal, M. G., “Supersonic Jet Control Disturbances inside the Nozzle,” AIAA Journal, Vol. 31, No. 7, 1993, pp. 1340-1341.

Zaman, K. B. M. Q., Reeder, M. F., and Samimy, M., “Control of an Axisymmetric Jet Using Vortex Generators, “Physics of Fluids, Vol. 6, 1994, pp. 778-793

Zaman, K. B. M. Q., “Streamwise Vorticity Generation and Mixing Enhancement in Free Jets by Delta-Tabs”, AIAA Paper 93-3253, 1993.

Stefen, C. J., Reddy. D.R. and Zaman, K. B. M. Q., Numerical modeling of jet entrainment for nozzles fitted with delta tabs, AIAA paper 97-0709, 1997.

Reeder, M. F., and Samimy, M., “The Evolution of a Jet with Vortex- Generating Tabs : Real-Time Visualization and Quantitative Measurements,” Journal of Fluid Mechanics, Vol. 311, 1996, pp. 72-118.

Navin Kumar, S., and Rathakrishnan, E., “Sonic jet control with tabs”, Journal of Turbo and Jet Engines, Vol. 19, Nos. 1-2, 2002, pp. 107-118.

Sreejith, R. B., and Rathakrishnan, E., “Crosswire as passive device for supersonic jet control,” AIAA paper 2002-4052, 2002.

Rathakrishnan, E., “Experimental Studies on the Limiting Tab,” AIAA J. Vol. 47 (10), pp. 2475-2485.

Lovaraju, P., Paparao, K. P. V., and Rathakrishnan, E., “Shifted cross-wire for supersonic jet control paper 2004-4080, 2004.

Mrinal, K., Pankaj, S. T., and Rathakrishnan, E., “Studies on the effect of notches on circular sonic jet mixing,” Journal of Propulsion Power, Vol. 22, No. 1, 2006, pp. 211-214.

S. M. Aravindh Kumar and Ethirajan Rathakrishnan, “Characteristics of Controlled Mach 2 Elliptic Jet”, Journal of Propulsion and Power, Vol. 32, 2016, pp. 121-133, DOI: 10.2514/1.B35877.

P. Arun Kumar and Rathakrishnan E., “Triangular tabs for supersonic jet mixing enhancement,” The Aeronautical Journal, Vol. 118, No. 1209, November 2014, pp. 1245-1278.


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