Formaldehyde LIF-Diagnostics of the Autoignition of n-Decane Droplet Pairs in Microgravity

Int. J. Microgravity Sci. Appl. 2016p330306
Christian EIGENBROD, Konstantin KLINKOV, Michael PETERS, Guenther MARKS, Wolfgang PAA, Volker WAGNER and Wolfgang TRIEBEL
ZARM, University of Bremen, Am Fallturm, Institute of Photonic Technology
The interaction between two neighboring n-decane droplets during the autoignition process in air was experimentally investigated under microgravity conditions in the drop tower Bremen. The initial droplet diameter was 0.8 mm in all experiments. Single droplets and droplet pairs with a center distance of 1, 2, 4 and 6 mm were investigated. The air temperature was varied between 650 and 850 K with an increment of 25 K. The examined pressure conditions were 0.3 and 0.5 MPa. This results in a total number of 90 drop experiments. The ignition process was observed applying the laser induced fluorescence (LIF) on formaldehyde with high temporal and spatial resolution. Both, the cool flame process and the hot flame ignition could be measured regarding induction times and the temporal and spatial evolution of the formaldehyde formation.
Droplet ignition, Two stage ignition; Laser-diagnostics

Received 21 October 2015, accepted 27 June 2016, published 31 July 2016.

© The Japan Society of Microgravity Applicaiton

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