Analysis of Ambient Gas Entrainment Processes in Intermittent Gas Jets by LIFA Technique

Paper #:
  • 960835

Published:
  • 1996-02-01
Citation:
Kido, A., Ueno, M., Ogawa, H., and Miyamoto, N., "Analysis of Ambient Gas Entrainment Processes in Intermittent Gas Jets by LIFA Technique," SAE Technical Paper 960835, 1996, https://doi.org/10.4271/960835.
Pages:
10
Abstract:
Time-resolved and local ambient gas entrainment processes in intermittent gas jets with a range of injection conditions were evaluated by a LIFA (Laser-Induced Fluorescence of Ambient gas) technique. The gas injection conditions tested were: mean discharge velocity, um; mean discharge turbulence intensity, u′m; kinematic viscosity of the gas jet, ν; specific gravity of the gas jet, ρj; and of the ambient gas, ρa. Experimental results showed that the entrainment of jets are enhanced with higher eddy kinematic viscosity, νt, measured by a hot wire anemometer. In conclusion, the mean jet concentration was approximated with only one parameter, (ρj/ρa)D2/[(ν+νt)Δt].
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