Abstract
High-resolution particle image velocimetry measurements of coupled underexpanded twin-jets are presented. Two nozzle pressure ratios are examined, which are selected due to a change in coupled plume mode indicated by a discontinuous jump in screech frequency. Estimates of the turbulent flow statistics, shear-layer thickness, merge point, inter-nozzle mixing, and integral length scales are provided. The higher nozzle pressure ratio case shows a strong standing-wave present in the velocity fluctuation amplitude and integral length scale. The ratios of standing, acoustic, and hydrodynamic wavelength are compared and find a close fit to Panda’s relation for screech. This indicates that screech in the twin-jet system operates with similar length-scale and frequency characteristics to single jets and provides evidence to suggest screech is an integral part of the twin-jet coupling process. Second-order spatial velocity correlation maps reveal the larger modal structure. A symmetric mode is found for the higher pressure ratio and a weakly symmetric mode for the lower. Comparison is made between where the standing-wave is present and where it is not. It is found that the standing-wave, not the shock structure, is the driver of turbulence coherence modulation near the jet. In regions that are affected only by the standing-wave, it is found that it contributes to both the turbulence intensity and coherence modulation.
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References
Alkislar MB, Krothapalli A, Lourenco LM (2003) Structure of a screeching rectangular jet: A stereoscopic particle image velocimetry study. Journal of Fluid Mechanics 489(489):121–154. https://doi.org/10.1017/S0022112003005032
Alkislar MB, Krothapalli A, Choutapalli I, Lourenco L (2005) Structure of Supersonic Twin Jets. AIAA journal 43(11):2309–2318. https://doi.org/10.2514/1.10431
André B, Castelain T, Bailly C (2014) Investigation of the mixing layer of underexpanded supersonic jets by particle image velocimetry. International Journal of Heat and Fluid Flow 50:188–200. https://doi.org/10.1016/j.ijheatfluidflow.2014.08.004
Benedict LH, Gould RD (1996) Towards better uncertainty estimates for turbulence statistics. Experiments in Fluids 22(2):129–136. https://doi.org/10.1007/s003480050030
Berndt DE (1984) Dynamic Pressure Fluctuations in the Internozzle Region of a Twin-Jet Nacelle. In: SAE Technical Paper, Society of Automotive Engineers, p 10, https://doi.org/10.4271/841540
Bogey C, Gojon R (2017) Feedback loop and upwind-propagating waves in ideally expanded supersonic impinging round jets. Journal of Fluid Mechanics 823:562–591. https://doi.org/10.1017/jfm.2017.334
Bogey C, Marsden O, Bailly C (2012) Influence of initial turbulence level on the flow and sound fields of a subsonic jet at a diameter-based Reynolds number of 105. Journal of Fluid Mechanics 701:352–385. https://doi.org/10.1017/jfm.2012.162
Davis MG, Oldfield DES (1962) Tones from a choked axisymmetric jet. I. Cell structure, eddy velocity and source locations and II. The self excited loop and mode of oscillation. Acustica 12(4):257–277
Edgington-Mitchell D, Oberleithner K, Honnery DR, Soria J (2014) Coherent structure and sound production in the helical mode of a screeching axisymmetric jet. Journal of Fluid Mechanics 748:822–847. https://doi.org/10.1017/jfm.2014.173
Edgington-Mitchell D, Honnery D, Soria J (2015) Staging behaviour in screeching elliptical jets. International Journal of Aeroacoustics 14(7):1005–1024. https://doi.org/10.1260/1475-472X.14.7-8.1005
Fleury V, Bailly C, Jondeau E, Michard M, Juvé D (2008) Space-Time Correlations in Two Subsonic Jets Using Dual Particle Image Velocimetry Measurements. AIAA Journal 46(10):2498–2509. https://doi.org/10.2514/1.35561
