Manipulation of Supersonic Jet using Grooved Tabs

Document Type : Regular Article


1 Department of Aerospace Engineering, Indian Institute of Technology, Kharagpur – 721302, India

2 Department of Aerospace Engineering, B.M.S. College of Engineering, Bengaluru - 560019, India

3 Department of Aerospace Engineering, MIT Campus, Anna University, Chennai – 600044, India



This study experimentally evaluated the mixing augmentation of twin tabs mounted along a diameter at the outlet of a convergent-divergent Mach 1.62 circular nozzle. The usefulness of the plain and grooved tabs is examined at various expansion levels prevailing at nozzle outlet. The tab's performance is assessed through pitot pressure distribution measured along and perpendicular to the jet centerline at different nozzle pressure ratios (NPRs). The shadowgraph technique visualized the shocks and expansion fans in uncontrolled and controlled jets. With the introduction of uncorrugated or plain tabs at the nozzle outlet operating under overexpanded conditions corresponding to NPR 4, the supersonic length (SL) was decreased only by 35.4%. On the other hand, the corrugated or grooved tabs under similar conditions decreased the SL substantially. Interestingly, the performance of grooved tabs was best at underexpanded conditions associated with NPR 6, where the SL was reduced by about 88%. The pressure profiles also established the superiority of tabs with grooved edges in mixing augmentation without introducing any significant asymmetry to the flow field. In addition, the Shadowgraph images also confirmed the weakening of shock strength and reduction of shock-cell length in the case of grooved tabs at the nozzle exit compared to the plain nozzle.


Main Subjects

Ahuja, K. K., & Brown, W. H. (1989). Shear flow control by mechanical tabs. AIAA 2nd Shear Flow Conference, 1989.
Behrouzi, P., & Mcguirk, J. J. (1998). Experimental studies of tab geometry effects on mixing enhancement of an axisymmetric jet. JSME International Journal Series B, 41(4), 908–917.
Behrouzi, P., & McGuirk, J. J. (2006). Effect of tab parameters on near-field jet plume development. Journal of Propulsion and Power, 22(3), 576–585.
Brown, G. L., & Roshko, A. (1974). On density effects and large structure in turbulent mixing layers. Journal of Fluid Mechanics, 64(4), 775–816.
Gretta, W. J., & Smith, C. R. (1993). The flow structure and statistics of a passive mixing tab. Journal of Fluids Engineering, Transactions of the ASME, 115(2), 255–263.
Habchi, C., Lemenand, T., Valle, D. Della, & Peerhossaini, H. (2010). Turbulence behavior of artificially generated vorticity. Journal of Turbulence, 11(November 2020), 1–10.
Hari, S., & Kurian, J. (2001). Effectiveness of secondary tabs for supersonic mixing. Experiments in Fluids, 31(3), 302–308.
Ilakkiya, S., & Sridhar, B. T. N. (2018). An experimental study on the effect of square grooves on decay characteristics of a supersonic jet from a circular nozzle. Journal of Mechanical Science and Technology, 32(10), 4721–4729.
Ilakkiya, S., & Sridhar, B. T. N. (2022). Study of decay, spread, and shock structure of a supersonic jet issuing from a C-D nozzle with semi-circular grooves. Thermophysics and Aeromechanics, 29(3), 327–346.
Jana, T., & Kaushik, M. (2021). Performance of corrugated actuator-tabs of aspect ratio 2.0 on supersonic jet mixing enhancement. Journal of Mechanical Science and Technology, 35(3), 1087–1097.
Karabasov, S. A. (2010). Understanding jet noise. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 368(1924), 3593–3608.
Kaushik, M. (2012). Innovative passive control techniques for supersonic jet mixing (1 st ed.). Lambert Academic Publishing.
Kaushik, M. (2019). Theoretical and experimental aerodynamics (1st ed.). Springer Singapore.
Kaushik, M. (2022). Fundamentals of gas dynamics (1st ed). Springer Singapore.
Kaushik, M., & Rathakrishnan, E. (2013). Corrugated limiting tab for jet mixing. International Journal of Turbo and Jet-Engines, 30(4), 359–373.
Kaushik, M., & Rathakrishnan, E. (2014). Corrugated tabs for supersonic jet mixing. International Review of Mechanical Engineering, 8(6), 983–991.
Kaushik, M., & Rathakrishnan, E. (2015). Tab aspect ratio effect on supersonic jet mixing. International Journal of Turbo & Jet-Engines, 32(3), 265–273.
Kaushik, M., Thakur, P. S., & Rathakrishnan, E. (2006). Studies on the Effect of Notches on Circular Sonic Jet Mixing. Journal of Propulsion and Power, 22(1), 211–214.
Bradbury, L. J. S., & Khadem, A. H. (1975). The distortion of a jet by tabs. Journal of Fluid Mechanics, 70(4), 801–813.
Lovaraju, P., & Rathakrishnan, E. (2006). Subsonic and transonic jet control with cross-wire. AIAA Journal, 44(11), 2700–2705.
Martens, S., Kinzie, K. W., & McLaughlin, D. K. (1994). Measurements of Kelvin-Helmholtz instabilities in a supersonic shear layer. AIAA Journal, 32(8), 1633–1639.
Papamoschou, D., & Roshko, A. (1988). The compressible turbulent shear layer: an experimental study. Journal of Fluid Mechanics, 197(1973), 453–477.
Reeder, M. F., & Samimy, M. (1996). The evolution of a jet with vortex-generating tabs: Real-time visualization and quantitative measurements. Journal of Fluid Mechanics, 311, 73–118.
Samimy, M., Zaman, K. B. M. Q., & Reeder, M. F. (1993). Effect of tabs on the flow and noise field of an axisymmetrie jet. AIAA Journal, 31(4), 609–619.
Shirie, J. W., & Seubold, J. G. (1967). Length of the supersonic core in high-speed jets. AIAA Journal, 5(11), 2062–2064.
Tew, D. E., Hermanson, J. C., & Waitz, I. A. (2004). Impact of compressibility on mixing downstream of lobed mixers. AIAA Journal, 42(11), 2393–2396.
Thangaraj, T., Kaushik, M., Deb, D., Unguresan, M., & Muresan, V. (2022). Survey on vortex shedding tabs as supersonic jet control. Frontiers in Physics, 9(February), 1–17.
Thillaikumar, T., Bhale, P., & Kaushik, M. (2020a). Experimental investigations on the strut controlled thrust vectoring of a supersonic nozzle. Journal of Applied Fluid Mechanics, 13(4), 1223–1232.
Thillaikumar, T., Jana, T., & Kaushik, M. (2020b). Experimental assessment of corrugated rectangular actuators on supersonic jet mixing. Actuators, 9(3), 1–24.
Zaman, B., Reeder, M., & Samimy, M. (1992, July 6). Supersonic jet mixing enhancement by “delta-tabs.” 28th Joint Propulsion Conference and Exhibit.
Zaman, K. B. M. Q., Reeder, M. F., & Samimy, M. (1994). Control of an axisymmetric jet using vortex generators. Physics of Fluids, 6(2), 778–793.
  • Received: 18 September 2023
  • Revised: 12 December 2023
  • Accepted: 19 December 2023
  • Available online: 24 February 2024