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Spray formation by like-doublet impinging jets in low speed cross-flows

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Abstract

Breakup and spray formation by impinging liquid jets introduced into a low-speed cross-flow are experimentally investigated. Effects of the cross-flows on the macroscopic and microscopic spray parameters are optically measured in terms of jet Weber number and liquid-to-gas momentum ratio. The liquid stream undergoes Rayleigh jet breakup at lower jet Weber numbers and bag/plume breakup at higher momentum ratio through Kelvin-Helmholtz instability. In particular, the first and the second wind breakup occur at an intermediate jet Weber number. At higher jet Weber numbers, the hydrodynamic impact waves commands and the effect of the convective gas flows is insignificant. The breakup length rises in proportion to the jet Weber number, but starts to decrease when the jet Weber number further rises over 1000. The cross-flow promotes the jet breakup and renders a finer spray in an entire range of injection velocities.

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Authors and Affiliations

  1. Korea Military Academy, Seoul, Korea, 139-799

    S. S. Lee

  2. Department of Mechanical Engineering, Yonsei University, Seoul, Korea, 120-749

    W. H. Kim & W. S. Yoon

Authors
  1. S. S. Lee
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  2. W. H. Kim
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  3. W. S. Yoon
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Corresponding author

Correspondence to W. S. Yoon.

Additional information

This paper was recommended for publication in revised form by Associate Editor Gihun Son

Woong-Sup Yoon is a Professor in the School of Mechanical Engineering at Yonsei University. His current research interests are in wave instabilities, unusual spray formation, emission control, and propulsion system modeling. He received a BS degree from the Department of Mechanical Engineering, Yonsei University, in 1985; an MS degree from the Department of Mechanical Engineering, University of Missouri-Rolla, in 1989; and a Ph.D degree from the Department of Mechanical and Aerospace Engineering, the Unversity of Alabama in Huntsville, in 1992.

Sang-seung Lee received his B.S. degree in Weapons Engineering from Korea Military Academy, Korea, in 2002. He then received his M.S. degrees from Yonsei University, in 2006. Mr. Lee is currently a Lecturer at the School of Weapons Engineering at Korea Military Academy in Seoul, Korea. He serves as an Editor of the Journal of Mechanical Science and Technology. Mr. Lee’s research interests include Ramjet, Atomization of injector.

Won-ho Kim received his B.S. degree in Mechanical Engineering from Yonsei University, Korea, in 2003. Mr. Kim has then gone on to do graduate work at the Ph.D in the School of Mechanical Engineering at Yonsei University in Seoul, Korea. Mr. Kim’s research interests include Atomization of 2phase flow and Dust collection efficiency.

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Lee, S.S., Kim, W.H. & Yoon, W.S. Spray formation by like-doublet impinging jets in low speed cross-flows. J Mech Sci Technol 23, 1680–1692 (2009). https://doi.org/10.1007/s12206-009-0419-z

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  • DOI: https://doi.org/10.1007/s12206-009-0419-z

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