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

Characterization of a Superheated Fuel Jet in a Crossflow

[+] Author and Article Information
May L. Corn, Jeffrey M. Cohen, Jerry C. Lee, Donald J. Hautman

 United Technologies Research Center, East Hartford, CT 06108

Scott M. Thawley, Christopher T. Brown, Vincent G. McDonell

 Energy Research Consultants, Laguna Hills, CA 92653

J. Eng. Gas Turbines Power 133(1), 011501 (Sep 13, 2010) (7 pages) doi:10.1115/1.4001978 History: Received December 28, 2009; Revised December 29, 2009; Published September 13, 2010; Online September 13, 2010

An experiment was conducted to characterize a superheated fuel jet (Jet-A) injected into an unheated crossflow of air. The liquid phase of the fuel jet was characterized with high speed imaging and phase Doppler interferometry. The transition from a shear-atomized to a flash-atomized spray at a fuel temperature of 513 K (465°F) was observed at an ambient pressure of 1 atm, which is consistent with the bubble and dew point curves predicted for JP-8. The explosive breakup that was seen in the flash-atomized spray produced submicron droplets with a high radial momentum. This unique behavior makes superheated fuels an attractive design feature for fuel preparation devices that can employ flash boiling to enhance fuel atomization and mixing in a compact volume.

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References

Figures

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Figure 1

Scenario for employing superheated fuel injection in a gas turbine combustor, as illustrated on the bubble and vapor curves for JP-8 from Ref. 11

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Figure 2

Liquid jet-in-crossflow facility

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Figure 3

Plain orifice injector (exit orifice diameter of 0.508 mm (0.020 in.)) used in the experiment

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Figure 4

Staged heating system used to heat jet fuel to 555 K (600°F)

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Figure 5

Single-frame images depict three different spray regimes as the fuel temperature is increased. Images in rows 1 and 2 are 22.2×22.2 mm2(0.87×0.87 in.2); image shown in row 3 is 16.1×21.5 mm2(0.63×0.85 in.2).

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Figure 6

Observed shear-atomized, transition, and flash-atomized fuel spray behaviors relative to the bubble and dew point curves for JP-8 (11)

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Figure 7

Upper spray penetration curves from time-averaged images for shear-atomized and flash-atomized sprays

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Figure 8

Comparison between the trajectories predicted by kerosene (6) and water (13) jet-in-crossflow correlations with the results for cases 1 and 6 (296 K (74°F) and 550 K (530°F))

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Figure 9

Droplet SMD, droplet axial velocity, and liquid volume flux profiles for the 309 K (97°F) and 505 K (450°F) fuel jets in the shear-atomized regime

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Figure 10

Data rates for different droplet size classes measured for the 309 K (97°F) and 505 K (450°F) fuel jets in the shear-atomized regime at x/d=50

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