Quantitative Measurements and Analysis of Ambient Gas Entrainment into Intermittent Gas Jets by Laser-Induced Fluorescence of Ambient Gas (LIFA)

930970

03/01/1993

Event
International Congress & Exposition
Authors Abstract
Content
Mixture formation processes of intermittent gas jets were visualized and quantified with high accuracy by a uniquely developed LIF technique (LIFA). Mixture strength inside gas jets was quantified by the fluorescence of iodine in the ambient gas excited by the sheet light of a Nd:YAG laser Two dimensional images of intermittent gas jets of various velocities were continuously recorded with VTR and quantified with high accuracy. The optimum conditions for measurements and accuracy with the LIFA technique were investigated. At the optimum setting of the initial iodine concentration in the ambient gas, accuracies better than 95% were obtained for the ambient gas entrainment ratio or jet concentration. The experimental results show that considerable amounts of ambient gas entrain just under the umbrella-like profile at the top of the jet. The mean jet concentration decreased with decreased nozzle diameter (D), and time elapsed after injection (Δt). The mean jet concentration was approximately related to only one parameter, the ratio of the discharge Reynolds number and discharge velocity of the jet, ReD/U0Δt).
Meta TagsDetails
DOI
https://doi.org/10.4271/930970
Pages
11
Citation
Kido, A., Ogawa, H., and Miyamoto, N., "Quantitative Measurements and Analysis of Ambient Gas Entrainment into Intermittent Gas Jets by Laser-Induced Fluorescence of Ambient Gas (LIFA)," SAE Technical Paper 930970, 1993, https://doi.org/10.4271/930970.
Additional Details
Publisher
Published
Mar 1, 1993
Product Code
930970
Content Type
Technical Paper
Language
English