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Title: Characterization of the external and internal flow structure of an aerated-liquid injector using X-ray radiography and fluorescence

Abstract

In the present study, the internal flowfield of aerated-liquid fuel injectors is examined through x-ray radiography and x-ray fluorescence. An inside-out injector, consisting of a perforated aerating tube within an annular liquid stream, sprays into a quiescent environment at a fixed mass flow rate of water and nitrogen gas. The liquid is doped with bromine (in the form of NaBr) to create an x-ray fluorescence signal. This allows for reasonable absorption and fluorescence signals, and one or both diagnostics can be used to track the liquid distribution. The injector housing is fabricated from beryllium (Be), which allows the internal flowfield to be examined (as Be has relatively low x-ray attenuation coefficient). Two injector geometries are compared, illustrating the effects of aerating orifice size and location on the flow evolution. Time-averaged equivalent pathlength (EPL) and line-of-sight averaged density ρ(y) reveal the formation of the two-phase mixture, showing that the liquid film thickness along the injector walls is a function of the aerating tube geometry, though only upstream of the nozzle. These differences in gas and liquid distribution (between injectors with different aerating tube designs) are suppressed as the mixture traverses the nozzle contraction. The averaged liquid velocity (computed from the densitymore » and liquid mass flow rate) reveal a similar trend. This suggests that at least for the current configurations, the plume width, liquid mass distribution, and averaged liquid velocity for the time-averaged external spray are insensitive to the aerating tube geometry.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; Air Force Research Laboratory (AFRL) - Aerospace Systems Directorate
OSTI Identifier:
1411173
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Volume: 58; Journal Issue: 9; Journal ID: ISSN 0723-4864
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Peltier, Scott J., Lin, Kuo-Cheng, Carter, Campbell D., and Kastengren, Alan L. Characterization of the external and internal flow structure of an aerated-liquid injector using X-ray radiography and fluorescence. United States: N. p., 2017. Web. doi:10.1007/s00348-017-2380-4.
Peltier, Scott J., Lin, Kuo-Cheng, Carter, Campbell D., & Kastengren, Alan L. Characterization of the external and internal flow structure of an aerated-liquid injector using X-ray radiography and fluorescence. United States. doi:10.1007/s00348-017-2380-4.
Peltier, Scott J., Lin, Kuo-Cheng, Carter, Campbell D., and Kastengren, Alan L. Wed . "Characterization of the external and internal flow structure of an aerated-liquid injector using X-ray radiography and fluorescence". United States. doi:10.1007/s00348-017-2380-4.
@article{osti_1411173,
title = {Characterization of the external and internal flow structure of an aerated-liquid injector using X-ray radiography and fluorescence},
author = {Peltier, Scott J. and Lin, Kuo-Cheng and Carter, Campbell D. and Kastengren, Alan L.},
abstractNote = {In the present study, the internal flowfield of aerated-liquid fuel injectors is examined through x-ray radiography and x-ray fluorescence. An inside-out injector, consisting of a perforated aerating tube within an annular liquid stream, sprays into a quiescent environment at a fixed mass flow rate of water and nitrogen gas. The liquid is doped with bromine (in the form of NaBr) to create an x-ray fluorescence signal. This allows for reasonable absorption and fluorescence signals, and one or both diagnostics can be used to track the liquid distribution. The injector housing is fabricated from beryllium (Be), which allows the internal flowfield to be examined (as Be has relatively low x-ray attenuation coefficient). Two injector geometries are compared, illustrating the effects of aerating orifice size and location on the flow evolution. Time-averaged equivalent pathlength (EPL) and line-of-sight averaged density ρ(y) reveal the formation of the two-phase mixture, showing that the liquid film thickness along the injector walls is a function of the aerating tube geometry, though only upstream of the nozzle. These differences in gas and liquid distribution (between injectors with different aerating tube designs) are suppressed as the mixture traverses the nozzle contraction. The averaged liquid velocity (computed from the density and liquid mass flow rate) reveal a similar trend. This suggests that at least for the current configurations, the plume width, liquid mass distribution, and averaged liquid velocity for the time-averaged external spray are insensitive to the aerating tube geometry.},
doi = {10.1007/s00348-017-2380-4},
journal = {Experiments in Fluids},
issn = {0723-4864},
number = 9,
volume = 58,
place = {United States},
year = {2017},
month = {8}
}

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