Effects of inert evaporating droplets on turbulent combustion

Xia, J. and Luo, Kai H. (2008) Effects of inert evaporating droplets on turbulent combustion. DNS and LES of Reacting Flows (dnsles2008), Eindhoven, Netherlands. 21 - 23 Oct 2008. (Submitted)

Abstract

DNS databases of turbulent reacting mixing layers laden with/without evaporating inert droplets are used to obtain
the statistics for conditional moment closure (CMC) and assess the droplet effects. The temporally developing mixing
layer has an initial Reynolds number of 1000 based on the vorticity thickness with more than 16 million Lagrangian
droplets traced.

Conditional quantities such as singly-conditioned gas temperature hTg|?i, conditional variance of gastemperature hT??2g |?i and conditional co-variance between the mass fraction of fuel and gas temperature hY
??f T??g |?i show the considerable droplet effects on such statistics. Comparison between the droplet-free and droplet-laden reacting mixing layer cases suggests that the first-order singly-conditioned CMC is sufficiently accurate for the former, while for the latter, more advanced CMC approaches such as doubly-conditioned or second-order CMCs become necessary due to extinction induced by droplets. The scalar dissipation rate doubly conditioned on the mixture fraction and normalized gas temperature h?|?, ?i exemplifies the differences between the droplet-free and droplet cases.

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