Gao J, Xu X, Li X (2016) Numerical Simulation of Supersonic Twin-Jet Noise with High Order Finite Difference Scheme. 22nd AIAA/CEAS Aeroacoustics Conference pp 1–14, https://doi.org/10.2514/6.2016-2938
Gojon R, Bogey C (2017) Numerical study of the flow and the near acoustic fields of an underexpanded round free jet generating two screech tones. International Journal of Aeroacoustics 16(7–8):603–625. https://doi.org/10.1177/1475472X17727606
Goparaju K, Gaitonde DV (2017) Dynamics of Closely Spaced Supersonic Jets. Journal of Propulsion and Power pp 1–13, https://doi.org/10.2514/1.B36648
Knast T, Bell G, Wong M, Leb CM, Soria J, Honnery DR, Edgington-Mitchell D (2018) Coupling Modes of an Underexpanded Twin Axisymmetric Jet. AIAA Journal pp 1–12, https://doi.org/10.2514/1.J056434
Kuo CW, Cluts J, Samimy M (2017a) Effects of excitation around jet preferred mode Strouhal number in high-speed jets. Experiments in Fluids 58(4):35. https://doi.org/10.1007/s00348-017-2329-7
Kuo CW, Cluts J, Samimy M (2017c) Exploring Physics and Control of Twin Supersonic Circular Jets. AIAA Journal 55(1):68–85. https://doi.org/10.2514/1.J054977
Lin YF, Sheu MJ (1991) Interaction of parallel turbulent plane jets. AIAA Journal 29(9):1372–1373. https://doi.org/10.2514/3.10749
Mercier B, Castelain T, Bailly C (2017) Experimental characterisation of the screech feedback loop in underexpanded round jets. Journal of Fluid Mechanics 824:202–229. https://doi.org/10.1017/jfm.2017.336
Mitchell D, Honnery D, Soria J (2011) Particle relaxation and its influence on the particle image velocimetry cross-correlation function. Experiments in Fluids 51(4):933–947. https://doi.org/10.1007/s00348-011-1116-0
Morris PJ (1977) Flow characteristics of the large scale wave-like structure of a supersonic round jet. Journal of Sound and Vibration 53(2):223–244. https://doi.org/10.1016/0022-460X(77)90467-9
Morris PJ (1990) Instability waves in twin supersonic jets. Journal of Fluid Mechanics 220(1):293–307. https://doi.org/10.1017/S0022112090003263
Moustafa GH (1994) Experimental investigation of high-speed twin jets. AIAA journal 32(11):2320–2322. https://doi.org/10.2514/3.12293
Nicolaides D, Honnery DR, Soria J (2004) Autocorrelation Functions and the Determination of Integral Length with Reference to Experimental and Numerical Data. 15th Australasian Fluid Mechanics Conference 1(December):1–4
Panda J (1999) An experimental investigation of screech noise generation. Journal of Fluid Mechanics 378:71–96. https://doi.org/10.1017/S0022112098003383
Panickar P, Srinivasan K, Raman G (2004) Aeroacoustic features of coupled twin jets with spanwise oblique shock-cells. Journal of Sound and Vibration 278(1–2):155–179. https://doi.org/10.1016/j.jsv.2003.10.011
Panickar P, Srinivasan K, Raman G (2005) Nonlinear interactions as precursors to mode jumps in resonant acoustics. Physics of Fluids 17(9):1–18. https://doi.org/10.1063/1.2008995
Powell A (1954) The reduction of choked jet noise. Proceedings of the Physical Society Section B 67(4):313–327. https://doi.org/10.1088/0370-1301/67/4/306
Powell A, Umeda Y, Ishii R (1992) Observations of the oscillation modes of choked circular jets. The Journal of the Acoustical Society of America 92(5):2823–2836. https://doi.org/10.1121/1.404398
Raffel M, Willert CE, Wereley ST, Kompenhans J (2007) Particle Image Velocimetry, A Practical Guide, vol 6, 2nd edn. Springer Berlin Heidelberg, Heidelberg, New York, https://doi.org/10.1097/JTO.0b013e3182370e69, arXiv:1011.1669v3
Raman G (1998) Advances in Understanding Supersonic Jet Screech: Review and Perspective. Progress in Aerospace Sciences 34(1–2):45–106. https://doi.org/10.1016/S0376-0421(98)00002-5
