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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Characterization of Fuel Composition Effects in H2COCH4 Mixtures Upon Lean Blowout

[+] Author and Article Information
Qingguo Zhang, David R. Noble, Tim Lieuwen

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150

J. Eng. Gas Turbines Power 129(3), 688-694 (Dec 26, 2006) (7 pages) doi:10.1115/1.2718566 History: Received August 15, 2006; Revised December 26, 2006

This paper describes measurements of the dependence of lean blowout limits upon fuel composition for H2COCH4 mixtures. Blowout limits were obtained at fixed approach flow velocity, reactant temperature, and combustor pressure at several conditions. Consistent with prior studies, these results indicate that the percentage of H2 in the fuel dominates the mixture blowout characteristics. That is, flames can be stabilized at lower equivalence ratios, adiabatic flame temperatures, and laminar flame speeds with increasing H2 percentage. In addition, the blowoff phenomenology qualitatively changes with hydrogen levels in the fuel, being very different for mixtures with H2 levels above and below about 50%. It is shown that standard well stirred reactor based correlations, based upon a Damköhler number with a diffusivity ratio correction, can capture the effects of fuel composition variability on blowoff limits.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Relationship between chemical time calculated using Eq. 1 and blowout residence time for ϕ=0.6H2∕CO∕CH4 mixtures. Results obtained using CHEMKIN with the GRI 3.0 mechanism.

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Figure 2

Cross section of premixer assembly

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Figure 3

Composition map describing regions where sharply defined blowoff event occurs (gray) and blowoff preceded by significant flame liftoff (white)

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Figure 4

Dependence of flame speed (cm/s) upon fuel composition at fixed 1500K (left) and 2000K (right) adiabatic flame temperatures with 300K reactant temperature

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Figure 5

Dependence of adiabatic flame temperature (K) upon fuel composition at fixed laminar flame speed 10cm∕s (left) and 20cm∕s (right) with 300K reactant temperature

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Figure 6

Dependence of chemical time (ms) upon fuel composition at fixed adiabatic flame temperature, 1500K

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Figure 7

Primary color mixing scheme used to denote fuel blend composition

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Figure 8

Dependence of LBO equivalence ratio upon H2 mole fraction at premixer flow velocities of 59m∕s at 300K reactants temperature and 1.7atm combustor pressure (circle) and 458K and 4.4atm (diamond)

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Figure 9

Damköhler numbers of mixtures at constant premixer flow speed of 59m∕s at 300K reactants temperature and 1.7atm combustor pressure

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Figure 10

Damköhler numbers of mixtures based on adjusted equivalence ratio at premixer flow velocities of 59m∕s at 458K reactants temperature and 4.4atm combustor pressure

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Figure 11

Comparison of predicted and measured blowoff equivalence ratio for all T=300K, p=1.7atm data. circle: U0=59m∕s, square: U0=39m∕s

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