10. Optical methods for micro and nanoflows investigations

V.D. Kobtsev, D.N.Kozlov, S.A. Kostritsa, F.V.Plevako, V.V. Smirnov, A.M. Starik, O.M. Stelmakh, A.A. Tumanov
P.I. Baranov Central Institute of Aviation Motors, A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, A.V. Luikov Institute of Heat and Mass Transfer of the National Academy of Sciences,

CARS diagnostics of decane with admixed nanoparticles of Al

The presented work is a part of the general research aimed to develop methods of flame diagnostics in combustion of composite fuels. As an example, the two-component fuel consisting of n-decane (as a model of aviation kerosene) with admixed 20 nm Al nanoparticles has been chosen for our test measurements. The main objective of the presented study was to obtain information on two-dimensional distributions of local temperature values in the flame. These measurements allow to directly characterize the differences in spatial structure of heat release in various zones of the flame while burning either decane or decane with admixed Al nanoparticles.
To measure gas temperatures the broadband CARS approach, with the registration of the molecular nitrogen Q-branch rovibrational transitions, has been used.
It is experimentally established that addition of a small amount of Al nanoparticles (2.5 % weight) to hydrocarbon fuel (namely, decane as a model of aviation kerosene), promotes faster release of heat and increase of flame temperature at the same distances from the nozzle. Hence, the characteristics of combustion of these fuels are considerably different.
Full text paper