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Title: Characterization of simulated small-droplet fuel sprays

Abstract

A two-fluid pneumatic atomizer operating at relatively high liquid and gas pressures produced water sprays that simulated small-droplet clouds of liquid fuel for use in studying vaporization and fuel-air mixing effects on combustor performance and emissions. To characterize the sprays, a scattered-light scanning instrument was developed and measurements of volume median or volume mean diameter, D sub V.5, were correlated with D sub O, W sub w, and W sub n, i.e., orifice diameter, water, and nitrogen gas flow rates, respectively, to give the general expression: D sub v.5 approx. (D sub o sup 0.2) (W sub w sup m) (W sub n sup n), which yields D sub v.5 = 45 (D sub o sup 0.2) (W sub w sup 0.2) (W sub w sup - 1.2). Values of D sub o, W sub w, and W sub n are in centimeters and grams/second, respectively. Farther downstream at an axial distance of 6.7 cm, exponent m increased from 0.2 to 0.4 and exponent n decreased from -1.2 to -1.0 and at a distance of 25 cm downstream of the atomizer, n decreased to -0.8. The increase in exponent m and decrease in exponent n was attributed to a lossmore » of very small droplets from the spray due primarily to vaporization and diffusion effects on clouds of small droplets traveling a distance of 25 cm.« less

Authors:
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
OSTI Identifier:
5390423
Report Number(s):
N-86-24961; NASA-TM-87286; E-2987; CONF-8606184-1
Resource Type:
Conference
Resource Relation:
Conference: 22. joint propulsion conference, Huntsville, AL, USA, 16 Jun 1986
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; LIQUID FUELS; FUEL-AIR RATIO; SPRAYS; COMBUSTION CHAMBERS; DROPLETS; EVALUATION; EVAPORATION; EXPERIMENTAL DATA; FUEL SYSTEMS; MIXING; NUMERICAL SOLUTION; PARTICLE SIZE; SIMULATION; DATA; FUELS; INFORMATION; NUMERICAL DATA; PARTICLES; PHASE TRANSFORMATIONS; SIZE; 400800* - Combustion, Pyrolysis, & High-Temperature Chemistry; 421000 - Engineering- Combustion Systems

Citation Formats

Ingebo, R D. Characterization of simulated small-droplet fuel sprays. United States: N. p., 1986. Web.
Ingebo, R D. Characterization of simulated small-droplet fuel sprays. United States.
Ingebo, R D. 1986. "Characterization of simulated small-droplet fuel sprays". United States.
@article{osti_5390423,
title = {Characterization of simulated small-droplet fuel sprays},
author = {Ingebo, R D},
abstractNote = {A two-fluid pneumatic atomizer operating at relatively high liquid and gas pressures produced water sprays that simulated small-droplet clouds of liquid fuel for use in studying vaporization and fuel-air mixing effects on combustor performance and emissions. To characterize the sprays, a scattered-light scanning instrument was developed and measurements of volume median or volume mean diameter, D sub V.5, were correlated with D sub O, W sub w, and W sub n, i.e., orifice diameter, water, and nitrogen gas flow rates, respectively, to give the general expression: D sub v.5 approx. (D sub o sup 0.2) (W sub w sup m) (W sub n sup n), which yields D sub v.5 = 45 (D sub o sup 0.2) (W sub w sup 0.2) (W sub w sup - 1.2). Values of D sub o, W sub w, and W sub n are in centimeters and grams/second, respectively. Farther downstream at an axial distance of 6.7 cm, exponent m increased from 0.2 to 0.4 and exponent n decreased from -1.2 to -1.0 and at a distance of 25 cm downstream of the atomizer, n decreased to -0.8. The increase in exponent m and decrease in exponent n was attributed to a loss of very small droplets from the spray due primarily to vaporization and diffusion effects on clouds of small droplets traveling a distance of 25 cm.},
doi = {},
url = {https://www.osti.gov/biblio/5390423}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}

Conference:
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