TECHNICAL PAPERS: Gas Turbines: Combustion and Fuels

Fuel Droplet Evaporation in a Supercritical Environment

[+] Author and Article Information
G. S. Zhu, S. K. Aggarwal

Department of Mechanical Engineering, University of Illinois at Chicago, Mail Code 251, Chicago, IL 60607-7022

J. Eng. Gas Turbines Power 124(4), 762-770 (Sep 24, 2002) (9 pages) doi:10.1115/1.1385198 History: Received March 01, 1999; Revised August 01, 2000; Online September 24, 2002
Copyright © 2002 by ASME
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Mole fraction of n-heptane predicted by PR, SRK, and RK-EOS for an n-heptane-nitrogen system in thermodynamic equilibrium at four different pressures. Pr is the reduced pressure normalized by the critical pressure of pure n-heptane. The experimental data from Chung et al. 23, for Pr=2.5 and 5.0, are also included in the plots.
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(a) Phase equilibrium in terms of the pressure-temperature diagram and (b) latent heat of vaporization of n-heptane versus temperature for n-heptane-nitrogen system in thermodynamic equilibrium, as predicted by PR, SRK, and RK-EOS at three different pressures. See Fig. 1 for additional details.
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Non-dimensional droplet lifetime, predicted by PR, SRK, and RK-EOS, plotted versus pressure at three different ambient temperatures
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Final temperature and fuel vapor mass fraction at the droplet surface plotted as functions of pressure. The ambient temperature (Ta) is 1000 K, and initial droplet temperature (To) 300 K. The final time corresponds to a time when (d/do)2=0.2.
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(a) Comparison between the predictions using PR, SRK, and RK-EOS and the measured data of Nomura et al. 21 at P=5 atm and Ta=655 K. (b) comparison between the predictions using PR, SRK, and RK-EOS and the measured data of Nomura et al. 21 at P=50 atm and Ta=453 K.
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Supercritical vaporization behavior in terms of the temporal variation of nondimensional droplet surface area, surface temperature and liquid temperature at the droplet center as predicted by PR-EOS
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Radial distribution of liquid temperature (a) and dissolved nitrogen (b) in the droplet interior at different stage of droplet lifetime, as predicted by PR-EOS. The number for each curve represents a fraction of droplet lifetime.
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Radial distribution of gas temperature, velocity, and fuel vapor mass fraction in the gas-phase region as predicted by PR-EOS for ambient pressures of 5 and 150 atm
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Minimum pressure, required for an n-heptane fuel droplet to attain a critical mixing state, plotted as a function of ambient temperature




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