Effects of air-assist on the dynamics of a liquid fuel jet-in-crossflow at elevated temperatures and pressures

Z. P. Tan*, E. Lubarsky, O. Bibik, D. Shcherbik, B. T. Zinn

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

Modern gas-turbines employ fuel-air mixers that utilize jet-in-cross-flow (JICF) fuel-injection to achieve rapid fuel-air mixing. In recent years, air-assist JICF has been investigated to improve the atomization and fuel-dispersion qualities of JICF. This paper describes an experimental investigation of the effects of air-assist and momentum-ratio (J) upon the dynamics of JICF sprays at elevated pressures and temperatures. In the investigation, the liquid Jet-A was injected through a wall-recessed orifice, while four slots surrounding the base of the recess supplied air streams that impinged on the jet at 45o. Two arrangements of 10kHz high-speed Mie-scattering imaging were applied to capture the resulting spray plume: (1) simultaneous capture of the plume’s integrated Mie-scattering from the top and side-views, and (2) capture of planar Mie-scattering across two different cross-sectional slices of the plume. The resulting images were post-processed using a newly developed Moments-algorithm that described each instantaneous spray plume’s trajectory and dispersion in 3-dimensional space, as well as the fluctuation magnitudes of the plume’s trajectories in time. The Moments-algorithm is also capable of digitally reconstructing and animating a sequence of instantaneous spray plumes in 3D, which serves as a useful visualization tool for engine designers and CFD validation. The investigation found that air-assist moderately enhanced spray penetrations, while significantly increasing the spray plumes’ lateral widths and fluctuations.

Original languageEnglish
StatePublished - 2015
Event13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015 - Tainan, Taiwan
Duration: 23 Aug 201527 Aug 2015

Conference

Conference13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015
CountryTaiwan
CityTainan
Period23/08/1527/08/15

Keywords

  • 3D reconstruction
  • Air-assist
  • Dispersion
  • Dynamics
  • Experimental
  • High pressure
  • High temperature
  • Jet-A
  • Jet-in-crossflow
  • Liquid
  • Trajectories

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