Skip to main content Accessibility help
×
Home

Structural and stability characteristics of jets in crossflow

  • D. R. Getsinger (a1), L. Gevorkyan (a1), O. I. Smith (a1) and A. R. Karagozian (a1)

Abstract

This experimental study examines the relationship between transverse jet structural characteristics and the shear layer instabilities forming on the upstream side of the jet column. Jets composed of mixtures of helium and nitrogen were introduced perpendicularly into a low-speed wind tunnel using several alternative injectors: convergent circular nozzles mounted either flush with or elevated above the tunnel floor, and a flush-mounted circular pipe. Both non-intrusive optical diagnostics (planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV)) and intrusive probe-based (hot-wire anemometry) measurements were used to explore a range of jet-to-crossflow momentum flux ratios and density ratios for which previous studies have identified upstream shear layer transition from convective to absolute instability. Remarkable correspondences were identified between formation of the well-known counter-rotating vortex pair (CVP) associated with the jet cross-section and conditions producing strong upstream shear layer vorticity rollup, arising typically from absolute instability in the shear layer. In contrast, asymmetries in the jet mean cross-sectional shape and/or lack of a clear CVP were observed to correspond to weaker, convectively unstable jet shear layers.

Copyright

Corresponding author

Email address for correspondence: ark@seas.ucla.edu

References

Hide All
Alves, L. S. de B., Kelly, R. E. & Karagozian, A. R. 2008 Transverse-jet shear-layer instabilities. Part 2. Linear analysis for large jet-to-crossflow velocity ratio. J. Fluid Mech. 602, 383401.
Andreopoulos, J. 1985 On the structure of jets in a crossflow. J. Fluid Mech. 157, 163197.
Beresh, S. J., Henfling, J. F., Erven, R. J. & Spillers, R. W. 2006 Crossplane velocimetry of a transverse supersonic jet in a transonic crossflow. AIAA J. 44, 30513061.
Camussi, R., Guj, G. & Stella, A. 2002 Experimental study of a jet in a crossflow at very low Reynolds number. J. Fluid Mech. 454, 113144.
Cortelezzi, L. & Karagozian, A. R. 2001 On the formation of the counter-rotating vortex pair in transverse jets. J. Fluid Mech. 446, 347373.
Davitian, J., Getsinger, D., Hendrickson, C. & Karagozian, A. R. 2010 Transition to global instability in transverse-jet shear layers. J. Fluid Mech. 661, 294315.
Fric, T. F. & Roshko, A. 1988 Views of the transverse jet near field. Phys. Fluids 31 (9), 2390.
Fric, T. F. & Roshko, A. 1994 Vortical structure in the wake of a transverse jet. J. Fluid Mech. 279, 147.
Getsinger, D. R.2012 Shear layer instabilities and mixing in variable density transverse jet flows. PhD thesis, University of California, Los Angeles.
Getsinger, D. R., Hendrickson, C. & Karagozian, A. R. 2012 Shear layer instabilities in low-density transverse jets. Exp. Fluids 53, 783801.
Huerre, P. & Monkewitz, P. A. 1990 Local and global instabilities in spatially developing flows. Annu. Rev. Fluid Mech. 22, 473537.
Jendoubi, S. & Strykowski, P. J. 1994 Absolute and convective instability of axisymmetric jets with external flow. Phys. Fluids 6, 30003009.
Kamotani, Y. & Greber, I. 1972 Experiments on a turbulent jet in a cross flow. AIAA J. 10 (11), 14251429.
Karagozian, A. R. 2010 Transverse jets and their control. Prog. Energy Combust. Sci. 36, 531553.
Karagozian, A. R. 2014 The jet in crossflow. Phys. Fluids 26, 101303.
Kelso, R. M., Lim, T. T. & Perry, A. E. 1996 An experimental study of round jets in cross-flow. J. Fluid Mech. 306, 111144.
Kelso, R. M. & Smits, A. J. 1995 Horseshoe vortex systems resulting from the interaction between a laminar boundary layer and a transverse jet. Phys. Fluids 7, 153158.
Kuzo, D. M.1995 An experimental study of the turbulent transverse jet. PhD thesis, California Institute of Technology.
Lim, T. T., New, T. H. & Luo, S. C. 2001 On the development of large-scale structures of a jet normal to a cross flow. Phys. Fluids 13 (3), 770775.
Lozano, A.1992 Laser-excited luminescent tracers for planar concentration measurements in gaseous jets. PhD thesis, Stanford University, Department of Mechanical Engineering.
Lozano, A., Yip, B. & Hanson, R. K. 1992 Acetone: a tracer for concentration measurements in gaseous flows by planar laser-induced fluorescence. Exp. Fluids 13, 369376.
Mahesh, K. & Iyer, P. 2013 Numerical study of shear layer instability in transverse jets. Bull. Am. Phys. Soc. 58 (18), 174.
Margason, R. J.1993 Fifty years of jet in cross flow research. AGARD-CP-534, vol. 1, pp. 1–41.
Megerian, S., Davitian, J., Alves, L. S. de B. & Karagozian, A. R. 2007 Transverse-jet shear-layer instabilities. Part 1. Experimental studies. J. Fluid Mech. 593, 93129.
Moussa, Z. M., Trischka, J. W. & Eskinazi, S. 1977 The nearfield in the mixing of a round jet with a cross-stream. J. Fluid Mech. 80, 4980.
Muldoon, F. & Acharya, S. 2010 Direct numerical simulation of pulsed jets in crossflow. Comput. Fluids 39, 17451773.
Muppidi, S. & Mahesh, K. 2007 Direct numerical simulation of round turbulent jets in crossflow. J. Fluid Mech. 574, 5984.
Narayanan, S., Barooah, P. & Cohen, J. M. 2003 Dynamics and control of an isolated jet in crossflow. AIAA J. 41 (12), 23162330.
New, T. H., Lim, T. T. & Luo, S. C. 2006 Effects of jet velocity profiles on a round jet in cross-flow. Exp. Fluids 40, 859875.
Poling, B. E., Prausnitz, J. M. & O’Connell, J. P. 2001 The Properties of Gases and Liquids, 5th edn. McGraw-Hill.
Shan, J. & Dimotakis, P. 2006 Reynolds-number effects and anisotropy in transverse-jet mixing. J. Fluid Mech. 566, 4796.
Smith, S. H. & Mungal, M. G. 1998 Mixing, structure and scaling of the jet in crossflow. J. Fluid Mech. 357, 83122.
Su, L. K. & Mungal, M. G. 2004 Simultaneous measurements of scalar and velocity field evolution in turbulent crossflowing jets. J. Fluid Mech. 513, 145.
Thurber, M. C., Grisch, F., Kirby, B. J., Votsmeier, M. & Hanson, R. K. 1998 Measurements and modeling of acetone laser-induced fluorescence with implications for temperature-imaging diagnostics. Appl. Opt. 37, 49634978.
Yuan, L. L. & Street, R. L. 1998 Trajectory and entrainment of a round jet in crossflow. Phys. Fluids 10, 23232335.
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

JFM classification

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed