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Spray jet penetration and distribution of modulated liquid jets in subsonic cross-flows

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Abstract

Modulated liquid jets injected into subsonic cross-flows are empirically studied by using a mechanical liquid jet modulation apparatus. Experimental investigations were conducted using water over a range of cross-flow velocities from 5 m/s to 143 m/s and with modulated liquid jet frequencies from 35.7 Hz to 166.2 Hz and so on. PDPA(phase Doppler particle anemometry) was employed to measure droplet diameter and velocity with various spray cross-sections from Z/d=20 to Z/d=60. The spray structure, penetration depth, SMD(Sauter mean diameter), volume flux and velocity characteristics of modulated liquid jets injected into cross-flows were examined. As oscillation of the periodic pressure that could make liquid jet moved up and down in cross-flow field, the mixing process was facilitated. This phenomenon has the advantage of mixing the spray concentration from the center area to the outer area. Also, a bulk liquid jet puff was detected in the upper field of the liquid jet surface. The modulation effect appears significant in the extent of the spray oscillation. The correlation equations for the liquid jet boundary of the upper and lower regions which related to the Strouhal number have been presented to predict the spray structure under modulation conditions. Because of the modulation frequency, an inclination of averaged SMD for the structured layer was evanescent which contributed to the promotion of the macroscopic spray mixing process. Cross-sectional characteristics of SMD had the same tendency over a range of various modulation frequencies. As the modulation frequency increased, the region of volume flux distribution also increased.

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Authors and Affiliations

  1. Graduate Student of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang, Korea

    In Chul Lee & Young Su Kang

  2. School of Aerospace and Mechanical Engineering, Korea Aerospace University, Goyang-city, Gyeonggi-do, 412-791, Korea

    Hee Jang Moon, Seok Pil Jang, Jin Kon Kim & Jaye Koo

Authors
  1. In Chul Lee
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  2. Young Su Kang
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  3. Hee Jang Moon
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  4. Seok Pil Jang
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  5. Jin Kon Kim
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  6. Jaye Koo
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Corresponding author

Correspondence to Jaye Koo.

Additional information

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

In Chul Lee received his B.S and M.S. degree in Aerospace and Mechanical Engineering from Korea Aerospace University in 2006 and 2008. Mr. Lee is currently working on his Ph.D. thesis at the Propulsion and Combustion Control Lab. at the department of Aerospace and Mechanical Engineering, Korea Aerospace University. His research interests include spray combustion and aerospace propulsion.

Jaye Koo received his B.S. degree in Aerospace and Mechanical Engineering from Korea Aerospace University in 1981. He received his M.S. degree in Aeronautical Engineering from Seoul National University in 1983. He received his Ph.D. degree in Mechanical Engineering from University of Wisconsin-Madison in 1991. He is currently a professor at the School of aerospace and mechanical engineering, Korea Aerospace University. His research interests are in the area of spray combustion and aerospace propulsion.

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Lee, I.C., Kang, Y.S., Moon, H.J. et al. Spray jet penetration and distribution of modulated liquid jets in subsonic cross-flows. J Mech Sci Technol 24, 1425–1431 (2010). https://doi.org/10.1007/s12206-010-0418-0

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  • DOI: https://doi.org/10.1007/s12206-010-0418-0

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