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Thefocusofthepresentstudyisonthepulsatingflamespreadoverasmal1aboratory-scaleopen polofn-butano.l Thisisoffundamentalimportanceindetermining'themechanismbywhich heatis仕組sferedtotheunburnedliquidaheadofthefl制限. Ourefortistoimprovethecurent understandingofthetwiningflowthatwasfirstreportedbyRoseta.1attheNASALewis ResearchCenter'[12]企omth位 ln丘町edimaging(IR)measurementdataonthefuel-surface tempera:旬re. InthatdatatheIRimagesrevealedthatthepreheateddistanceaheadoftheflame wasmuchlongerinmicrogravitythaninnormalgravitywherenotwins仕ucturewasobserved.
EXPERIMENTALMETHODS
Aschematicilustrationoftheexperimentalap訂 atusandse加.pfortheLSPTtechniqueusedin thisstudyisthesameasourpreviousstudies[1-2]andisshowninFigure1. Pyrexfueltrays usedhavethre edif ferentwidth(5，10，20mm)，eachhaving20m mindepthx30 0m minlength. Theinitial白 eltemperaturewasmeasuredbyplacingathermocoupleatthecenterofthetraya fewmmbelowtheliquidsurface. Thex-axiswasfixedalongthefuelsurface，they-axiswas 五xedalongtheverticaldirection，andthez-axiswasnormaltox-yplane. Theflame'sleading edgewasmovingwiththeoriginalongthecenterlineofthetrayonthefuelsurface(seFigure
1c).
FIGURE1(a)Aschematicilus仕ationoftheLSPTsetup.
A smal lglas swoolwickwasplacedatoneoftheendsandignitedbyasmal lpilotflame;within afewsecondsflamestartedtospreadovertheliquid.， Tbisignitionmethodgaveilsgood
