Antimisting Fuel Breakup and Flammability.
Final rept. Aug 81-1982,
JET PROPULSION LAB PASADENA CA
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The breakup behavior and flammability of antimisting turbine fuels subjected to aerodynamic shear are investigated in this report. Fuels tested were Jet A containing 0.3 FM-9 polymer developed by ICI Americas at various levels of degradation ranging from virgin AMK to neat Jet A. The misting behavior of the fuels was quantified by droplet size distribution measurements. A new technique based on high resolution laser photography and digital image processing of photographic records for rapid determination of droplet size distribution was developed for this purpose. The flammability of flowing droplet-air mixtures was quantified by direct measurements of temperature rise in a flame established in the wake of a continuous ignition source. The temperature rise measurements were correlated with droplet size measurements. The flame anchoring phenomena associated with the breakup of a liquid fuel in the wake of a bluff body was shown to be important in the context of a survivable crash scenario. A new passfail criterion for flammability testing of antimisting fuels, based on this flame-anchoring phenomena, was proposed. The role of various ignition sources and their intensity in ignition and post-ignition behavior of antimisting fuels was also investigated. Finally, the rate of flame spread on the surface of a pool of Jet A and AMK fuels was investigated for various depths of fuel layer at ambient temperature conditions.