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Fuel Combustion

Measurement of Laminar Burning Speeds and Determination of Onset of Auto-Ignition of Jet-A/Air and Jet Propellant-8/Air Mixtures in a Constant Volume Spherical Chamber

[+] Author and Article Information
Ali Moghaddas, Casey Bennett, Hameed Metghalchi

Department of Mechanical and Industrial Engineering,  Northeastern University, Boston, MA 02115

Kian Eisazadeh-Far

Department of Aerospace and Mechanical Engineering,  University of Southern California, Los Angeles, CA 90089

J. Energy Resour. Technol 134(2), 022205 (Apr 26, 2012) (6 pages) doi:10.1115/1.4006480 History: Received November 14, 2011; Revised March 22, 2012; Published April 26, 2012; Online April 26, 2012

The laminar burning speeds of Jet-A/air and three different samples of jet propellant (JP-8)/air mixtures have been measured and the onset of auto-ignition in JP-8/air premixed mixtures has been determined. The experiments were made in a constant volume spherical vessel, which can withstand high pressures up to 400 atm. Burning speed was calculated from dynamic pressure rise due to the combustion process in the vessel. A thermodynamic model based on the pressure rise was used to determine the burning speed. The burning speeds were measured in lean mixtures for pressures of 1–4.5 atm and temperatures of 493–700 K. The onset of auto-ignition of JP-8 fuels was evaluated by observing intense fluctuations of pressure data during the explosion of the unburned gas. It was revealed that Jet-A and JP-8 have very similar burning speeds; however, auto-ignition temperatures of various samples of JP-8 were slightly different from each other. Auto-ignition of these fuels was much more sensitive to temperature rather than pressure.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of the spherical vessel

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Figure 2

Schematic diagram of experimental facilities

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Figure 3

Schematic of different zones and their corresponding temperatures in the thermodynamic model

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Figure 4

Laminar burning speeds of Jet-A (4658) initially at 493 K and 1 atm

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Figure 5

Laminar burning speeds of JP-8 (3773) and (4177) initially at 493 K and 1 atm

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Figure 6

Comparison of laminar burning speeds of different JP-8 and Jet-A initially at 493 K and 1 atm

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Figure 7

Pressure–time record of auto-ignition of stoichiometric mixture of JP-8 (3773) initially at 479 K and 8 atm

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Figure 8

Rate of pressure rise (dP/dt) for auto-ignition of stoichiometric mixture of JP-8 (3773) initially at 479 K and 8 atm

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Figure 9

Comparison of pressure–time record of auto-ignition of JP-8 (3773) initially at 479 K and 8 atm at three different equivalence ratios

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Figure 10

Comparison of pressure–time record of auto-ignition of JP-8 (4177) initially at 480 K and 8 atm at three different equivalence ratios

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Figure 11

Auto-ignition temperatures versus pressures for JP-8/air mixtures

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