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.

Issue Section:
Gas Turbines: Combustion, Fuels, and Emissions
Keywords:
bubbles, flow visualisation, heat transfer, jets
Topics:
Fuels, Sprays, Temperature, Superheating, Shear (Mechanics), Bubbles
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 by American Society of Mechanical Engineers
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