Raman G (1999) Coupling of Twin Supersonic Jets of Complex Geometry. Journal of Fluid Mechanics 36(5):123–146. https://doi.org/10.2514/2.2523
Raman G, Panickar P, Chelliah K (2012) Aeroacoustics of twin supersonic jets: a review. International Journal of Aeroacoustics 11(7):957–984. https://doi.org/10.1260/1475-472X.11.7-8.957
Sadr R, Klewicki JC (2003) An experimental investigation of the near-field flow development in coaxial jets. Physics of Fluids 15(5):1233–1246. https://doi.org/10.1063/1.1566755
Seiner JM, Manning JC, Ponton MK (1986) Dynamic pressure loads associated with twin supersonic plume resonance. AIAA Journal 26(8):954–960. https://doi.org/10.2514/3.9996
Shaw L (1990) Twin-jet screech suppression. Journal of Aircraft 27(8):708–715. https://doi.org/10.2514/3.25344
Singh A, Chatterjee A (2007) Numerical prediction of supersonic jet screech frequency. Shock Waves 17(4):263–272. https://doi.org/10.1007/s00193-007-0110-1
Soria J (1996) An investigation of the near wake of a circular cylinder using a video-based digital cross-correlation particle image velocimetry technique. Experimental Thermal and Fluid Science 12(2):221–233. https://doi.org/10.1016/0894-1777(95)00086-0
Srinivasan K, Panickar P, Raman G, Kim BH, Williams DR (2009) Study of coupled supersonic twin jets of complex geometry using higher-order spectral analysis. Journal of Sound and Vibration 323(3–5):910–931. https://doi.org/10.1016/j.jsv.2009.01.011
Tam CKW (1995) Supersonic Jet Noise. Annu Rev Fluid Mech 27:17–43
Tan DJ, Soria J, Honnery D, Edgington-Mitchell D (2017) Novel Method for Investigating Broadband Velocity Fluctuations in Axisymmetric Screeching Jets. AIAA Journal 55(7):2321–2334. https://doi.org/10.2514/1.J055606
Tritton DJ (1977) Physical Fluid Dynamics. Oxford Science Publ, Clarendon Press, https://doi.org/10.1007/978-94-009-9992-3,arXiv:1011.1669v3
Weightman JL, Amili O, Honnery D, Edgington-Mitchell DM, Soria J (2016) Supersonic Jet Impingement on a Cylindrical Surface. In: 22nd AIAA/CEAS Aeroacoustics Conference, pp 2016–2800, https://doi.org/10.2514/6.2016-2800
Weightman JL, Amili O, Honnery D, Soria J, Edgington-Mitchell D (2017) An explanation for the phase lag in supersonic jet impingement. Journal of Fluid Mechanics 815:815R11–815R111, https://doi.org/10.1017/jfm.2017.37
Westley R, Woolley JH (1969) The near field sound pressures of a choked jet during a screech cycle. In: Agard Cp, American Institute of Aeronautics and Astronautics, Reston, Virigina, vol 42, pp 23.1–23.13, https://doi.org/10.2514/6.1975-479
Willert CE, Stockhausen G, Voges M, Klinner M, Schodl R, Hassa C, Schürmans B, Güthe F (2008) Particle Image Velocimetry: New Developments and Recent Applications, vol 112, 1st edn. Springer, Berlin Heidelberg
Wlezien R (1989) Nozzle geometry effects on supersonic jet interaction. AIAA Journal 27(10):1361–1367. https://doi.org/10.2514/3.10272
Yoo J, Mitchell D, Davidson DF, Hanson RK (2010) Planar laser-induced fluorescence imaging in shock tube flows. Experiments in Fluids 49(4):751–759. https://doi.org/10.1007/s00348-010-0876-2
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The authors would like to acknowledge the financial support of the Australian Research Council (ARC) and the computational resources of the Australian National Computational Infrastructure (NCI).
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Bell, G., Soria, J., Honnery, D. et al. An experimental investigation of coupled underexpanded supersonic twin-jets. Exp Fluids 59, 139 (2018). https://doi.org/10.1007/s00348-018-2593-1
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DOI: https://doi.org/10.1007/s00348-018-2593-1