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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

An Experimental Ignition Delay Study of Alkane Mixtures in Turbulent Flows at Elevated Pressures and Intermediate Temperatures

[+] Author and Article Information
David Beerer, Scott Samuelsen

 UC Irvine Combustion Laboratory, Irvine, CA 92697-3550

Vincent McDonell1

 UC Irvine Combustion Laboratory, Irvine, CA 92697-3550mcdonell@ucicl.uci.edu

Leonard Angello

 Electric Power Research Institute, Palo Alto, CA 94304-1395

1

Corresponding author.

J. Eng. Gas Turbines Power 133(1), 011502 (Sep 13, 2010) (8 pages) doi:10.1115/1.4001981 History: Received April 07, 2010; Revised April 30, 2010; Published September 13, 2010; Online September 13, 2010

Autoignition delay times of mixtures of alkanes and natural gas were studied experimentally in a high pressure and intermediate temperature turbulent flow reactor. Measurements were made at pressures between 7 atm and 15 atm and temperatures from 785 K to 935 K. The blends include binary and ternary mixtures of methane, ethane, and propane along with various natural gas blends. Based on these data, the effect of higher hydrocarbons on the ignition delay time of natural gas type fuels at actual gas turbine engine conditions has been quantified. While the addition of higher hydrocarbons in quantities of up to 30% was found to reduce the ignition delay by up to a factor of 4, the delay times were still found to be greater than 60 ms in all cases, which is well above the residence times of most engine premixers. The data were used to develop simple Arrhenius type correlations as a function of temperature, pressure, and fuel composition for design use.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a lean premixed combustor

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Figure 2

UC Irvine Combustion Laboratory flow reactor

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Figure 3

Fuel detection laser setup

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Figure 4

Laser and PMT recording from one ignition delay test (methane/propane, 90/10 blend, Tmix=862 K, P=9.0 atm, ϕ∼0.6, and τ=252 ms)

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Figure 5

Ignition delay times of methane, ethane, and propane at 9 atm and ϕ∼0.6

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Figure 6

Ignition delay of binary blends of methane and ethane

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Figure 7

Ignition delay of binary blends of methane and propane

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Figure 8

Ignition delay times of mixtures of 70% methane with 30% higher hydrocarbons

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Figure 9

Ignition delay of natural gas with respect to other fuels

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Figure 10

Pressure effect on ignition delay of the 70/15/15 methane/ethane/propane fuel blend

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Figure 11

Interpolation of the activation energy, E, of binary methane/ethane and methane/propane blends as a function of ethane or propane fraction in the fuel

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Figure 12

Interpolation of the pre-exponential factor, A, of binary methane/ethane and methane/propane blends as a function of ethane or propane fraction in the fuel

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Figure 13

Computer ignition delay trends using the correlations from this study and Holton for alkanes at 9 atm and ϕ=0.6

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Figure 14

Caculated ignition delay times from the test fuels in this study versus their methane number

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